An automatic sliding door sensor wiring diagram shows how sensors connect to the door controller, including power, activation, safety/presence and, where supported, monitoring or test functions. However, there is no single wiring layout that applies to every automatic sliding door sensor.
Sensor manufacturers such as BEA, Optex and Hotron can use different terminal configurations, wire colours and monitoring systems. For this reason, the exact wiring diagram supplied with the sensor and automatic door operator should always be used as the primary reference.
Understanding the basic wiring structure can help identify the role of each connection and troubleshoot common sensor problems without assuming that one configuration works for every system.
- Standard Power Requirements: Many commercial automatic-door sensors use low-voltage AC or DC power, but the exact voltage range must be verified against the sensor and controller specifications before connection.
- The “4-Wire” vs. “6-Wire” Setup: Basic configurations may provide power and relay connections, while additional conductors can be used for safety, monitoring or test functions depending on the sensor.
- Activation vs. Safety Terminals: Activation and presence-safety signals perform different functions and must be connected to the appropriate controller inputs.
- Common Color Coding (Standard Convention): Wire colours can provide a useful reference, but they are not universal across BEA, Optex, Hotron or other manufacturers. Always verify them against the model-specific wiring diagram.
- Monitoring (The “Test” Signal): Compatible monitored systems use communication between the controller and safety sensor to detect certain sensor or circuit faults. The required configuration depends on the door operator, sensor and applicable installation requirements.
How to Read an Automatic Sliding Door Sensor Wiring Diagram and System
The first step when reading an automatic sliding door sensor wiring diagram is to identify what each terminal is designed to do.
Most diagrams can be understood by separating the connections into four main categories:
- Power
- Activation
- Safety or presence
- Monitoring or test
The exact terminal names and arrangement vary between manufacturers and models.
A typical automatic sliding door system may contain:
- Door operator
- Door controller
- Activation sensor
- Presence/safety sensor
- Power supply
- Relay contacts
- Monitoring or test circuit
The sensor communicates with the door controller, while the controller processes the input and manages the door’s movement.
What Is the Door Controller?
The door controller is the central interface between the sensors and the automatic door operator. For a more detailed explanation of how the controller manages door inputs and operating functions, see Automatic Sliding Door Control Logic Explained
Depending on the system, it receives sensor signals and controls functions such as:
- Opening
- Closing
- Door movement
- Opening and closing speed
- Hold-open timing
- Safety responses
The sensor therefore forms part of a larger control system rather than operating the sliding door independently.
What Is an Activation Sensor?
An activation sensor detects a person or movement approaching the door and sends an opening request to the controller.
For example, a microwave or radar sensor may detect movement in front of the entrance. When the programmed activation condition is met, its output communicates with the door controller.
The controller then initiates the appropriate opening sequence.
What Is a Safety or Presence Sensor?
A presence sensor performs a different function.
Instead of simply detecting someone approaching the door, it monitors an area where a person or object could remain while the door is operating.
Depending on the system, the safety signal can:
- Prevent closing
- Keep the door open
- Modify the door’s operating response
Some combination sensors provide both activation and presence detection. A presence sensor performs a different function. Instead of simply detecting someone approaching the door, it monitors an area where a person or object could remain while the door is operating. This safety function is particularly important in applications such as healthcare and aged care, where automatic sliding doors for care can support accessibility and safer movement.
Because safety and presence functions are part of the safety-related control system, their design and integration should follow the requirements applicable to the complete door system.
1ISO — ISO 13849-1:2023 Safety of machinery — Safety-related parts of control systems. Date of access on 23/09/2026↓
What Are Power Terminals?
Power terminals supply the sensor with the electrical power required for operation.
Depending on the model, the sensor may require:
- AC power
- DC power
- A specific voltage range
- Correct DC polarity
Some automatic door controllers provide an auxiliary power output for compatible sensors.
The exact voltage and electrical requirements should always be checked in the manufacturer’s documentation rather than assumed from the number of wires.
What Do COM, NO and NC Mean?
Many automatic door sensors use relay contacts labelled COM, NO and NC.
- COM — Common: Shared relay terminal
- NO — Normally Open: Contact is open in its normal state
- NC — Normally Closed: Contact is closed in its normal state
These contacts can be used to communicate a sensor condition to the door controller.
However, the correct terminal arrangement depends on the specific sensor and controller.
What Are Activation Terminals?
Activation terminals are used to communicate an opening request from the activation sensor to the automatic door controller.
The sensor detects the programmed activation condition, changes its output state and the controller responds according to its configuration.
The exact terminals should be identified from the manufacturer’s diagram.
What Are Safety Terminals?
Safety terminals connect a compatible presence or safety sensor to the controller’s safety input.
When the safety detection area is occupied, the controller can use that information to prevent or modify a closing movement.
Because this is a safety-related function, installers should not treat safety terminals as interchangeable with ordinary activation inputs.
What Are Monitoring and Test Terminals?
Some automatic sliding door systems use monitored safety sensors.
A monitoring or test connection can allow the controller to check the status of a compatible sensor or safety circuit. For power-operated pedestrian doors, safety functions and testing should be considered as part of the complete door system. 2BSI — BS EN 16005:2023+A1:2024 Power operated pedestrian doorsets — Safety in use. Date of access on 23/09/2026↓
This can help identify certain faults before or during operation.
However, monitoring arrangements are highly dependent on the sensor and controller combination. A monitoring connection from one manufacturer should not automatically be applied to another system.
4-Wire vs 6-Wire vs 8-Wire Automatic Door Sensors
The main difference between 4-wire, 6-wire and 8-wire automatic door sensors is the number of available connections and the functions they can support. However, wire count alone does not determine a sensor’s capabilities, so the exact model specifications should always be checked.
| Configuration | Typical Connections | Functions | Monitoring / Safety | Complexity |
| 4-Wire | Power + basic relay | Basic activation | Usually limited | Low |
| 6-Wire | Power + relay + additional connections | Activation + additional functions | May support safety or monitoring | Moderate |
| 8-Wire | Power + multiple outputs | Multiple activation, safety or control functions | May support advanced monitoring | Higher |
4-Wire vs 6-Wire vs 8-Wire: Key Differences
4-Wire sensors generally provide a simpler connection arrangement for basic power and relay communication. They are suitable for systems that require fewer sensor functions.
6-Wire sensors provide additional connections that may support separate outputs, safety functions or monitoring, depending on the model.
8-Wire sensors can provide more connections for multiple outputs, detection functions, monitoring or test features. They are typically used in systems with more complex sensor requirements.
The important distinction is that a higher wire count does not automatically mean better sensor performance. The additional conductors simply allow the sensor to support more functions when those functions are available in the specific model.
When comparing sensors, check the automatic sliding door sensor wiring diagram for the exact model rather than choosing based on wire count alone.
Microwave vs Infrared Automatic Door Sensor Wiring
Microwave and infrared sensors serve different roles in automatic sliding door systems. Microwave sensors are commonly used for activation, while infrared sensors are often used for presence and safety detection. The wiring depends on the sensor model and the door controller.
| Feature | Microwave Sensor | Infrared Sensor |
| Main function | Activation | Presence / safety detection |
| Detection | Approaching movement | Person or object within a defined zone |
| Typical location | In front of the door | Around the threshold / safety area |
| Controller signal | Activation request | Safety / presence signal |
| Common purpose | Opens the door | Helps prevent unsafe closing |
| Wiring | Power + activation output/relay | Power + safety/presence output |
| Configuration | Depends on sensor and controller | Depends on sensor and controller |
How Are Microwave Activation Sensors Connected?
Microwave sensors use radar technology to detect approaching movement. When movement is detected within the configured activation area, the sensor sends an activation request to the door controller.
Typical connections may include power and an activation output or relay such as COM, NO or NC, depending on the model.
How Are Infrared Presence Sensors Connected?
Infrared sensors detect people or objects within a defined presence zone, particularly around the door threshold. Their output communicates the detected presence to the appropriate safety input on the controller.
This allows the automatic door system to respond appropriately when the detection area is occupied.
What About Combination Sensors?
Some modern sensors combine microwave activation and infrared presence detection in one unit. Depending on the model, they may also provide multiple detection zones or monitoring functions.
Because the terminal layout and functions vary between products, always use the exact automatic sliding door sensor wiring diagram supplied by the manufacturer.
What Is the Correct Automatic Door Sensor Installation Process?
The correct installation process starts with identifying the exact sensor and controller specifications. A generic automatic sliding door sensor wiring diagram should not replace the documentation supplied with the actual equipment.
Step 1 — Identify the Sensor and Controller Specifications
Before installation, verify:
- Sensor model
- Controller model
- Supply requirements
- Terminal functions
- Monitoring compatibility
This information determines which wiring arrangement is appropriate for the system.
Step 2 — Confirm Power Compatibility
The sensor’s voltage and current requirements must match the available power source or compatible controller output.
Check:
- Required voltage
- AC or DC supply
- Current requirements
- Polarity where applicable
- Controller auxiliary output specifications
A sensor should not be connected simply because another sensor previously used the same controller connection.
Step 3 — Identify Activation and Safety Inputs
Activation and safety inputs perform different functions.
The activation input communicates an opening request, while the safety/presence input communicates information about people or objects in the monitored area.
These connections should be identified from the manufacturer’s documentation and should never be bridged or bypassed simply to make the door operate.
Step 4 — Configure Monitoring Where Required
Some sensors and controllers support monitored safety functions.
Where monitoring is required, the sensor and controller must be compatible and configured according to the manufacturer’s instructions.
Monitoring connections can vary considerably between models, so a generic diagram should not be assumed to apply.
Step 5 — Test the Complete Door System
After installation or sensor replacement, test the complete automatic sliding door system.
Testing should include:
- Activation
- Presence detection
- Closing protection
- Monitoring where applicable
- Detection area
- Overall door operation
The objective is to confirm that the sensor, controller, operator and safety functions work together correctly. Regular testing and maintenance are also important for long-term performance. See How to Maintain Automatic Sliding Doors for Long-Term Performance for additional maintenance guidance
Why Is My Automatic Sliding Door Sensor Not Working?
A sensor that is not working correctly may have a power, configuration, detection, positioning or controller-related problem. Understanding the relationship between sensors and the controller can help identify whether the issue is related to the sensor input or the wider control system. See Automatic Sliding Door Control Logic Explained
Why Won’t the Automatic Door Open?
When a door fails to open as a pedestrian approaches, inspect the following technical causes:
- No Sensor Power: Check the primary $12\text{–}24\text{ V AC/DC}$ power feed from the controller’s auxiliary output terminals (AUX Power). An unpowered sensor PCB or dark LED indicates a blown fuse, tripped breaker, or severed wire conductor.
- Incorrect Operating Mode: Key switches, mode selectors, or digital wall switches may be set to “Hold Closed,” “Exit Only,” or “Off,” causing the MCU to ignore activation signals.
- Activation Signal Problem (Relay Failure): The sensor’s detection field triggers (LED changes color), but no dry-contact signal reaches the controller due to loose terminals or wiring errors on Common ($COM$) / Normally Open ($N.O.$) connections.
- Incorrect Configuration: Sensitivity controls or radar potentiometer settings are set too low, requiring a person to stand extremely close before triggering.
- Controller Fault (MCU Issue): The main control board has frozen, suffered an input port failure, or registered a permanent safety circuit error.
Why Won’t the Automatic Sliding Door Close?
If the door opens but remains stuck permanently in the held-open state:
- Presence Zone Continuously Occupied: The active infrared (AIR) safety curtain detects an object, a threshold obstruction, or strong optical reflections off a polished floor.
- Safety Sensor Detection: Photoelectric safety beams or side-screen safety sensors are misaligned, dirty, or obstructed by static objects.
- Incorrect Configuration (Inverted Relay): Wiring a sensor’s Normally Closed ($N.C.$) contact instead of Normally Open ($N.O.$) tells the controller that an object is present when the sensor is actually at rest.
- Monitoring Fault Lockout: Under EN 16005 safety protocols, the controller transmits a self-test pulse to the sensor before every closing cycle. If the sensor fails the self-test or lacks a compatible monitoring input, the MCU defaults to a fail-safe hold-open state.
- Sensor Alignment Issue: The sensor head is tilted too far inward toward the threshold, causing the safety curtain to detect the door frame or surrounding fixtures.
Why Does the Door Keep Opening and Closing by Itself?
Repeated or unexpected self-cycling is known as sensor “ghosting” and is typically caused by:
- Excessive Sensitivity: The radar/microwave pattern is set too wide or deep, detecting distant hallway traffic, passing vehicles, or side movement.
- Sensor Detecting Moving Door Leaves: The sensor head is angled too steeply downward, causing its microwave field to clip the door panels as they close. The controller misinterprets the door panel’s movement as an approaching person and instantly re-opens the door.
- Header / Mechanical Vibration: Loose motor mounts or flexing in the door header transfer vibrations directly into the sensor module during panel movement, triggering false motion signals.
- Environmental Interference: High-velocity air currents from HVAC vents / air curtains, fluttering draft curtains, heavy rain/snow, or flickering fluorescent lighting within the detection field.
- Power Instability: Voltage drops on the auxiliary power supply when the motor starts up, causing the sensor to reboot and send a false activation signal.
Why Is the Sensor Showing an Error or Flashing LED?
LED colors and flashing patterns are manufacturer- and model-specific. There is no universal meaning for a particular LED color across all automatic door sensors.
Real-World Examples:
- BEA Sensors: Solid green typically indicates standby/rest, solid red indicates motion activation, and flashing red/orange signals self-test errors or safety curtain obstructions.
- Optex Sensors: Flashing color combinations (green, red, orange) indicate background learning phases, optical reflection overload, or monitoring line faults.
Best Practice: Always consult the exact troubleshooting table in the installation manual for your specific sensor model.
Why Does the Door Stay Open After Replacing the Sensor?
When replacing an old sensor with a new model and the door remains stuck open:
- Monitoring Incompatibility: The replacement sensor lacks the active monitoring handshake required by the existing door operator, or the monitoring dip-switches are misconfigured.
- Incorrect Sensor Configuration: Output logic settings (Active High vs. Active Low, or Fail-Safe vs. Fail-Secure) on the new PCB do not match the MCU requirements.
- Safety Input Remaining Active: The new sensor has a more sensitive infrared curtain that detects background reflections from the floor that need to be re-calibrated.
- Controller Requiring Setup or Re-Learn: Advanced door operators (such as Dorma, Besam, or Stanley) require a manual system reset or calibration run after replacing peripheral hardware.
- Replacement Sensor Incompatible with the Operator: Current draw exceeds auxiliary power capacity, or signal output parameters are mismatched.
Automatic Sliding Door Sensor Wiring Problems and Solutions
A comparison/troubleshooting table will work well here.
| Problem | Possible Cause | What to Check |
| Sensor has no power | Supply or connection issue | Power specification and controller output |
| Door won’t open | Activation signal issue | Sensor status and controller input |
| Door won’t close | Safety input active | Detection zone and sensor configuration |
| Door repeatedly cycles | Sensor interference | Position, sensitivity and environment |
| Monitoring error | Compatibility/configuration | Sensor and controller documentation |
| Sensor works intermittently | Connection/power issue | Wiring condition and power stability |
What Safety Standards Apply to Automatic Sliding Door Sensors?
Automatic sliding door sensors are evaluated not in isolation, but as part of the complete automatic pedestrian door system. Because commercial door panels can weigh well over 100kg, their sensors act as both operational triggers and life-safety systems designed to prevent impact, entrapment, and crush injuries.
Primary Regional & International Standards:
- EN 16005 / BS EN 16005 (Europe & UK): Mandatory standard for power-operated pedestrian doors. Requires Monitored Safety Loops where the controller sends a self-test pulse to the safety sensors before every closing cycle. Safety functions must meet Performance Level ‘c’ (PL c) under ISO 13849-1.
- ANSI / BHMA A156.10 (North America): Covers full-power commercial automatic sliding doors. Mandates specific motion pattern dimensions (approach zones) and continuous presence sensing across the full opening width and threshold.
- AS 5007 (Australia & New Zealand): Governs design, installation, and safety requirements. Works alongside accessibility standards (AS 1428.1) to ensure adequate hold-open timing and presence protection for mobility-impaired individuals.
Core Functional Requirements Mandated by Standards:
- Active Presence Protection (Threshold Safety): Active Infrared (AIR) safety curtains or photoelectric beams must detect a stationary person standing directly in the door panel path to prevent crush or impact injuries.
- Monitored Self-Testing: The sensor’s safety circuit must actively communicate its operational status to the Main Control Unit (MCU). Unmonitored legacy sensors are non-compliant under current safety frameworks.
- Fail-Safe / Emergency Egress: Upon loss of power, primary sensor wire damage, or internal system failure, sensors on emergency escape routes must allow the door to open or break away (swing out) safely.
Automatic sliding door sensors should therefore be considered as part of the complete door safety system rather than as isolated components. For a broader overview of automatic door safety requirements, see Automatic Door Compliance
Are Automatic Door Sensor Wire Colours Universal?
No. Automatic door sensor wire colours are not universal. Manufacturers may use similar colour conventions, but installers should always verify each conductor against the sensor’s wiring diagram and controller documentation.
Common Sensor Wire Functions
| Wire Function | Common Example | Purpose | Important Note |
| Power | Red / Black | Supplies sensor power | Colours vary |
| Activation relay | White / Green | Sends activation signal | Verify COM/NO/NC |
| Safety relay | Varies | Sends presence/safety status | Model-specific |
| Monitoring/Test | Varies | Supports monitored operation | Controller compatibility required |
Note: This table should be treated as a general reference only, not as a wiring instruction for a specific sensor.
Why Shouldn’t You Wire a Sensor Based on Colour Alone?
Cover risks such as:
- Incorrect voltage
- Wrong relay connection
- Controller faults
- Sensor malfunction
- Loss of safety functionality
FAQs
Ghosting occurs when environmental factors or mechanical movement continuously re-trigger the sensor. The most common cause is steep sensor angle alignment, which causes the radar or infrared field to clip the moving door leaves, misinterpreting panel movement as an approaching pedestrian. Additional causes include header vibration transferring movement directly into the sensor head, air currents from nearby HVAC vents, moving draft curtains, falling precipitation, flickering fluorescent lights, or highly reflective flooring within the detection zone.
No, wire colors are not standardized across manufacturers, and relying on them is a frequent installation error. While many common 4-wire systems (such as BEA or Optex) use red and black for power alongside white and green for relay activation, European or 5-wire configurations often use brown, blue, black, grey, and white for power and relay logic (N.O., N.C., COM). Technicians must always verify terminal legends printed directly on the sensor housing or PCB rather than relying on wire jacket colors.
Yes, standard commercial door operators (such as Dorma, Besam/Assa Abloy, Stanley, or Nabco) include dedicated 12-24 V AC/DC auxiliary power terminals designed specifically for external sensors and accessories. However, installers must verify that the cumulative current draw (mA) of all connected accessories does not exceed the controller’s maximum auxiliary output limit, which typically ranges between 100 mA and 500 mA.
A door locked in the open state indicates that the controller is receiving a continuous activation or safety trip signal. This is most frequently caused by wiring to a Normally Closed ($N.C.$) relay output instead of a Normally Open ($N.O.$) contact, misconfiguring output logic DIP switches (e.g., Active High vs. Active Low or Fail-Safe modes), or an active infrared presence curtain being constantly tripped by floor reflections, misaligned tilt angles, or static threshold obstacles.
Exact wiring schematics can be found printed directly inside the removable sensor faceplate or on the PCB terminal legend. For complete system integration, installers should consult the official installation manuals for both the sensor model (e.g., BEA IXIO, Optex OA-Axis) and the door operator (e.g., Dorma ES200, Besam Unislide) to correctly pair activation, safety, monitoring, and power terminals.
Final Thoughts
An automatic sliding door sensor wiring diagram explains how sensors communicate with the door controller, but there is no universal wiring configuration for every automatic sliding door.
BEA, Optex, Hotron and other manufacturers may use different power, relay, safety and monitoring configurations. The exact manufacturer documentation should therefore always take priority.
Check the Diagram → Verify Compatibility → Test the Safety Functions
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