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DRM-0840-R Relay Safety Light Curtain Industrial Area Sensor
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DAPPRA DRM-0840-R is an 8-beam Relay Safety Light Curtain for machinery protection with 40 mm optical axis pitch and 280 mm protection height. Separate emitter and receiver units, 30 × 35 mm aluminium alloy housing, 350 mm total height, relay output (COM / NC / NO), ≤5 ms response time, IP65 protection, designed for pressing, cutting, extrusion and small-to-medium machinery safety applications.
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✦ Relay Safety Light Curtain
Machinery Protection
Relay Output
IP65
DRM-0840-R
Relay Safety Light Curtain for Machinery Protection · 8-Beam · 40 mm Pitch · 280 mm Protection Height
The DAPPRA DRM-0840-R is an eight-beam Relay Safety Light Curtain designed for machinery safety protection in automation equipment and small to medium-sized machinery.
It uses separate EMITTER and RECEIVER units to provide a 280 mm protection height, with a 30 × 35 mm aluminium alloy housing and an internal vibration-resistant structure, relay output and a ≤5 ms response time.
Its relay output provides isolated common, normally-closed and normally-open contacts for direct switching of machine control circuits, with an operating voltage of DC 10–30 V.
Primary Product Classification: Relay Safety Light Curtain.
Related Industry Terminology: Safety Light Curtain / Industrial Area Sensor / Machine Guarding.
Product Overview
DAPPRA DRM-0840-R is an eight-beam Relay Safety Light Curtain designed for machinery safety protection, automation equipment and small to medium-sized machinery. It uses separate EMITTER and RECEIVER units to provide a 280 mm protection height, with a 30 × 35 mm aluminium alloy housing, relay output and a ≤5 ms response time.
The DRM Series uses Multiple Parallel Beam Through-Beam Detection Technology and adopts relay output with isolated common, normally-closed and normally-open contacts for direct switching of machine control circuits. It supports 20 mm and 40 mm optical-axis pitch configurations for machinery protection applications.
The DRM-0840-R is suitable for machine protection, personnel protection, pressing equipment, cutting equipment, extrusion equipment and general industrial automation applications.
DRM-0840-R Key Features
- Relay Output (Common / NC / NO)
- 30 × 35 mm Aluminium Alloy Housing
- 8 Optical Beams
- 40 mm Optical-Axis Pitch
- 280 mm Protection Height
- 350 mm Total Height
- Vibration-Resistant Internal Structure
- ≤5 ms Response Time
- 0.1–3 m Standard Detection Distance
- DC 10–30 V Wide Working Voltage
- ≤200 mA Output Current · <5 W Power Consumption
- IP65 Protection Rating
- Line Synchronization
- Complete Self-Checking Function
- Integrated Protection Circuitry
- Side Mounting / Cantilever Mounting Options
Relay Output Design with Vibration Resistance
The DRM Series adopts a relay output architecture with isolated common, normally-closed and normally-open contacts. This allows the light curtain to switch the machine control circuit directly without an additional interface, which simplifies wiring and improves reliability in industrial environments. The operating voltage is DC 10–30 V with an output current of ≤200 mA and power consumption of <5 W.
The product uses a 30 × 35 mm aluminium alloy housing with an internal vibration-resistant structure. Combined with complete self-checking functions and integrated protection circuitry (power over-voltage protection, reverse-polarity protection, output over-current protection), this design supports stable detection on pressing, cutting and extrusion machines where vibration is continuous.
The DRM Series focuses on achieving a balance between relay output simplicity, vibration resistance and machinery safety.
Product Specifications
| Parameter | DRM-0840-R |
|---|---|
| Product Series | DRM Series |
| Product Type | Relay Safety Light Curtain |
| SKU | OL11 |
| Optical Beam Quantity | 8 Beams |
| Optical-Axis Pitch | 40 mm |
| Protection Height | 280 mm |
| Total Height | 350 mm |
| Resolution | 40 mm |
| Housing Cross Section | 30 × 35 mm (Aluminium Alloy) |
| Response Time | ≤5 ms |
| Detection Distance | 0.1–3 m (Standard) / longer on request |
| Operating Voltage | DC 10–30 V |
| Output Type | Relay Output |
| Relay Contacts | Common / Normally-Closed / Normally-Open |
| Output Current | ≤200 mA |
| Power Consumption | <5 W |
| Protection Circuitry | Power over-voltage / reverse-polarity / output over-current |
| 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°) |
| Cable Length | 3 m (Standard) / Custom Available |
| Mounting | Side Mounting / Cantilever |
Optical Detection Structure
The DRM-0840-R uses separate EMITTER and RECEIVER units to create a parallel infrared detection field.
The 8 optical beams are arranged with a 40 mm optical-axis pitch, providing a 280 mm protection height.
EMITTER → Parallel Infrared Beams → RECEIVER → RELAY OUTPUT (COM / NC / NO)
When an object or person interrupts the infrared beam path, the receiver detects the change in the optical field and switches the corresponding relay output (common, normally-closed, normally-open contacts) to control the machine stop circuit.
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 DRM-0840-R is designed as a Relay Safety Light Curtain for machinery protection, using isolated relay output for direct switching of machine control circuits. The appropriate safety configuration and integration should be determined according to the machine risk assessment and applicable safety requirements.
Relay Safety Light Curtain for Machinery Protection
Fast ≤5 ms Response
With a response time of ≤5 ms, the DRM-0840-R 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 complete self-checking function, the DRM Series supports reliable machine protection in vibration-heavy industrial environments.
IP65 Protection for Industrial Environments
The DRM-0840-R 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°).
Relay Output
The DRM-0840-R uses relay output with isolated common, normally-closed and normally-open contacts for direct switching of machine control circuits. This eliminates the need for an additional output interface and simplifies integration with machine control systems.
The relay contacts are rated for ≤200 mA output current, with an operating voltage of DC 10–30 V and power consumption of <5 W.
DRM-0840-R Model Information
The model number identifies the DRM Series configuration, beam quantity, optical-axis pitch and output type.
Model Code
DRM
-
08
40
-
R
DRM
Series prefix — DAPPRA DRM Series Relay Safety Light Curtain.
08 — Beam Quantity
Number of optical beams. This model uses 8 optical beams.
40 — Optical-Axis Pitch
Optical-axis pitch in mm. This model uses 40 mm beam spacing.
R — Output Type
R = relay output. The DRM Series uses relay output as standard.
Field
Meaning
Value
DRM
Series prefix
DRM
Beam Quantity
Number of optical beams
08
Optical-Axis Pitch
Distance between adjacent optical axes
40 mm
Output Type
Relay output
R
Example: DRM-0840-R = DRM Series, 8 beams, 40 mm optical-axis pitch, relay output.
Dimensions
The DRM-0840-R features a 30 × 35 mm aluminium alloy housing with a 280 mm protection height and 350 mm total height.
Key dimensions:
- Housing Cross Section: 30 × 35 mm
- Optical-Axis Pitch: 40 mm
- Protection Height: 280 mm
- Total Height: 350 mm
Installation Method
The DRM Series supports multiple mounting configurations for different machinery structures. Standard side mounting brackets are included, with cantilever brackets available as options.
The 30 × 35 mm aluminium alloy housing provides a stable mounting base while maintaining the internal vibration-resistant structure required for machinery protection environments.
The EMITTER and RECEIVER should be securely installed and accurately aligned to ensure reliable infrared detection.
- Side Mounting Brackets — Standard side mounting with side-fixing brackets and M5 sliding blocks
- Cantilever Brackets — Extended mounting positions with rotary arm and cantilever support rod
DRM Series Model Selection
The DRM Series provides different beam quantities, optical-axis pitches and protection heights for different machinery protection requirements.
For the DRM-0840-R:
DRM-0840-R → 8 Beams · 40 mm Optical-Axis Pitch · 280 mm Protection Height · 350 mm Total Height · Relay Output
For the complete DRM Series model selection table, including different beam quantities, optical-axis pitches and protection heights, please visit the DRM Series page. [VIEW DRM SERIES MODEL SELECTION →]
Wiring & Relay Contacts
The DRM-0840-R uses relay output at DC 10–30 V. The receiver provides a sync port and a 5-wire output port for connection to the machine control circuit. The relay contacts (common, normally-closed, normally-open) switch the machine control circuit directly.
Before connection, verify the relay contact wiring and the input configuration of the machine control system.
| Electrical Configuration | Specification |
|---|---|
| Operating Voltage | DC 10–30 V |
| Output Type | Relay Output |
| Relay Contacts | Common / Normally-Closed / Normally-Open |
| Output Current | ≤200 mA |
| Power Consumption | <5 W |
| Synchronization | Line Synchronization |
| Control Interface | Direct switching of machine control circuits via relay contacts |
Wire Colour Reference
| Port | Function | Wire Colour |
|---|---|---|
| Emitter | Sync CP | Black (BK) |
| Receiver — Port 1 | Sync CP | Black (BK) |
| Receiver — Port 2 (5-wire output port) |
+24 VDC | Brown (BN) |
| 0 V | Blue (BU) | |
| Common Terminal | White (WH) | |
| Normally Closed | Grey (GY) | |
| Normally Open | Black (BK) |
Controller Options
The DRM 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 DRM 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
- Material Detection
- Assembly Stations
Equipment and Machinery Applications
- Pressing Equipment
- Cutting Equipment
- Extrusion Equipment
- Automation Equipment
- Small & Medium Machinery
- Hydraulic Machinery
- Robotic Equipment
FAQ
Common questions about safety light curtain machine stop circuits, installation, and troubleshooting.
Can a safety light curtain directly stop a machine?
+
Yes. The DRM-0840-R provides an isolated relay output with common, normally-closed and normally-open contacts. These contacts can switch the machine's control circuit directly, so no additional output interface is required.
The relay contacts are rated for ≤200 mA at DC 10–30 V. For higher safety integrity applications, a safety relay or safety controller can be inserted between the light curtain and the machine contactors.
How do I connect a safety light curtain to an emergency stop circuit?
+
Connect the DRM relay contacts in series with the machine's emergency stop circuit or safety relay input. When a beam is interrupted, the relay changes state and the machine stops.
Verify the voltage and current rating of the e-stop circuit, confirm whether the normally-closed or normally-open contact is required, and ensure the final wiring follows the machine risk assessment and applicable safety standards.
Can a safety light curtain be used on an automated production line?
+
Yes. Safety light curtains are widely used on automated production lines for machine access protection, operator safety, material presence detection and process monitoring.
The DRM-0840-R provides a 280 mm protection height with 8 beams at 40 mm pitch, suitable for medium-sized openings on production-line machines. Its relay output allows direct integration into line control systems.
Can a safety light curtain be used on a bending machine?
+
Yes. Bending machines are a common application for safety light curtains. The light curtain monitors the operator access area and stops the machine when a hand or body part enters the hazardous zone.
The DRM-0840-R's relay output simplifies connection to the bending machine's control circuit. Safety distance and protection height should be determined according to the machine risk assessment and applicable safety standards.
What should I consider when installing a safety light curtain?
+
Key installation considerations include: safety distance from the hazard, protection height covering the full opening, correct alignment between emitter and receiver, secure mounting to avoid vibration drift, and cable routing separated from high-voltage lines.
For the DRM-0840-R, use the standard side mounting or cantilever brackets, keep the emitter and receiver parallel, and verify the relay contact wiring before powering the machine.
What power supply does a safety light curtain require?
+
The DRM-0840-R operates on a wide DC 10–30 V supply, with power consumption below 5 W. A regulated DC power supply or machine control power source is suitable.
The unit includes built-in protection against power over-voltage, reverse polarity, and output over-current. Before connection, confirm that the supply voltage and current are within the specified range.
What is the difference between detection distance and safety distance?
+
Detection distance is the physical range between the emitter and receiver where the light curtain can reliably detect an object (0.1–3 m for the DRM-0840-R).
Safety distance is the minimum distance between the light curtain and the machine hazard required so the machine can stop before a person reaches the hazard. It is calculated from the machine stopping time, the light curtain response time, resolution and approach speed according to standards such as ISO 13855.
How do I protect a safety light curtain from environmental interference?
+
The DRM Series has strong resistance to interference, with light interference resistance up to 10,000 Lux (incident angle > 5°). To further protect the light curtain:
Route signal cables away from high-power cables, use a stable power supply, avoid direct strong light sources pointed at the receiver, keep the lenses clean, and mount the units on rigid brackets to prevent vibration drift.
Why is my safety light curtain not working?
+
If the light curtain does not turn on or does not switch output, check: power supply voltage and polarity, cable connections on the emitter and receiver, sync cable between the two units, and whether the lens is blocked or dirty.
For the DRM-0840-R, verify that the DC 10–30 V supply is within range, that the emitter and receiver are correctly aligned, and that the relay contact wiring matches the machine input. If the unit still fails, contact DAPPRA for support.
Why is my safety light curtain giving a false alarm?
+
False alarms are 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 power supply is stable. The DRM-0840-R's self-checking function and line synchronization help reduce false alarms in most industrial environments.
Why is my safety light curtain not detecting objects?
+
If the light curtain does not detect objects, check: object size relative to the 40 mm beam spacing, alignment of emitter and receiver, and whether the object actually interrupts a beam path.
The DRM-0840-R uses 40 mm spacing, so objects smaller than about 40 mm may pass between beams without triggering. For small-object detection, choose a model with smaller pitch such as 20 mm.
Why does my safety light curtain lose detection intermittently?
+
Intermittent detection loss is usually caused by loose mounting brackets, vibration drift, marginal alignment, or intermittent power supply.
For the DRM-0840-R, retighten the mounting brackets, confirm that the emitter and receiver remain parallel, and verify that the DC 10–30 V power supply is stable. On machines with strong vibration, periodic rechecking of alignment is recommended.
How do I troubleshoot a safety light curtain?
+
Troubleshooting steps for the DRM-0840-R:
1) Confirm DC 10–30 V power at the emitter and receiver. 2) Check sync cable between the two units. 3) Verify alignment of emitter and receiver. 4) Inspect lenses for contamination. 5) Check the relay contact wiring and machine input. 6) Confirm no reflective object is near the beam path. 7) Verify that the safety distance is correct.
What should I check when a light curtain stops the machine unexpectedly?
+
When the machine stops unexpectedly, check whether the light curtain output actually triggered, or whether the machine stopped for another reason. Verify that nothing interrupts the beams (loose material, dust, or moving machine parts).
Also confirm the relay contact wiring, machine e-stop circuit, and power supply stability. If the light curtain itself is triggering without an object in the beam path, check alignment, lens contamination, and possible optical interference from nearby equipment.
Discover More
Explore the DAPPRA Relay Safety Light Curtain Series
View all DRM Series products and find the right solution for your machinery protection application.
View All SeriesNeed Help?
Need DRM-0840-R for Your Application?
Contact DAPPRA Automation for product specifications, relay contact wiring, technical documentation and purchasing support.
Contact DAPPRA EngineerRelated Technical Articles
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Related Technical Articles
✦ Relay Safety Light Curtain
Machinery Protection
Relay Output
IP65
DRM-0840-R
Relay Safety Light Curtain for Machinery Protection · 8-Beam · 40 mm Pitch · 280 mm Protection Height
The DAPPRA DRM-0840-R is an eight-beam Relay Safety Light Curtain designed for machinery safety protection in automation equipment and small to medium-sized machinery.
It uses separate EMITTER and RECEIVER units to provide a 280 mm protection height, with a 30 × 35 mm aluminium alloy housing and an internal vibration-resistant structure, relay output and a ≤5 ms response time.
Its relay output provides isolated common, normally-closed and normally-open contacts for direct switching of machine control circuits, with an operating voltage of DC 10–30 V.
Primary Product Classification: Relay Safety Light Curtain.
Related Industry Terminology: Safety Light Curtain / Industrial Area Sensor / Machine Guarding.
Product Overview
DAPPRA DRM-0840-R is an eight-beam Relay Safety Light Curtain designed for machinery safety protection, automation equipment and small to medium-sized machinery. It uses separate EMITTER and RECEIVER units to provide a 280 mm protection height, with a 30 × 35 mm aluminium alloy housing, relay output and a ≤5 ms response time.
The DRM Series uses Multiple Parallel Beam Through-Beam Detection Technology and adopts relay output with isolated common, normally-closed and normally-open contacts for direct switching of machine control circuits. It supports 20 mm and 40 mm optical-axis pitch configurations for machinery protection applications.
The DRM-0840-R is suitable for machine protection, personnel protection, pressing equipment, cutting equipment, extrusion equipment and general industrial automation applications.
DRM-0840-R Key Features
- Relay Output (Common / NC / NO)
- 30 × 35 mm Aluminium Alloy Housing
- 8 Optical Beams
- 40 mm Optical-Axis Pitch
- 280 mm Protection Height
- 350 mm Total Height
- Vibration-Resistant Internal Structure
- ≤5 ms Response Time
- 0.1–3 m Standard Detection Distance
- DC 10–30 V Wide Working Voltage
- ≤200 mA Output Current · <5 W Power Consumption
- IP65 Protection Rating
- Line Synchronization
- Complete Self-Checking Function
- Integrated Protection Circuitry
- Side Mounting / Cantilever Mounting Options
Relay Output Design with Vibration Resistance
The DRM Series adopts a relay output architecture with isolated common, normally-closed and normally-open contacts. This allows the light curtain to switch the machine control circuit directly without an additional interface, which simplifies wiring and improves reliability in industrial environments. The operating voltage is DC 10–30 V with an output current of ≤200 mA and power consumption of <5 W.
The product uses a 30 × 35 mm aluminium alloy housing with an internal vibration-resistant structure. Combined with complete self-checking functions and integrated protection circuitry (power over-voltage protection, reverse-polarity protection, output over-current protection), this design supports stable detection on pressing, cutting and extrusion machines where vibration is continuous.
The DRM Series focuses on achieving a balance between relay output simplicity, vibration resistance and machinery safety.
Product Specifications
| Parameter | DRM-0840-R |
|---|---|
| Product Series | DRM Series |
| Product Type | Relay Safety Light Curtain |
| SKU | OL11 |
| Optical Beam Quantity | 8 Beams |
| Optical-Axis Pitch | 40 mm |
| Protection Height | 280 mm |
| Total Height | 350 mm |
| Resolution | 40 mm |
| Housing Cross Section | 30 × 35 mm (Aluminium Alloy) |
| Response Time | ≤5 ms |
| Detection Distance | 0.1–3 m (Standard) / longer on request |
| Operating Voltage | DC 10–30 V |
| Output Type | Relay Output |
| Relay Contacts | Common / Normally-Closed / Normally-Open |
| Output Current | ≤200 mA |
| Power Consumption | <5 W |
| Protection Circuitry | Power over-voltage / reverse-polarity / output over-current |
| 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°) |
| Cable Length | 3 m (Standard) / Custom Available |
| Mounting | Side Mounting / Cantilever |
Optical Detection Structure
The DRM-0840-R uses separate EMITTER and RECEIVER units to create a parallel infrared detection field.
The 8 optical beams are arranged with a 40 mm optical-axis pitch, providing a 280 mm protection height.
EMITTER → Parallel Infrared Beams → RECEIVER → RELAY OUTPUT (COM / NC / NO)
When an object or person interrupts the infrared beam path, the receiver detects the change in the optical field and switches the corresponding relay output (common, normally-closed, normally-open contacts) to control the machine stop circuit.
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 DRM-0840-R is designed as a Relay Safety Light Curtain for machinery protection, using isolated relay output for direct switching of machine control circuits. The appropriate safety configuration and integration should be determined according to the machine risk assessment and applicable safety requirements.
Relay Safety Light Curtain for Machinery Protection
Fast ≤5 ms Response
With a response time of ≤5 ms, the DRM-0840-R 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 complete self-checking function, the DRM Series supports reliable machine protection in vibration-heavy industrial environments.
IP65 Protection for Industrial Environments
The DRM-0840-R 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°).
Relay Output
The DRM-0840-R uses relay output with isolated common, normally-closed and normally-open contacts for direct switching of machine control circuits. This eliminates the need for an additional output interface and simplifies integration with machine control systems.
The relay contacts are rated for ≤200 mA output current, with an operating voltage of DC 10–30 V and power consumption of <5 W.
DRM-0840-R Model Information
The model number identifies the DRM Series configuration, beam quantity, optical-axis pitch and output type.
Model Code
DRM
-
08
40
-
R
DRM
Series prefix — DAPPRA DRM Series Relay Safety Light Curtain.
08 — Beam Quantity
Number of optical beams. This model uses 8 optical beams.
40 — Optical-Axis Pitch
Optical-axis pitch in mm. This model uses 40 mm beam spacing.
R — Output Type
R = relay output. The DRM Series uses relay output as standard.
Field
Meaning
Value
DRM
Series prefix
DRM
Beam Quantity
Number of optical beams
08
Optical-Axis Pitch
Distance between adjacent optical axes
40 mm
Output Type
Relay output
R
Example: DRM-0840-R = DRM Series, 8 beams, 40 mm optical-axis pitch, relay output.
Dimensions
The DRM-0840-R features a 30 × 35 mm aluminium alloy housing with a 280 mm protection height and 350 mm total height.
Key dimensions:
- Housing Cross Section: 30 × 35 mm
- Optical-Axis Pitch: 40 mm
- Protection Height: 280 mm
- Total Height: 350 mm
Installation Method
The DRM Series supports multiple mounting configurations for different machinery structures. Standard side mounting brackets are included, with cantilever brackets available as options.
The 30 × 35 mm aluminium alloy housing provides a stable mounting base while maintaining the internal vibration-resistant structure required for machinery protection environments.
The EMITTER and RECEIVER should be securely installed and accurately aligned to ensure reliable infrared detection.
- Side Mounting Brackets — Standard side mounting with side-fixing brackets and M5 sliding blocks
- Cantilever Brackets — Extended mounting positions with rotary arm and cantilever support rod
DRM Series Model Selection
The DRM Series provides different beam quantities, optical-axis pitches and protection heights for different machinery protection requirements.
For the DRM-0840-R:
DRM-0840-R → 8 Beams · 40 mm Optical-Axis Pitch · 280 mm Protection Height · 350 mm Total Height · Relay Output
For the complete DRM Series model selection table, including different beam quantities, optical-axis pitches and protection heights, please visit the DRM Series page. [VIEW DRM SERIES MODEL SELECTION →]
Wiring & Relay Contacts
The DRM-0840-R uses relay output at DC 10–30 V. The receiver provides a sync port and a 5-wire output port for connection to the machine control circuit. The relay contacts (common, normally-closed, normally-open) switch the machine control circuit directly.
Before connection, verify the relay contact wiring and the input configuration of the machine control system.
| Electrical Configuration | Specification |
|---|---|
| Operating Voltage | DC 10–30 V |
| Output Type | Relay Output |
| Relay Contacts | Common / Normally-Closed / Normally-Open |
| Output Current | ≤200 mA |
| Power Consumption | <5 W |
| Synchronization | Line Synchronization |
| Control Interface | Direct switching of machine control circuits via relay contacts |
Wire Colour Reference
| Port | Function | Wire Colour |
|---|---|---|
| Emitter | Sync CP | Black (BK) |
| Receiver — Port 1 | Sync CP | Black (BK) |
| Receiver — Port 2 (5-wire output port) |
+24 VDC | Brown (BN) |
| 0 V | Blue (BU) | |
| Common Terminal | White (WH) | |
| Normally Closed | Grey (GY) | |
| Normally Open | Black (BK) |
Controller Options
The DRM 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 DRM 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
- Material Detection
- Assembly Stations
Equipment and Machinery Applications
- Pressing Equipment
- Cutting Equipment
- Extrusion Equipment
- Automation Equipment
- Small & Medium Machinery
- Hydraulic Machinery
- Robotic Equipment
FAQ
Common questions about safety light curtain machine stop circuits, installation, and troubleshooting.
Can a safety light curtain directly stop a machine?
+
Yes. The DRM-0840-R provides an isolated relay output with common, normally-closed and normally-open contacts. These contacts can switch the machine's control circuit directly, so no additional output interface is required.
The relay contacts are rated for ≤200 mA at DC 10–30 V. For higher safety integrity applications, a safety relay or safety controller can be inserted between the light curtain and the machine contactors.
How do I connect a safety light curtain to an emergency stop circuit?
+
Connect the DRM relay contacts in series with the machine's emergency stop circuit or safety relay input. When a beam is interrupted, the relay changes state and the machine stops.
Verify the voltage and current rating of the e-stop circuit, confirm whether the normally-closed or normally-open contact is required, and ensure the final wiring follows the machine risk assessment and applicable safety standards.
Can a safety light curtain be used on an automated production line?
+
Yes. Safety light curtains are widely used on automated production lines for machine access protection, operator safety, material presence detection and process monitoring.
The DRM-0840-R provides a 280 mm protection height with 8 beams at 40 mm pitch, suitable for medium-sized openings on production-line machines. Its relay output allows direct integration into line control systems.
Can a safety light curtain be used on a bending machine?
+
Yes. Bending machines are a common application for safety light curtains. The light curtain monitors the operator access area and stops the machine when a hand or body part enters the hazardous zone.
The DRM-0840-R's relay output simplifies connection to the bending machine's control circuit. Safety distance and protection height should be determined according to the machine risk assessment and applicable safety standards.
What should I consider when installing a safety light curtain?
+
Key installation considerations include: safety distance from the hazard, protection height covering the full opening, correct alignment between emitter and receiver, secure mounting to avoid vibration drift, and cable routing separated from high-voltage lines.
For the DRM-0840-R, use the standard side mounting or cantilever brackets, keep the emitter and receiver parallel, and verify the relay contact wiring before powering the machine.
What power supply does a safety light curtain require?
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The DRM-0840-R operates on a wide DC 10–30 V supply, with power consumption below 5 W. A regulated DC power supply or machine control power source is suitable.
The unit includes built-in protection against power over-voltage, reverse polarity, and output over-current. Before connection, confirm that the supply voltage and current are within the specified range.
What is the difference between detection distance and safety distance?
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Detection distance is the physical range between the emitter and receiver where the light curtain can reliably detect an object (0.1–3 m for the DRM-0840-R).
Safety distance is the minimum distance between the light curtain and the machine hazard required so the machine can stop before a person reaches the hazard. It is calculated from the machine stopping time, the light curtain response time, resolution and approach speed according to standards such as ISO 13855.
How do I protect a safety light curtain from environmental interference?
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The DRM Series has strong resistance to interference, with light interference resistance up to 10,000 Lux (incident angle > 5°). To further protect the light curtain:
Route signal cables away from high-power cables, use a stable power supply, avoid direct strong light sources pointed at the receiver, keep the lenses clean, and mount the units on rigid brackets to prevent vibration drift.
Why is my safety light curtain not working?
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If the light curtain does not turn on or does not switch output, check: power supply voltage and polarity, cable connections on the emitter and receiver, sync cable between the two units, and whether the lens is blocked or dirty.
For the DRM-0840-R, verify that the DC 10–30 V supply is within range, that the emitter and receiver are correctly aligned, and that the relay contact wiring matches the machine input. If the unit still fails, contact DAPPRA for support.
Why is my safety light curtain giving a false alarm?
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False alarms are 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 power supply is stable. The DRM-0840-R's self-checking function and line synchronization help reduce false alarms in most industrial environments.
Why is my safety light curtain not detecting objects?
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If the light curtain does not detect objects, check: object size relative to the 40 mm beam spacing, alignment of emitter and receiver, and whether the object actually interrupts a beam path.
The DRM-0840-R uses 40 mm spacing, so objects smaller than about 40 mm may pass between beams without triggering. For small-object detection, choose a model with smaller pitch such as 20 mm.
Why does my safety light curtain lose detection intermittently?
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Intermittent detection loss is usually caused by loose mounting brackets, vibration drift, marginal alignment, or intermittent power supply.
For the DRM-0840-R, retighten the mounting brackets, confirm that the emitter and receiver remain parallel, and verify that the DC 10–30 V power supply is stable. On machines with strong vibration, periodic rechecking of alignment is recommended.
How do I troubleshoot a safety light curtain?
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Troubleshooting steps for the DRM-0840-R:
1) Confirm DC 10–30 V power at the emitter and receiver. 2) Check sync cable between the two units. 3) Verify alignment of emitter and receiver. 4) Inspect lenses for contamination. 5) Check the relay contact wiring and machine input. 6) Confirm no reflective object is near the beam path. 7) Verify that the safety distance is correct.
What should I check when a light curtain stops the machine unexpectedly?
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When the machine stops unexpectedly, check whether the light curtain output actually triggered, or whether the machine stopped for another reason. Verify that nothing interrupts the beams (loose material, dust, or moving machine parts).
Also confirm the relay contact wiring, machine e-stop circuit, and power supply stability. If the light curtain itself is triggering without an object in the beam path, check alignment, lens contamination, and possible optical interference from nearby equipment.
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