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DPL-1040-NPN-NC 6m Multi-Pitch Safety Light Curtain industrial area sensor
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DPL-1040-NPN-NC Compact Safety Light Curtain is a 10-beam compact safety light curtain with 40 mm optical axis pitch and 360 mm protection height. Separate emitter and receiver units, 35 × 28 mm aluminium alloy housing, 422 mm total height, 45 mm resolution, NPN NC output, <5 ms response time, IP65 protection, 0.1–6 m detection distance, ideal for automation equipment and small to medium-sized machinery.
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✦ Compact Safety Light Curtain
NPN Output
NC Logic
IP65
DPL-1040-NPN-NC
Compact Safety Light Curtain for Automation Equipment · 10-Beam · 40 mm Pitch · 360 mm Protection Height
The DAPPRA DPL-1040-NPN-NC is a ten-beam Compact Safety Light Curtain designed for inspection and protection on automation equipment and small to medium-sized machinery.
It uses separate EMITTER and RECEIVER units to provide a 360 mm protection height, with a compact 35 × 28 mm aluminium alloy housing, an NPN Normally Closed output and a <5 ms response time.
The NPN NC output switches the signal line to 0 V when a beam is interrupted, interfacing directly with PLC and controller inputs configured for NPN (sinking) operation at DC 24 V ± 20 %. The standard detection distance is 0.1–6 m.
Primary Product Classification: Compact Safety Light Curtain.
Related Industry Terminology: Safety Light Curtain / Industrial Area Sensor / Machine Guarding.
Product Overview
DAPPRA DPL-1040-NPN-NC is a ten-beam Compact Safety Light Curtain designed for inspection and protection on automation equipment and small to medium-sized machinery. It uses separate EMITTER and RECEIVER units to provide a 360 mm protection height, with a 35 × 28 mm aluminium alloy housing, NPN NC output and a <5 ms response time.
The DPL Series uses Multiple Parallel Beam Through-Beam Detection Technology and adopts line synchronization between the emitter and receiver for reliable optical-beam operation. It provides 5 / 10 / 20 / 40 mm optical-axis pitches for high-precision inspection through to large-area guarding.
The DPL-1040-NPN-NC is suitable for machine protection, personnel protection, machine area detection, object detection, assembly stations and general industrial automation applications.
DPL-1040-NPN-NC Key Features
- 10 Optical Beams · 40 mm Optical-Axis Pitch
- 360 mm Protection Height
- 422 mm Total Height
- Resolution 45 mm
- NPN Transistor Output · Normally Closed (NC) Logic
- 0.1–6 m Standard Detection Distance
- <5 ms Response Time
- Compact 35 × 28 mm Aluminium Alloy Housing
- DC 24 V ± 20 % Operating Voltage
- ≤200 mA Output Current · <5 W Power Consumption
- IP65 Protection Rating
- Line Synchronization
- Dual-Circuit Self-Checking Output Design
- Integrated Protection Circuitry
- Top & Bottom / Side / Cantilever / Integrated Steel Tube Mounting Options
NPN Output Design with Normally Closed Logic
The DPL-1040-NPN-NC adopts an NPN transistor output with Normally Closed (NC) logic. The output switches the signal line to 0 V (GND) when the optical beam is interrupted, matching PLC and controller inputs configured for NPN (sinking) input.
With NC logic, the output is closed during normal operation and opens when a beam is interrupted — a configuration commonly used for machine stop circuits, where an interrupted beam or a loss of power results in a safe output state.
The product uses a 35 × 28 mm aluminium alloy housing with a dual-circuit self-checking output design and integrated protection circuitry (power over-voltage protection, reverse-polarity protection, output over-current protection), supporting stable operation in electrically noisy industrial environments.
The DPL Series focuses on achieving a balance between compact housing size, detection accuracy and machine protection.
Product Specifications
| Parameter | DPL-1040-NPN-NC |
|---|---|
| Product Series | DPL Series |
| Product Type | Compact Safety Light Curtain |
| SKU | OL15 |
| Optical Beam Quantity | 10 Beams |
| Optical-Axis Pitch | 40 mm |
| Protection Height | 360 mm |
| Total Height | 422 mm |
| Resolution | 45 mm |
| Housing Cross Section | 35 × 28 mm (Aluminium Alloy) |
| Response Time | <5 ms |
| Detection Distance | 0.1–6 m (Standard) |
| Operating Voltage | DC 24 V ± 20 % |
| Output Type | NPN Transistor Output |
| Output Logic | NC (Normally Closed) |
| Output Current | ≤200 mA |
| Power Consumption | <5 W |
| Protection Circuitry | Power over-voltage / reverse-polarity / output over-current |
| Self-Checking | Dual-circuit self-checking output design |
| Synchronization | Line Synchronization |
| Insulation Resistance | ≥100 MΩ |
| Dielectric Strength | AC 1500 V, 60 s — no breakdown or flashover |
| Protection Rating | IP65 |
| Operating Temperature | −10 ~ +55 °C |
| Operating Humidity | <85 % RH at 20 °C |
| Light Interference Resistance | 10,000 Lux (incident angle > 5°) |
| Mounting | Top & Bottom / Side / Cantilever / Integrated Steel Tube |
Optical Detection Structure
The DPL-1040-NPN-NC uses separate EMITTER and RECEIVER units to create a parallel infrared detection field.
The 10 optical beams are arranged with a 40 mm optical-axis pitch, providing a 360 mm protection height with 45 mm resolution.
EMITTER → Parallel Infrared Beams → RECEIVER → NPN OUTPUT (NC Logic)
When an object or person interrupts the infrared beam path, the receiver detects the change in the optical field and switches the corresponding NPN NC output to control the machine stop circuit via the connected PLC or controller.
Area Sensor vs Safety Light Curtain
The terms Area Sensor and Safety Light Curtain are commonly used in industrial automation to describe multi-beam photoelectric detection products, but they may represent different technical and safety requirements depending on the application.
An Industrial Area Sensor is generally used for multi-beam detection of personnel, objects, access areas and machine processes.
A Safety Light Curtain is typically associated with machine protection and applications where specific functional-safety requirements and applicable safety standards need to be considered.
The DPL-1040-NPN-NC is designed as a Compact Safety Light Curtain for inspection and protection on automation equipment, using an NPN Normally Closed output for integration with PLC and controller inputs. The appropriate safety configuration and integration should be determined according to the machine risk assessment and applicable safety requirements.
Compact Safety Light Curtain for Automation Equipment
Fast <5 ms Response
With a response time of <5 ms, the DPL-1040-NPN-NC provides fast detection for machinery safety applications, supporting rapid response to objects or personnel entering or passing through the sensing area.
Combined with line synchronization between the emitter and receiver and the dual-circuit self-checking output design, the DPL Series supports reliable machine protection in industrial environments.
IP65 Protection for Industrial Environments
The DPL-1040-NPN-NC features an IP65 protection rating with an aluminium alloy housing, making it suitable for industrial automation environments where protection against dust and water jets is required.
The operating temperature range is −10 ~ +55 °C with an operating humidity of <85 % RH at 20 °C, and light interference resistance of 10,000 Lux (incident angle > 5°).
NPN Normally Closed Output
The DPL-1040-NPN-NC uses an NPN transistor output with Normally Closed (NC) logic. The output switches the signal line to 0 V (GND) when the optical beam is interrupted, and interfaces directly with PLC and controller inputs configured for NPN (sinking) operation.
The output is rated for ≤200 mA output current, with an operating voltage of DC 24 V ± 20 % and power consumption of <5 W.
DPL-1040-NPN-NC Model Information
The model number identifies the DPL Series configuration, beam quantity, optical-axis pitch, output type and output logic.
Model Code
DPL
-
10
40
-
NPN
-
NC
DPL
Series prefix — DAPPRA DPL Series Compact Safety Light Curtain.
10 — Beam Quantity
Number of optical beams. This model uses 10 optical beams.
40 — Optical-Axis Pitch
Optical-axis pitch in mm. This model uses 40 mm beam spacing.
NPN — Output Type
NPN transistor output. The output switches the signal line to 0 V when a beam is interrupted.
NC — Output Logic
NC = Normally Closed; NO = Normally Open.
Field
Meaning
Value
DPL
Series prefix
DPL
Beam Quantity
Number of optical beams
10
Optical-Axis Pitch
Distance between adjacent optical axes
40 mm
Output Type
Transistor output configuration
NPN
Output Logic
Signal logic state
NC (Normally Closed)
Example: DPL-1040-NPN-NC = DPL Series, 10 beams, 40 mm optical-axis pitch, NPN output, Normally Closed logic.
Dimensions
The DPL-1040-NPN-NC features a 35 × 28 mm aluminium alloy housing with a 360 mm protection height and 422 mm total height.
Key dimensions:
- Housing Cross Section: 35 × 28 mm
- Optical-Axis Pitch: 40 mm
- Protection Height: 360 mm
- Total Height: 422 mm
- Resolution: 45 mm
Installation Method
The DPL Series supports multiple mounting configurations for different machinery structures. Standard top & bottom mounting brackets are included, with side mounting brackets, cantilever brackets and integrated steel tube brackets available as options.
The 35 × 28 mm aluminium alloy housing provides a stable mounting base while maintaining the compact cross-section required for space-restricted automation equipment.
The EMITTER and RECEIVER should be securely installed and accurately aligned to ensure reliable infrared detection.
- Top & Bottom Mounting Brackets — Standard mounting with side-fixing brackets, M3 screws, washers and spring washers
- Side Mounting Brackets — Lateral fixing with M6 long / short screws, spring washers, flat washers, nuts and sliding blocks
- Cantilever Brackets — Extended mounting positions with rotary arm and cantilever support rod
- Integrated Steel Tube Brackets — Floor-standing or free-standing guarding with φ27 tubes and brackets
DPL Series Model Selection
The DPL Series provides different beam quantities, optical-axis pitches and protection heights for different inspection and protection requirements.
For the DPL-1040-NPN-NC:
DPL-1040-NPN-NC → 10 Beams · 40 mm Optical-Axis Pitch · 360 mm Protection Height · 422 mm Total Height · NPN NC Output
For the complete DPL Series model selection table, including different beam quantities, optical-axis pitches, protection heights and output options, please visit the DPL Series page. [VIEW DPL SERIES MODEL SELECTION →]
Wiring & NPN Output
The DPL-1040-NPN-NC uses an NPN transistor output at DC 24 V ± 20 %. The receiver provides a sync port and an output port for connection to the PLC or machine control circuit. The NPN NC output switches the signal line to 0 V when a beam is interrupted.
Before connection, verify the output type (NPN / PNP) and output logic (NC / NO) of the selected model and the input configuration of the machine control system.
| Electrical Configuration | Specification |
|---|---|
| Operating Voltage | DC 24 V ± 20 % |
| Output Type | NPN Transistor Output |
| Output Logic | NC (Normally Closed) |
| Output Current | ≤200 mA |
| Power Consumption | <5 W |
| Synchronization | Line Synchronization |
| Control Interface | Direct connection to PLC or controller NPN (sinking) input |
Wire Colour Reference
| Port | Function | Wire Colour |
|---|---|---|
| Emitter | +24 VDC | Brown (BN) |
| Emitter | 0 V | Blue (BU) |
| Emitter | Sync CP | Black (BK) |
| Receiver | +24 VDC | Brown (BN) |
| Receiver | 0 V | Blue (BU) |
| Receiver | Sync CP | Black (BK) |
| Receiver | Signal Output (NPN NC) | White (WH) |
Controller Options
The DPL Series can be integrated with dedicated controllers for different machine installation and control requirements.
Two controller configurations are available:
Built-in Controller
DAPPRA DSC-E220
DAPPRA DSC-E220 is a built-in controller designed for installation inside the machine cabinet. It provides power and control functions for compatible Safety Light Curtain and Industrial Area Sensor systems.
View DSC-E220 Built-in Controller →External Controller
DAPPRA DSC-G220
DAPPRA DSC-G220 is an external controller designed for use with compatible Safety Light Curtain and Industrial Area Sensor systems. It provides an external control interface for machine integration and control applications.
View DSC-G220 External Controller →One controller can manage multiple DPL sensor sets, forming multi-face protection such as one-to-two or one-to-three configurations for larger press machines.
Applications
Machine and Personnel Applications
- Machine Protection
- Personnel Protection
- Machine Area Detection
- Object Detection
- Assembly Stations
- Material Presence Checking
Equipment and Machinery Applications
- Automation Equipment
- Small & Medium Machinery
- Packaging Machinery
- Cutting Equipment
- Robotic Equipment
- Large-Area Guarding
FAQ
Common questions about the DPL-1040-NPN-NC compact safety light curtain — model selection, output logic, installation, wiring and troubleshooting.
What is the DAPPRA DPL-1040-NPN-NC?
+
The DAPPRA DPL-1040-NPN-NC is a compact Safety Light Curtain in the DPL Series. It uses 10 optical beams with a 40 mm optical-axis pitch, providing a 360 mm protection height and a 422 mm total height. It has an NPN transistor output with Normally Closed (NC) logic, a 0.1–6 m standard detection distance, a <5 ms response time and an IP65 protection rating.
What is the difference between a Safety Light Curtain and an Area Sensor?
+
An Area Sensor is generally used for multi-beam detection of personnel, objects, access areas and machine processes. A Safety Light Curtain is typically associated with machine protection and applications where specific functional-safety requirements and applicable safety standards need to be considered.
The DPL-1040-NPN-NC is designed as a Compact Safety Light Curtain for inspection and protection on automation equipment, using an NPN Normally Closed output for integration with PLC and controller inputs.
What safety light curtain or area sensor do I need for my machine?
+
The required model depends on the protection height, the smallest object or body part that must be detected, the detection distance, and the output type required by the machine control system.
For larger openings and large-area guarding, the DPL-1040-NPN-NC with 10 beams at 40 mm pitch provides a 360 mm protection height. For smaller objects or finger protection, choose a DPL Series model with a smaller pitch such as 5 mm, 10 mm or 20 mm.
How many beams should I choose for a safety light curtain or area sensor?
+
The required beam quantity depends on the protection height and the optical-axis pitch. Protection height is calculated as (Beam Quantity − 1) × Optical-Axis Pitch.
The DPL-1040-NPN-NC uses 10 beams at a 40 mm pitch, giving a 360 mm protection height — suitable for larger openings and large-area guarding on automation equipment.
What beam spacing or resolution should I choose?
+
Beam spacing (optical-axis pitch) determines the resolution. Smaller pitches provide higher resolution for small-object detection, while larger pitches cover larger areas with fewer beams.
The DPL-1040-NPN-NC uses a 40 mm optical-axis pitch with 45 mm resolution, suitable for large-area guarding, object detection and machine area detection.
What is the difference between 10 mm, 20 mm, 30 mm and 40 mm resolution or beam spacing?
+
Resolution is determined by the optical-axis pitch. A 5 mm pitch gives 10 mm resolution for small-object detection; a 10 mm pitch gives 15 mm resolution; a 20 mm pitch gives 25 mm resolution; and a 40 mm pitch gives 45 mm resolution for large-area guarding.
The DPL-1040-NPN-NC uses a 40 mm pitch with 45 mm resolution — suitable for body detection, large-area guarding and object detection where very small objects are not the target.
How do I choose the correct sensing distance?
+
Choose a sensing distance that is greater than the physical distance between the emitter and receiver, with some margin for alignment and installation tolerances.
The DPL-1040-NPN-NC supports a standard detection distance of 0.1–6 m, suitable for most automation equipment and machine guarding layouts.
Can a safety light curtain be used for a press machine?
+
Yes. Safety light curtains are commonly used on press machines to protect operators from the hazardous area. The light curtain monitors the access opening and stops the machine when a hand or body part enters the hazardous zone.
The DPL-1040-NPN-NC's NPN NC output simplifies connection to the press machine's control circuit. Safety distance and protection height should be determined according to the machine risk assessment and applicable safety standards.
Can an area sensor be used for object counting?
+
Yes. Area sensors can be used for object counting on conveyors and production lines by detecting each object as it interrupts one or more beams.
The DPL-1040-NPN-NC provides an NPN NC output that can be connected to a PLC or counter input. With 40 mm pitch and 45 mm resolution, it is suitable for counting medium to large objects.
How does a safety light curtain or area sensor detect objects?
+
The DPL-1040-NPN-NC uses separate EMITTER and RECEIVER units to create a parallel infrared detection field. When an object or person interrupts the infrared beam path, the receiver detects the change in the optical field and switches the corresponding output.
The 10 optical beams are arranged with a 40 mm optical-axis pitch, providing a 360 mm protection height with 45 mm resolution.
What is the difference between NPN and PNP outputs?
+
NPN output switches the signal line to 0 V (GND) when a beam is interrupted, and suits PLC or controller inputs configured for NPN (sinking) input. PNP output switches the signal line to +24 V, and suits PNP (sourcing) input.
The DPL-1040-NPN-NC uses an NPN Normally Closed output at DC 24 V ± 20 %. For PNP or relay output configurations, refer to other DPL Series models.
How do I connect a safety light curtain or area sensor to a PLC?
+
Connect the receiver signal output to a PLC input configured for NPN (sinking) operation. Confirm the power supply is DC 24 V ± 20 % and that the output logic (NC / NO) matches the PLC program.
For the DPL-1040-NPN-NC, the white wire is the signal output. Wire the emitter and receiver according to the wiring diagram, and verify the output state before connecting to the machine control circuit.
Why is my area sensor giving false detection?
+
False detection is usually caused by optical interference, misalignment, reflective surfaces near the beam path, strong ambient light, contamination on the lens, or unstable power supply.
Check alignment, clean the lenses, remove reflective objects close to the beam path, and confirm the DC 24 V power supply is stable. The DPL-1040-NPN-NC's dual-circuit self-checking design and line synchronization help reduce false detection in most industrial environments.
How much does a safety light curtain or area sensor cost in Indonesia?
+
The price depends on the beam quantity, optical-axis pitch, protection height, output type and mounting accessories. Compact models such as the DPL-1040-NPN-NC are generally more affordable than larger models with higher beam counts.
For pricing and availability in Indonesia, please contact DAPPRA directly via WhatsApp or the contact form.
Where can I buy safety light curtains or area sensors in Indonesia?
+
DAPPRA provides safety light curtains and area sensors in Indonesia with technical support and product documentation. You can contact DAPPRA Automation for product specifications, wiring support, and purchasing information.
Visit the DPL Series page or contact DAPPRA directly via WhatsApp for the DPL-1040-NPN-NC and other models.
How does DAPPRA compare with other safety light curtain or area sensor brands?
+
DAPPRA offers safety light curtains and area sensors with a focus on compact housing design, reliable detection, and local technical support in Indonesia. The DPL Series provides 5 / 10 / 20 / 40 mm optical-axis pitches with NPN, PNP and relay output options.
For a detailed comparison with other brands, or to discuss your specific application, please contact DAPPRA directly.
Discover More
Explore the DAPPRA Safety Light Curtain & Area Sensor Series
View all Safety Light Curtain and Industrial Area Sensor products and find the right solution for your application.
View ALL SeriesNeed Help?
Need DPL-1040-NPN-NC for Your Application?
Contact DAPPRA Automation for product specifications, NPN output wiring, technical documentation and purchasing support.
Contact DAPPRA EngineerRelated Technical Articles
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Related Technical Articles
✦ Compact Safety Light Curtain
NPN Output
NC Logic
IP65
DPL-1040-NPN-NC
Compact Safety Light Curtain for Automation Equipment · 10-Beam · 40 mm Pitch · 360 mm Protection Height
The DAPPRA DPL-1040-NPN-NC is a ten-beam Compact Safety Light Curtain designed for inspection and protection on automation equipment and small to medium-sized machinery.
It uses separate EMITTER and RECEIVER units to provide a 360 mm protection height, with a compact 35 × 28 mm aluminium alloy housing, an NPN Normally Closed output and a <5 ms response time.
The NPN NC output switches the signal line to 0 V when a beam is interrupted, interfacing directly with PLC and controller inputs configured for NPN (sinking) operation at DC 24 V ± 20 %. The standard detection distance is 0.1–6 m.
Primary Product Classification: Compact Safety Light Curtain.
Related Industry Terminology: Safety Light Curtain / Industrial Area Sensor / Machine Guarding.
Product Overview
DAPPRA DPL-1040-NPN-NC is a ten-beam Compact Safety Light Curtain designed for inspection and protection on automation equipment and small to medium-sized machinery. It uses separate EMITTER and RECEIVER units to provide a 360 mm protection height, with a 35 × 28 mm aluminium alloy housing, NPN NC output and a <5 ms response time.
The DPL Series uses Multiple Parallel Beam Through-Beam Detection Technology and adopts line synchronization between the emitter and receiver for reliable optical-beam operation. It provides 5 / 10 / 20 / 40 mm optical-axis pitches for high-precision inspection through to large-area guarding.
The DPL-1040-NPN-NC is suitable for machine protection, personnel protection, machine area detection, object detection, assembly stations and general industrial automation applications.
DPL-1040-NPN-NC Key Features
- 10 Optical Beams · 40 mm Optical-Axis Pitch
- 360 mm Protection Height
- 422 mm Total Height
- Resolution 45 mm
- NPN Transistor Output · Normally Closed (NC) Logic
- 0.1–6 m Standard Detection Distance
- <5 ms Response Time
- Compact 35 × 28 mm Aluminium Alloy Housing
- DC 24 V ± 20 % Operating Voltage
- ≤200 mA Output Current · <5 W Power Consumption
- IP65 Protection Rating
- Line Synchronization
- Dual-Circuit Self-Checking Output Design
- Integrated Protection Circuitry
- Top & Bottom / Side / Cantilever / Integrated Steel Tube Mounting Options
NPN Output Design with Normally Closed Logic
The DPL-1040-NPN-NC adopts an NPN transistor output with Normally Closed (NC) logic. The output switches the signal line to 0 V (GND) when the optical beam is interrupted, matching PLC and controller inputs configured for NPN (sinking) input.
With NC logic, the output is closed during normal operation and opens when a beam is interrupted — a configuration commonly used for machine stop circuits, where an interrupted beam or a loss of power results in a safe output state.
The product uses a 35 × 28 mm aluminium alloy housing with a dual-circuit self-checking output design and integrated protection circuitry (power over-voltage protection, reverse-polarity protection, output over-current protection), supporting stable operation in electrically noisy industrial environments.
The DPL Series focuses on achieving a balance between compact housing size, detection accuracy and machine protection.
Product Specifications
| Parameter | DPL-1040-NPN-NC |
|---|---|
| Product Series | DPL Series |
| Product Type | Compact Safety Light Curtain |
| SKU | OL15 |
| Optical Beam Quantity | 10 Beams |
| Optical-Axis Pitch | 40 mm |
| Protection Height | 360 mm |
| Total Height | 422 mm |
| Resolution | 45 mm |
| Housing Cross Section | 35 × 28 mm (Aluminium Alloy) |
| Response Time | <5 ms |
| Detection Distance | 0.1–6 m (Standard) |
| Operating Voltage | DC 24 V ± 20 % |
| Output Type | NPN Transistor Output |
| Output Logic | NC (Normally Closed) |
| Output Current | ≤200 mA |
| Power Consumption | <5 W |
| Protection Circuitry | Power over-voltage / reverse-polarity / output over-current |
| Self-Checking | Dual-circuit self-checking output design |
| Synchronization | Line Synchronization |
| Insulation Resistance | ≥100 MΩ |
| Dielectric Strength | AC 1500 V, 60 s — no breakdown or flashover |
| Protection Rating | IP65 |
| Operating Temperature | −10 ~ +55 °C |
| Operating Humidity | <85 % RH at 20 °C |
| Light Interference Resistance | 10,000 Lux (incident angle > 5°) |
| Mounting | Top & Bottom / Side / Cantilever / Integrated Steel Tube |
Optical Detection Structure
The DPL-1040-NPN-NC uses separate EMITTER and RECEIVER units to create a parallel infrared detection field.
The 10 optical beams are arranged with a 40 mm optical-axis pitch, providing a 360 mm protection height with 45 mm resolution.
EMITTER → Parallel Infrared Beams → RECEIVER → NPN OUTPUT (NC Logic)
When an object or person interrupts the infrared beam path, the receiver detects the change in the optical field and switches the corresponding NPN NC output to control the machine stop circuit via the connected PLC or controller.
Area Sensor vs Safety Light Curtain
The terms Area Sensor and Safety Light Curtain are commonly used in industrial automation to describe multi-beam photoelectric detection products, but they may represent different technical and safety requirements depending on the application.
An Industrial Area Sensor is generally used for multi-beam detection of personnel, objects, access areas and machine processes.
A Safety Light Curtain is typically associated with machine protection and applications where specific functional-safety requirements and applicable safety standards need to be considered.
The DPL-1040-NPN-NC is designed as a Compact Safety Light Curtain for inspection and protection on automation equipment, using an NPN Normally Closed output for integration with PLC and controller inputs. The appropriate safety configuration and integration should be determined according to the machine risk assessment and applicable safety requirements.
Compact Safety Light Curtain for Automation Equipment
Fast <5 ms Response
With a response time of <5 ms, the DPL-1040-NPN-NC provides fast detection for machinery safety applications, supporting rapid response to objects or personnel entering or passing through the sensing area.
Combined with line synchronization between the emitter and receiver and the dual-circuit self-checking output design, the DPL Series supports reliable machine protection in industrial environments.
IP65 Protection for Industrial Environments
The DPL-1040-NPN-NC features an IP65 protection rating with an aluminium alloy housing, making it suitable for industrial automation environments where protection against dust and water jets is required.
The operating temperature range is −10 ~ +55 °C with an operating humidity of <85 % RH at 20 °C, and light interference resistance of 10,000 Lux (incident angle > 5°).
NPN Normally Closed Output
The DPL-1040-NPN-NC uses an NPN transistor output with Normally Closed (NC) logic. The output switches the signal line to 0 V (GND) when the optical beam is interrupted, and interfaces directly with PLC and controller inputs configured for NPN (sinking) operation.
The output is rated for ≤200 mA output current, with an operating voltage of DC 24 V ± 20 % and power consumption of <5 W.
DPL-1040-NPN-NC Model Information
The model number identifies the DPL Series configuration, beam quantity, optical-axis pitch, output type and output logic.
Model Code
DPL
-
10
40
-
NPN
-
NC
DPL
Series prefix — DAPPRA DPL Series Compact Safety Light Curtain.
10 — Beam Quantity
Number of optical beams. This model uses 10 optical beams.
40 — Optical-Axis Pitch
Optical-axis pitch in mm. This model uses 40 mm beam spacing.
NPN — Output Type
NPN transistor output. The output switches the signal line to 0 V when a beam is interrupted.
NC — Output Logic
NC = Normally Closed; NO = Normally Open.
Field
Meaning
Value
DPL
Series prefix
DPL
Beam Quantity
Number of optical beams
10
Optical-Axis Pitch
Distance between adjacent optical axes
40 mm
Output Type
Transistor output configuration
NPN
Output Logic
Signal logic state
NC (Normally Closed)
Example: DPL-1040-NPN-NC = DPL Series, 10 beams, 40 mm optical-axis pitch, NPN output, Normally Closed logic.
Dimensions
The DPL-1040-NPN-NC features a 35 × 28 mm aluminium alloy housing with a 360 mm protection height and 422 mm total height.
Key dimensions:
- Housing Cross Section: 35 × 28 mm
- Optical-Axis Pitch: 40 mm
- Protection Height: 360 mm
- Total Height: 422 mm
- Resolution: 45 mm
Installation Method
The DPL Series supports multiple mounting configurations for different machinery structures. Standard top & bottom mounting brackets are included, with side mounting brackets, cantilever brackets and integrated steel tube brackets available as options.
The 35 × 28 mm aluminium alloy housing provides a stable mounting base while maintaining the compact cross-section required for space-restricted automation equipment.
The EMITTER and RECEIVER should be securely installed and accurately aligned to ensure reliable infrared detection.
- Top & Bottom Mounting Brackets — Standard mounting with side-fixing brackets, M3 screws, washers and spring washers
- Side Mounting Brackets — Lateral fixing with M6 long / short screws, spring washers, flat washers, nuts and sliding blocks
- Cantilever Brackets — Extended mounting positions with rotary arm and cantilever support rod
- Integrated Steel Tube Brackets — Floor-standing or free-standing guarding with φ27 tubes and brackets
DPL Series Model Selection
The DPL Series provides different beam quantities, optical-axis pitches and protection heights for different inspection and protection requirements.
For the DPL-1040-NPN-NC:
DPL-1040-NPN-NC → 10 Beams · 40 mm Optical-Axis Pitch · 360 mm Protection Height · 422 mm Total Height · NPN NC Output
For the complete DPL Series model selection table, including different beam quantities, optical-axis pitches, protection heights and output options, please visit the DPL Series page. [VIEW DPL SERIES MODEL SELECTION →]
Wiring & NPN Output
The DPL-1040-NPN-NC uses an NPN transistor output at DC 24 V ± 20 %. The receiver provides a sync port and an output port for connection to the PLC or machine control circuit. The NPN NC output switches the signal line to 0 V when a beam is interrupted.
Before connection, verify the output type (NPN / PNP) and output logic (NC / NO) of the selected model and the input configuration of the machine control system.
| Electrical Configuration | Specification |
|---|---|
| Operating Voltage | DC 24 V ± 20 % |
| Output Type | NPN Transistor Output |
| Output Logic | NC (Normally Closed) |
| Output Current | ≤200 mA |
| Power Consumption | <5 W |
| Synchronization | Line Synchronization |
| Control Interface | Direct connection to PLC or controller NPN (sinking) input |
Wire Colour Reference
| Port | Function | Wire Colour |
|---|---|---|
| Emitter | +24 VDC | Brown (BN) |
| Emitter | 0 V | Blue (BU) |
| Emitter | Sync CP | Black (BK) |
| Receiver | +24 VDC | Brown (BN) |
| Receiver | 0 V | Blue (BU) |
| Receiver | Sync CP | Black (BK) |
| Receiver | Signal Output (NPN NC) | White (WH) |
Controller Options
The DPL Series can be integrated with dedicated controllers for different machine installation and control requirements.
Two controller configurations are available:
Built-in Controller
DAPPRA DSC-E220
DAPPRA DSC-E220 is a built-in controller designed for installation inside the machine cabinet. It provides power and control functions for compatible Safety Light Curtain and Industrial Area Sensor systems.
View DSC-E220 Built-in Controller →External Controller
DAPPRA DSC-G220
DAPPRA DSC-G220 is an external controller designed for use with compatible Safety Light Curtain and Industrial Area Sensor systems. It provides an external control interface for machine integration and control applications.
View DSC-G220 External Controller →One controller can manage multiple DPL sensor sets, forming multi-face protection such as one-to-two or one-to-three configurations for larger press machines.
Applications
Machine and Personnel Applications
- Machine Protection
- Personnel Protection
- Machine Area Detection
- Object Detection
- Assembly Stations
- Material Presence Checking
Equipment and Machinery Applications
- Automation Equipment
- Small & Medium Machinery
- Packaging Machinery
- Cutting Equipment
- Robotic Equipment
- Large-Area Guarding
FAQ
Common questions about the DPL-1040-NPN-NC compact safety light curtain — model selection, output logic, installation, wiring and troubleshooting.
What is the DAPPRA DPL-1040-NPN-NC?
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The DAPPRA DPL-1040-NPN-NC is a compact Safety Light Curtain in the DPL Series. It uses 10 optical beams with a 40 mm optical-axis pitch, providing a 360 mm protection height and a 422 mm total height. It has an NPN transistor output with Normally Closed (NC) logic, a 0.1–6 m standard detection distance, a <5 ms response time and an IP65 protection rating.
What is the difference between a Safety Light Curtain and an Area Sensor?
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An Area Sensor is generally used for multi-beam detection of personnel, objects, access areas and machine processes. A Safety Light Curtain is typically associated with machine protection and applications where specific functional-safety requirements and applicable safety standards need to be considered.
The DPL-1040-NPN-NC is designed as a Compact Safety Light Curtain for inspection and protection on automation equipment, using an NPN Normally Closed output for integration with PLC and controller inputs.
What safety light curtain or area sensor do I need for my machine?
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The required model depends on the protection height, the smallest object or body part that must be detected, the detection distance, and the output type required by the machine control system.
For larger openings and large-area guarding, the DPL-1040-NPN-NC with 10 beams at 40 mm pitch provides a 360 mm protection height. For smaller objects or finger protection, choose a DPL Series model with a smaller pitch such as 5 mm, 10 mm or 20 mm.
How many beams should I choose for a safety light curtain or area sensor?
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The required beam quantity depends on the protection height and the optical-axis pitch. Protection height is calculated as (Beam Quantity − 1) × Optical-Axis Pitch.
The DPL-1040-NPN-NC uses 10 beams at a 40 mm pitch, giving a 360 mm protection height — suitable for larger openings and large-area guarding on automation equipment.
What beam spacing or resolution should I choose?
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Beam spacing (optical-axis pitch) determines the resolution. Smaller pitches provide higher resolution for small-object detection, while larger pitches cover larger areas with fewer beams.
The DPL-1040-NPN-NC uses a 40 mm optical-axis pitch with 45 mm resolution, suitable for large-area guarding, object detection and machine area detection.
What is the difference between 10 mm, 20 mm, 30 mm and 40 mm resolution or beam spacing?
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Resolution is determined by the optical-axis pitch. A 5 mm pitch gives 10 mm resolution for small-object detection; a 10 mm pitch gives 15 mm resolution; a 20 mm pitch gives 25 mm resolution; and a 40 mm pitch gives 45 mm resolution for large-area guarding.
The DPL-1040-NPN-NC uses a 40 mm pitch with 45 mm resolution — suitable for body detection, large-area guarding and object detection where very small objects are not the target.
How do I choose the correct sensing distance?
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Choose a sensing distance that is greater than the physical distance between the emitter and receiver, with some margin for alignment and installation tolerances.
The DPL-1040-NPN-NC supports a standard detection distance of 0.1–6 m, suitable for most automation equipment and machine guarding layouts.
Can a safety light curtain be used for a press machine?
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Yes. Safety light curtains are commonly used on press machines to protect operators from the hazardous area. The light curtain monitors the access opening and stops the machine when a hand or body part enters the hazardous zone.
The DPL-1040-NPN-NC's NPN NC output simplifies connection to the press machine's control circuit. Safety distance and protection height should be determined according to the machine risk assessment and applicable safety standards.
Can an area sensor be used for object counting?
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Yes. Area sensors can be used for object counting on conveyors and production lines by detecting each object as it interrupts one or more beams.
The DPL-1040-NPN-NC provides an NPN NC output that can be connected to a PLC or counter input. With 40 mm pitch and 45 mm resolution, it is suitable for counting medium to large objects.
How does a safety light curtain or area sensor detect objects?
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The DPL-1040-NPN-NC uses separate EMITTER and RECEIVER units to create a parallel infrared detection field. When an object or person interrupts the infrared beam path, the receiver detects the change in the optical field and switches the corresponding output.
The 10 optical beams are arranged with a 40 mm optical-axis pitch, providing a 360 mm protection height with 45 mm resolution.
What is the difference between NPN and PNP outputs?
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NPN output switches the signal line to 0 V (GND) when a beam is interrupted, and suits PLC or controller inputs configured for NPN (sinking) input. PNP output switches the signal line to +24 V, and suits PNP (sourcing) input.
The DPL-1040-NPN-NC uses an NPN Normally Closed output at DC 24 V ± 20 %. For PNP or relay output configurations, refer to other DPL Series models.
How do I connect a safety light curtain or area sensor to a PLC?
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Connect the receiver signal output to a PLC input configured for NPN (sinking) operation. Confirm the power supply is DC 24 V ± 20 % and that the output logic (NC / NO) matches the PLC program.
For the DPL-1040-NPN-NC, the white wire is the signal output. Wire the emitter and receiver according to the wiring diagram, and verify the output state before connecting to the machine control circuit.
Why is my area sensor giving false detection?
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False detection is usually caused by optical interference, misalignment, reflective surfaces near the beam path, strong ambient light, contamination on the lens, or unstable power supply.
Check alignment, clean the lenses, remove reflective objects close to the beam path, and confirm the DC 24 V power supply is stable. The DPL-1040-NPN-NC's dual-circuit self-checking design and line synchronization help reduce false detection in most industrial environments.
How much does a safety light curtain or area sensor cost in Indonesia?
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The price depends on the beam quantity, optical-axis pitch, protection height, output type and mounting accessories. Compact models such as the DPL-1040-NPN-NC are generally more affordable than larger models with higher beam counts.
For pricing and availability in Indonesia, please contact DAPPRA directly via WhatsApp or the contact form.
Where can I buy safety light curtains or area sensors in Indonesia?
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DAPPRA provides safety light curtains and area sensors in Indonesia with technical support and product documentation. You can contact DAPPRA Automation for product specifications, wiring support, and purchasing information.
Visit the DPL Series page or contact DAPPRA directly via WhatsApp for the DPL-1040-NPN-NC and other models.
How does DAPPRA compare with other safety light curtain or area sensor brands?
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DAPPRA offers safety light curtains and area sensors with a focus on compact housing design, reliable detection, and local technical support in Indonesia. The DPL Series provides 5 / 10 / 20 / 40 mm optical-axis pitches with NPN, PNP and relay output options.
For a detailed comparison with other brands, or to discuss your specific application, please contact DAPPRA directly.
Discover More
Explore the DAPPRA Safety Light Curtain & Area Sensor Series
View all Safety Light Curtain and Industrial Area Sensor products and find the right solution for your application.
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