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DPB-1220-NPN-NC Front Ultra-Thin Safety Light Curtain Industrial Area Sensor
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DPB-1220-NPN-NC Front Ultra-Thin Safety Light Curtain Industrial Area Sensor is a 12-beam industrial area sensor with 20 mm optical axis pitch and 220 mm protection height. Separate emitter and receiver units, 14.5 × 28 mm front ultra-thin housing, 285 mm total height, NPN NC output, ≤5 ms response time, IP65 protection, TYPE 4 safety level, ideal for compact machines and space-constrained automation equipment.
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✦ Front Ultra-Thin Industrial Area Sensor
Safety Light Curtain
NPN NC
IP65
DPB-1220-NPN-NC
Front Ultra-Thin Industrial Area Sensor & Safety Light Curtain · 12-Beam · 20 mm Pitch · 220 mm Protection Height
The DAPPRA DPB-1220-NPN-NC is a twelve-beam Front Ultra-Thin Industrial Area Sensor and Safety Light Curtain designed for compact machines and space-constrained automation equipment.
It uses separate EMITTER and RECEIVER units to provide a 220 mm protection height, with a 14.5 × 28 mm front ultra-thin housing cross section, NPN normally closed output and a ≤5 ms response time.
Its 14.5 × 28 mm front ultra-thin housing saves installation space for compact machines and confined automation equipment, supporting reliable multi-beam detection in space-limited installations.
Primary Product Classification: Front Ultra-Thin Industrial Area Sensor / Safety Light Curtain.
Related Industry Terminology: Area Sensor / Light Curtain Sensor / Safety Light Curtain.
Product Overview
DAPPRA DPB-1220-NPN-NC is a twelve-beam Front Ultra-Thin Industrial Area Sensor and Safety Light Curtain designed for compact machines and space-constrained automation equipment. It uses separate EMITTER and RECEIVER units to provide a 220 mm protection height, with a 14.5 × 28 mm front ultra-thin housing cross section, NPN normally closed output and a ≤5 ms response time.
The DPB Series uses Multiple Parallel Beam Through-Beam Detection Technology and provides different beam quantities, optical-axis pitches and protection heights for compact automation equipment, machinery protection, personnel protection, access detection and object detection applications.
The DPB-1220-NPN-NC is suitable for personnel detection, machine access detection, machine protection and object detection.
DPB-1220-NPN-NC Key Features
- Front Ultra-Thin Design
- 14.5 × 28 mm Housing Cross Section
- 12 Optical Beams
- 20 mm Optical-Axis Pitch
- 220 mm Protection Height
- 285 mm Total Height
- ≤5 ms Response Time
- 0.1–3 m Detection Distance
- NPN Normally Closed Output
- DC24V ±20% Working Voltage
- IP65 Protection Rating
- Line Synchronization
- TYPE 4 Safety Level
- 2 m Signal Connection Cables
- Top & Bottom Bracket Mounting
Front Ultra-Thin Housing Design
The DPB Series uses a front ultra-thin housing design with a confirmed cross section of 14.5 × 28 mm. This housing profile allows the sensor to be installed on compact machines and confined automation equipment where standard-sized sensors would not fit.
The aluminum alloy housing supports reliable multi-beam detection while maintaining TYPE 4 safety level characteristics, complete self-checking diagnostics and strong electromagnetic interference resistance.
The DPB Series focuses on achieving a balance between ultra-thin installation, optical detection reliability and industrial durability.
Product Specifications
| Parameter | DPB-1220-NPN-NC |
|---|---|
| Product Series | DPB Series |
| Product Type | Front Ultra-Thin Industrial Area Sensor & Safety Light Curtain |
| SKU | OL09 |
| Optical Beam Quantity | 12 Beams |
| Optical-Axis Pitch | 20 mm |
| Protection Height | 220 mm |
| Total Height | 285 mm |
| Housing Cross Section | 14.5 × 28 mm (Front Ultra-Thin) |
| Response Time | ≤5 ms |
| Detection Distance | 0.1–3 m |
| Working Voltage | DC24V ±20% |
| Output | NPN |
| Signal Logic | NC (Normally Closed) |
| Protection Rating | IP65 |
| Housing Material | Aluminum Alloy |
| Synchronization | Line Synchronization |
| Safety Level | TYPE 4 |
| Cable Length | 2 m (Standard) / Custom Available |
| Mounting | Top & Bottom Brackets (M4 Screws) |
Optical Detection Structure
The DPB-1220-NPN-NC uses separate EMITTER and RECEIVER units to create a parallel infrared detection field.
The 12 optical beams are arranged with a 20 mm optical-axis pitch, providing a 220 mm protection height.
EMITTER → Parallel Infrared Beams → RECEIVER
When an object or person interrupts the infrared beam path, the receiver detects the change in the optical field and provides the corresponding NPN NC output.
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 DPB-1220-NPN-NC combines multi-beam infrared detection with a front ultra-thin design, making it suitable for personnel detection, object detection, access detection and machine protection applications in space-limited installations.
Front Ultra-Thin Industrial Area Sensor / Safety Light Curtain
Fast ≤5 ms Response
With a response time of ≤5 ms, the DPB-1220-NPN-NC provides fast detection for applications requiring rapid response to objects or personnel entering or passing through the sensing area.
Combined with line synchronization between the emitter and receiver, the system improves resistance to optical interference while supporting stable multi-beam detection.
IP65 Protection for Industrial Environments
The DPB-1220-NPN-NC features an IP65 protection rating with an aluminum alloy housing, making it suitable for industrial automation environments where protection against dust and water jets is required.
The DPB Series operates on a DC24V ±20% power supply with protection against power overvoltage, reverse polarity and output overcurrent.
NPN Normally Closed Output
The DPB-1220-NPN-NC uses an NPN Normally Closed (NC) output configuration for connection with compatible industrial control systems. NPN NO, PNP NC and PNP NO output options are also available within the DPB Series.
DPB-1220-NPN-NC Model Information
The model number identifies the DPB Series configuration, beam quantity, optical-axis pitch, output type and signal logic.
Model Code
DPB
-
12
20
-
NPN
-
NC
DPB
Series prefix — DAPPRA DPB Series Front Ultra-Thin Industrial Area Sensor & Safety Light Curtain.
12 — Beam Quantity
Number of optical beams. This model uses 12 optical beams.
20 — Optical-Axis Pitch
Optical-axis pitch in mm. This model uses 20 mm beam spacing.
NPN — Output Type
Output transistor type. This model uses NPN transistor output.
NC — Output Logic
NC = Normally Closed; NO = Normally Open. This model uses Normally Closed logic.
Field
Meaning
Value
DPB
Series prefix
DPB
Beam Quantity
Number of optical beams
12
Optical-Axis Pitch
Distance between adjacent optical axes
20 mm
Output Type
Transistor output configuration
NPN
Output Logic
Signal logic state
NC (Normally Closed)
Example: DPB-1220-NPN-NC = DPB Series, 12 beams, 20 mm optical-axis pitch,
NPN output, Normally Closed logic.
Dimensions
The DPB-1220-NPN-NC features a 14.5 × 28 mm front ultra-thin housing with a 220 mm protection height and 285 mm total height.
Key dimensions:
- Housing Cross Section: 14.5 × 28 mm
- Optical-Axis Pitch: 20 mm
- Protection Height: 220 mm
- Total Height: 285 mm
Installation Method
The DPB Series uses a top and bottom bracket mounting configuration. The emitter and receiver are fixed to the machine frame through the mounting brackets at both ends of the housing.
The 14.5 × 28 mm front ultra-thin housing provides a compact installation profile while maintaining the internal structure required for reliable multi-beam detection.
The EMITTER and RECEIVER should be securely installed and accurately aligned to ensure reliable infrared detection.
- Mounting Position — Top and bottom ends of the emitter and receiver housing
- Bracket Set — Standard top and bottom mounting brackets with M4 screws, nuts, washers and spring washers
- Alignment — The emitter and receiver must be mounted parallel with the optical axes facing each other
DPB Series Model Selection
The DPB Series provides different beam quantities, optical-axis pitches and protection heights for different industrial detection and machine protection requirements.
For the DPB-1220-NPN-NC:
DPB-1220-NPN-NC → 12 Beams · 20 mm Optical-Axis Pitch · 220 mm Protection Height · 285 mm Total Height
For the complete DPB Series model selection table, including different beam quantities, optical-axis pitches and protection heights, please visit the DPB Series page. [VIEW DPB SERIES MODEL SELECTION →]
Wiring & Controller Compatibility
The DPB-1220-NPN-NC provides an NPN normally closed output with a DC24V ±20% working voltage. The output is compatible with NPN-input PLCs, controllers or interface circuits.
Before connection, verify the input type and wiring configuration of the control system.
The DPB Series uses separate EMITTER and RECEIVER units with line synchronization for coordinated optical-beam operation.
| Electrical Configuration | Specification |
|---|---|
| Working Voltage | DC24V ±20% |
| Output Type | NPN |
| Signal Logic | NC (Normally Closed) |
| Synchronization | Line Synchronization |
| Safety Level | TYPE 4 |
| Control Interface | Compatible with NPN-input PLCs, controllers or interface circuits |
Controller Options
The DPB 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 DPB 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
- Material Detection
Automation and Equipment Applications
- Conveyor Monitoring
- Automated Equipment
- Packaging Machinery
- Cutting Equipment
- Hydraulic Machinery
- Robotic Equipment
- General Industrial Automation
FAQ
Common questions about safety light curtain working principle, protection height selection, installation and troubleshooting.
How does a safety light curtain work?
+
A safety light curtain uses an EMITTER and a RECEIVER. The emitter produces multiple parallel infrared beams, and the receiver monitors them continuously.
When an object or person interrupts one or more beams, the receiver detects the change and switches its output signal, which can stop the machine or trigger a control action. The DPB-1220-NPN-NC uses 12 beams at 20 mm pitch, providing a 220 mm protection height with a ≤5 ms response time.
When should I use a safety light curtain instead of an area sensor?
+
Choose a safety light curtain when the application involves machine protection and requires functional safety considerations, such as press machines, shearing machines and hazardous machine openings. In these cases, safety distance, resolution and response time must be evaluated against applicable standards.
Choose an area sensor for general detection of objects, personnel presence, access monitoring and machine processes where functional safety is not the primary requirement. The DPB-1220-NPN-NC can serve both roles depending on the risk assessment and integration.
What protection height do I need for my machine opening?
+
The protection height should cover the entire machine opening or hazardous zone where any part of the body could enter. It is common to select a protection height equal to or slightly greater than the opening height.
The DPB-1220-NPN-NC provides a 220 mm protection height with a total height of 285 mm, suitable for medium openings on compact machines. For larger openings, select a DPB Series model with more beams and greater protection height.
My machine opening is 380 mm. Which safety light curtain should I choose?
+
For a 380 mm machine opening, choose a safety light curtain with a protection height that covers the full opening plus any additional hazard area. The DPB-1220-NPN-NC at 220 mm is not sufficient by itself for a 380 mm opening.
You would need a model with a higher beam count and protection height, such as another DPB or DPF Series model that covers 380 mm or more. The correct model also depends on resolution, safety distance and controller selection. Contact DAPPRA for model selection assistance.
I need a 20 mm resolution safety light curtain. Which model should I choose?
+
A 20 mm resolution light curtain is commonly used for hand detection and access protection where finer detection capability is needed. The required beam count depends on the protection height you need.
The DPB-1220-NPN-NC uses a 20 mm optical-axis pitch with 12 beams, giving a 220 mm protection height. For a taller protection height at the same 20 mm pitch, select a DPB Series model with more beams. For press machine protection, the DPF Series with controller-based output may be more suitable.
How do I select the right light curtain based on machine dimensions?
+
Start with three key measurements: the machine opening height (to determine protection height), the detection distance between emitter and receiver, and the smallest object or body part that must be detected (to determine beam pitch and resolution).
Then consider response time, safety distance, output type (NPN / PNP), and mounting space. The DPB-1220-NPN-NC is a front ultra-thin model, ideal when installation space is limited. Send your machine dimensions to DAPPRA for a recommendation.
Can a safety light curtain protect operators from a machine hazard?
+
Yes. When correctly selected, installed and integrated, a safety light curtain can detect an operator entering the hazardous zone and send a stop signal to the machine before contact occurs. The protection depends on correct safety distance, resolution, response time and machine stopping performance.
The DPB-1220-NPN-NC provides fast ≤5 ms response with a 220 mm protection height, suitable for medium machine openings. The final safety configuration should be determined by a qualified person based on the machine risk assessment.
Can an area sensor be used for material handling?
+
Yes. Area sensors are widely used in material handling for detecting pallets, boxes, trays or parts moving through a transfer point, checking presence before gripping, or confirming that a load has cleared a zone.
The DPB-1220-NPN-NC's 12-beam detection field and 0.1–3 m detection distance make it suitable for material handling applications where multiple positions or heights need to be monitored simultaneously.
Can an area sensor be used for detecting missing products?
+
Yes. Missing-product detection is one of the most common area sensor applications. When a product is present, it blocks one or more beams; when it is missing, the beams remain unblocked and the PLC detects the condition.
The DPB-1220-NPN-NC with 12 beams at 20 mm pitch can detect missing products of different sizes and positions within the 220 mm detection field, as long as the product height interrupts at least one beam.
Does a safety light curtain require a safety relay?
+
It depends on the safety architecture and the machine risk assessment. In many machine protection applications, a safety relay or safety controller is used between the light curtain and the machine contactors to provide dual-channel monitoring, self-checking and safe stop functions.
The DPB-1220-NPN-NC provides an NPN NC output that can be connected directly to a PLC or controller. For higher safety integrity applications, integrating a dedicated safety relay or safety PLC is recommended. Contact DAPPRA to discuss the specific control architecture.
How do I install and align a safety light curtain?
+
Install the emitter and receiver on rigid brackets at both ends of the housing, keeping them parallel and facing each other. Confirm that the housing cross section (14.5 × 28 mm for the DPB-1220-NPN-NC) fits the mounting space and that cables are routed away from high-voltage lines.
Power on the sensor and observe the alignment indicator. Adjust the position of one or both units until all beams are detected without interruption. After alignment, tighten all mounting screws and recheck the output status.
How do I align the emitter and receiver of a light curtain?
+
Loosen the mounting brackets slightly so the units can be adjusted, then align the emitter and receiver so their optical axes are parallel and directly facing each other. Check the alignment indicator on the receiver or output signal to confirm all beams are received.
Adjust in both horizontal and vertical directions. Once all beams are aligned and stable, tighten the brackets firmly. The DPB Series uses line synchronization, so the emitter and receiver must be correctly aligned before the output becomes stable.
Why is my safety light curtain always triggered?
+
If the output stays in the triggered state, the most likely causes are misalignment, obstruction in the beam path, contamination on the lens, incorrect wiring of the NC output, or unstable power supply.
Check that the emitter and receiver are properly aligned, that no object interrupts the beams, that the lenses are clean, and that the DC24V supply is stable. Also verify the NPN NC output wiring and confirm the PLC or controller input polarity.
Why are the emitter and receiver not communicating?
+
No communication between emitter and receiver usually indicates a power supply problem, incorrect wiring, wrong synchronization mode, or serious misalignment. Confirm that both units are powered by DC24V ±20% and that the line synchronization wires are correctly connected.
Also verify that the emitter and receiver are the matching pair from the same DPB Series set, and that the distance between them is within the 0.1–3 m detection range. If the output still fails, contact DAPPRA for support.
Discover More
Explore the DAPPRA Front Ultra-Thin Area Sensor Series
View all DPB Series products and find the right solution for your space-constrained application.
View All SeriesNeed Help?
Need DPB-1220-NPN-NC for Your Application?
Contact DAPPRA Automation for product specifications, technical documentation, application information and purchasing support.
Contact DAPPRA EngineerRelated Technical Articles
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Related Technical Articles
✦ Front Ultra-Thin Industrial Area Sensor
Safety Light Curtain
NPN NC
IP65
DPB-1220-NPN-NC
Front Ultra-Thin Industrial Area Sensor & Safety Light Curtain · 12-Beam · 20 mm Pitch · 220 mm Protection Height
The DAPPRA DPB-1220-NPN-NC is a twelve-beam Front Ultra-Thin Industrial Area Sensor and Safety Light Curtain designed for compact machines and space-constrained automation equipment.
It uses separate EMITTER and RECEIVER units to provide a 220 mm protection height, with a 14.5 × 28 mm front ultra-thin housing cross section, NPN normally closed output and a ≤5 ms response time.
Its 14.5 × 28 mm front ultra-thin housing saves installation space for compact machines and confined automation equipment, supporting reliable multi-beam detection in space-limited installations.
Primary Product Classification: Front Ultra-Thin Industrial Area Sensor / Safety Light Curtain.
Related Industry Terminology: Area Sensor / Light Curtain Sensor / Safety Light Curtain.
Product Overview
DAPPRA DPB-1220-NPN-NC is a twelve-beam Front Ultra-Thin Industrial Area Sensor and Safety Light Curtain designed for compact machines and space-constrained automation equipment. It uses separate EMITTER and RECEIVER units to provide a 220 mm protection height, with a 14.5 × 28 mm front ultra-thin housing cross section, NPN normally closed output and a ≤5 ms response time.
The DPB Series uses Multiple Parallel Beam Through-Beam Detection Technology and provides different beam quantities, optical-axis pitches and protection heights for compact automation equipment, machinery protection, personnel protection, access detection and object detection applications.
The DPB-1220-NPN-NC is suitable for personnel detection, machine access detection, machine protection and object detection.
DPB-1220-NPN-NC Key Features
- Front Ultra-Thin Design
- 14.5 × 28 mm Housing Cross Section
- 12 Optical Beams
- 20 mm Optical-Axis Pitch
- 220 mm Protection Height
- 285 mm Total Height
- ≤5 ms Response Time
- 0.1–3 m Detection Distance
- NPN Normally Closed Output
- DC24V ±20% Working Voltage
- IP65 Protection Rating
- Line Synchronization
- TYPE 4 Safety Level
- 2 m Signal Connection Cables
- Top & Bottom Bracket Mounting
Front Ultra-Thin Housing Design
The DPB Series uses a front ultra-thin housing design with a confirmed cross section of 14.5 × 28 mm. This housing profile allows the sensor to be installed on compact machines and confined automation equipment where standard-sized sensors would not fit.
The aluminum alloy housing supports reliable multi-beam detection while maintaining TYPE 4 safety level characteristics, complete self-checking diagnostics and strong electromagnetic interference resistance.
The DPB Series focuses on achieving a balance between ultra-thin installation, optical detection reliability and industrial durability.
Product Specifications
| Parameter | DPB-1220-NPN-NC |
|---|---|
| Product Series | DPB Series |
| Product Type | Front Ultra-Thin Industrial Area Sensor & Safety Light Curtain |
| SKU | OL09 |
| Optical Beam Quantity | 12 Beams |
| Optical-Axis Pitch | 20 mm |
| Protection Height | 220 mm |
| Total Height | 285 mm |
| Housing Cross Section | 14.5 × 28 mm (Front Ultra-Thin) |
| Response Time | ≤5 ms |
| Detection Distance | 0.1–3 m |
| Working Voltage | DC24V ±20% |
| Output | NPN |
| Signal Logic | NC (Normally Closed) |
| Protection Rating | IP65 |
| Housing Material | Aluminum Alloy |
| Synchronization | Line Synchronization |
| Safety Level | TYPE 4 |
| Cable Length | 2 m (Standard) / Custom Available |
| Mounting | Top & Bottom Brackets (M4 Screws) |
Optical Detection Structure
The DPB-1220-NPN-NC uses separate EMITTER and RECEIVER units to create a parallel infrared detection field.
The 12 optical beams are arranged with a 20 mm optical-axis pitch, providing a 220 mm protection height.
EMITTER → Parallel Infrared Beams → RECEIVER
When an object or person interrupts the infrared beam path, the receiver detects the change in the optical field and provides the corresponding NPN NC output.
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 DPB-1220-NPN-NC combines multi-beam infrared detection with a front ultra-thin design, making it suitable for personnel detection, object detection, access detection and machine protection applications in space-limited installations.
Front Ultra-Thin Industrial Area Sensor / Safety Light Curtain
Fast ≤5 ms Response
With a response time of ≤5 ms, the DPB-1220-NPN-NC provides fast detection for applications requiring rapid response to objects or personnel entering or passing through the sensing area.
Combined with line synchronization between the emitter and receiver, the system improves resistance to optical interference while supporting stable multi-beam detection.
IP65 Protection for Industrial Environments
The DPB-1220-NPN-NC features an IP65 protection rating with an aluminum alloy housing, making it suitable for industrial automation environments where protection against dust and water jets is required.
The DPB Series operates on a DC24V ±20% power supply with protection against power overvoltage, reverse polarity and output overcurrent.
NPN Normally Closed Output
The DPB-1220-NPN-NC uses an NPN Normally Closed (NC) output configuration for connection with compatible industrial control systems. NPN NO, PNP NC and PNP NO output options are also available within the DPB Series.
DPB-1220-NPN-NC Model Information
The model number identifies the DPB Series configuration, beam quantity, optical-axis pitch, output type and signal logic.
Model Code
DPB
-
12
20
-
NPN
-
NC
DPB
Series prefix — DAPPRA DPB Series Front Ultra-Thin Industrial Area Sensor & Safety Light Curtain.
12 — Beam Quantity
Number of optical beams. This model uses 12 optical beams.
20 — Optical-Axis Pitch
Optical-axis pitch in mm. This model uses 20 mm beam spacing.
NPN — Output Type
Output transistor type. This model uses NPN transistor output.
NC — Output Logic
NC = Normally Closed; NO = Normally Open. This model uses Normally Closed logic.
Field
Meaning
Value
DPB
Series prefix
DPB
Beam Quantity
Number of optical beams
12
Optical-Axis Pitch
Distance between adjacent optical axes
20 mm
Output Type
Transistor output configuration
NPN
Output Logic
Signal logic state
NC (Normally Closed)
Example: DPB-1220-NPN-NC = DPB Series, 12 beams, 20 mm optical-axis pitch,
NPN output, Normally Closed logic.
Dimensions
The DPB-1220-NPN-NC features a 14.5 × 28 mm front ultra-thin housing with a 220 mm protection height and 285 mm total height.
Key dimensions:
- Housing Cross Section: 14.5 × 28 mm
- Optical-Axis Pitch: 20 mm
- Protection Height: 220 mm
- Total Height: 285 mm
Installation Method
The DPB Series uses a top and bottom bracket mounting configuration. The emitter and receiver are fixed to the machine frame through the mounting brackets at both ends of the housing.
The 14.5 × 28 mm front ultra-thin housing provides a compact installation profile while maintaining the internal structure required for reliable multi-beam detection.
The EMITTER and RECEIVER should be securely installed and accurately aligned to ensure reliable infrared detection.
- Mounting Position — Top and bottom ends of the emitter and receiver housing
- Bracket Set — Standard top and bottom mounting brackets with M4 screws, nuts, washers and spring washers
- Alignment — The emitter and receiver must be mounted parallel with the optical axes facing each other
DPB Series Model Selection
The DPB Series provides different beam quantities, optical-axis pitches and protection heights for different industrial detection and machine protection requirements.
For the DPB-1220-NPN-NC:
DPB-1220-NPN-NC → 12 Beams · 20 mm Optical-Axis Pitch · 220 mm Protection Height · 285 mm Total Height
For the complete DPB Series model selection table, including different beam quantities, optical-axis pitches and protection heights, please visit the DPB Series page. [VIEW DPB SERIES MODEL SELECTION →]
Wiring & Controller Compatibility
The DPB-1220-NPN-NC provides an NPN normally closed output with a DC24V ±20% working voltage. The output is compatible with NPN-input PLCs, controllers or interface circuits.
Before connection, verify the input type and wiring configuration of the control system.
The DPB Series uses separate EMITTER and RECEIVER units with line synchronization for coordinated optical-beam operation.
| Electrical Configuration | Specification |
|---|---|
| Working Voltage | DC24V ±20% |
| Output Type | NPN |
| Signal Logic | NC (Normally Closed) |
| Synchronization | Line Synchronization |
| Safety Level | TYPE 4 |
| Control Interface | Compatible with NPN-input PLCs, controllers or interface circuits |
Controller Options
The DPB 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 DPB 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
- Material Detection
Automation and Equipment Applications
- Conveyor Monitoring
- Automated Equipment
- Packaging Machinery
- Cutting Equipment
- Hydraulic Machinery
- Robotic Equipment
- General Industrial Automation
FAQ
Common questions about safety light curtain working principle, protection height selection, installation and troubleshooting.
How does a safety light curtain work?
+
A safety light curtain uses an EMITTER and a RECEIVER. The emitter produces multiple parallel infrared beams, and the receiver monitors them continuously.
When an object or person interrupts one or more beams, the receiver detects the change and switches its output signal, which can stop the machine or trigger a control action. The DPB-1220-NPN-NC uses 12 beams at 20 mm pitch, providing a 220 mm protection height with a ≤5 ms response time.
When should I use a safety light curtain instead of an area sensor?
+
Choose a safety light curtain when the application involves machine protection and requires functional safety considerations, such as press machines, shearing machines and hazardous machine openings. In these cases, safety distance, resolution and response time must be evaluated against applicable standards.
Choose an area sensor for general detection of objects, personnel presence, access monitoring and machine processes where functional safety is not the primary requirement. The DPB-1220-NPN-NC can serve both roles depending on the risk assessment and integration.
What protection height do I need for my machine opening?
+
The protection height should cover the entire machine opening or hazardous zone where any part of the body could enter. It is common to select a protection height equal to or slightly greater than the opening height.
The DPB-1220-NPN-NC provides a 220 mm protection height with a total height of 285 mm, suitable for medium openings on compact machines. For larger openings, select a DPB Series model with more beams and greater protection height.
My machine opening is 380 mm. Which safety light curtain should I choose?
+
For a 380 mm machine opening, choose a safety light curtain with a protection height that covers the full opening plus any additional hazard area. The DPB-1220-NPN-NC at 220 mm is not sufficient by itself for a 380 mm opening.
You would need a model with a higher beam count and protection height, such as another DPB or DPF Series model that covers 380 mm or more. The correct model also depends on resolution, safety distance and controller selection. Contact DAPPRA for model selection assistance.
I need a 20 mm resolution safety light curtain. Which model should I choose?
+
A 20 mm resolution light curtain is commonly used for hand detection and access protection where finer detection capability is needed. The required beam count depends on the protection height you need.
The DPB-1220-NPN-NC uses a 20 mm optical-axis pitch with 12 beams, giving a 220 mm protection height. For a taller protection height at the same 20 mm pitch, select a DPB Series model with more beams. For press machine protection, the DPF Series with controller-based output may be more suitable.
How do I select the right light curtain based on machine dimensions?
+
Start with three key measurements: the machine opening height (to determine protection height), the detection distance between emitter and receiver, and the smallest object or body part that must be detected (to determine beam pitch and resolution).
Then consider response time, safety distance, output type (NPN / PNP), and mounting space. The DPB-1220-NPN-NC is a front ultra-thin model, ideal when installation space is limited. Send your machine dimensions to DAPPRA for a recommendation.
Can a safety light curtain protect operators from a machine hazard?
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Yes. When correctly selected, installed and integrated, a safety light curtain can detect an operator entering the hazardous zone and send a stop signal to the machine before contact occurs. The protection depends on correct safety distance, resolution, response time and machine stopping performance.
The DPB-1220-NPN-NC provides fast ≤5 ms response with a 220 mm protection height, suitable for medium machine openings. The final safety configuration should be determined by a qualified person based on the machine risk assessment.
Can an area sensor be used for material handling?
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Yes. Area sensors are widely used in material handling for detecting pallets, boxes, trays or parts moving through a transfer point, checking presence before gripping, or confirming that a load has cleared a zone.
The DPB-1220-NPN-NC's 12-beam detection field and 0.1–3 m detection distance make it suitable for material handling applications where multiple positions or heights need to be monitored simultaneously.
Can an area sensor be used for detecting missing products?
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Yes. Missing-product detection is one of the most common area sensor applications. When a product is present, it blocks one or more beams; when it is missing, the beams remain unblocked and the PLC detects the condition.
The DPB-1220-NPN-NC with 12 beams at 20 mm pitch can detect missing products of different sizes and positions within the 220 mm detection field, as long as the product height interrupts at least one beam.
Does a safety light curtain require a safety relay?
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It depends on the safety architecture and the machine risk assessment. In many machine protection applications, a safety relay or safety controller is used between the light curtain and the machine contactors to provide dual-channel monitoring, self-checking and safe stop functions.
The DPB-1220-NPN-NC provides an NPN NC output that can be connected directly to a PLC or controller. For higher safety integrity applications, integrating a dedicated safety relay or safety PLC is recommended. Contact DAPPRA to discuss the specific control architecture.
How do I install and align a safety light curtain?
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Install the emitter and receiver on rigid brackets at both ends of the housing, keeping them parallel and facing each other. Confirm that the housing cross section (14.5 × 28 mm for the DPB-1220-NPN-NC) fits the mounting space and that cables are routed away from high-voltage lines.
Power on the sensor and observe the alignment indicator. Adjust the position of one or both units until all beams are detected without interruption. After alignment, tighten all mounting screws and recheck the output status.
How do I align the emitter and receiver of a light curtain?
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Loosen the mounting brackets slightly so the units can be adjusted, then align the emitter and receiver so their optical axes are parallel and directly facing each other. Check the alignment indicator on the receiver or output signal to confirm all beams are received.
Adjust in both horizontal and vertical directions. Once all beams are aligned and stable, tighten the brackets firmly. The DPB Series uses line synchronization, so the emitter and receiver must be correctly aligned before the output becomes stable.
Why is my safety light curtain always triggered?
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If the output stays in the triggered state, the most likely causes are misalignment, obstruction in the beam path, contamination on the lens, incorrect wiring of the NC output, or unstable power supply.
Check that the emitter and receiver are properly aligned, that no object interrupts the beams, that the lenses are clean, and that the DC24V supply is stable. Also verify the NPN NC output wiring and confirm the PLC or controller input polarity.
Why are the emitter and receiver not communicating?
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No communication between emitter and receiver usually indicates a power supply problem, incorrect wiring, wrong synchronization mode, or serious misalignment. Confirm that both units are powered by DC24V ±20% and that the line synchronization wires are correctly connected.
Also verify that the emitter and receiver are the matching pair from the same DPB Series set, and that the distance between them is within the 0.1–3 m detection range. If the output still fails, contact DAPPRA for support.
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