Configured for guard-door interlocking and lock-status monitoring, the Omron D4BL-1CRA (D4BL Guard Lock Safety-Door Switch) provides hardwired contact switching for door position and locking-state detection. It uses a mechanical locking mechanism with 24 VDC solenoid release.

Configuration Details

The D4BL-1CRA is configured with a two-conduit arrangement using PG13.5 conduit entries. Its built-in switch provides separate contacts for door open/closed detection and lock monitoring. The switch head supports four mounting directions, with right-side mounting as the shipping configuration.

Switching and Lock Monitoring

The D4BL-1CRA uses mechanical contacts for the safety-door switching functions. The 1NC/1NO slow-action contact arrangement provides door open/closed detection, while the additional 1NC slow-action contact is assigned to lock monitoring.

The mechanical lock retains the actuator when the guard is in the locked condition. Release is controlled through the 24 VDC solenoid circuit. The auxiliary release key is incorporated into the switch assembly for manual release where required by the installation.

PLC and Safety Control Interface

The D4BL-1CRA does not provide a fieldbus or digital communication interface. Its status signals are transferred through hardwired contacts to an external safety relay, safety controller, or compatible control circuit.

When connected to a PLC-based safety system, the door-status and lock-monitoring contacts should be assigned to inputs suitable for the required safety architecture. The contact states should be evaluated according to the machine safety circuit design rather than treated as ordinary process I/O.

Ordering Information

• 1 x Omron D4BL-1CRA Guard Lock Safety-Door Switch
• 1 x Integrated auxiliary release mechanism
• 1 x D4BL switch assembly with PG13.5 conduit configuration
• Indicator not included

Installation Requirements

• Install the switch body and actuator with the actuator aligned to the insertion axis.
• Prevent lateral force, bending force, or excessive mechanical impact on the actuator during guard operation.
• Use suitable PG13.5 conduit fittings and sealing components to maintain the specified IP67 protection.
• Keep safety contact wiring separated from high-current conductors and significant electrical noise sources where installation conditions permit.
• Connect the door-status and lock-monitoring contacts according to the approved machine safety circuit.
• Provide the specified 24 VDC solenoid release circuit through an appropriate control device.
• Confirm correct actuator engagement before operating the guard-lock mechanism.
• Verify door detection, lock monitoring, mechanical locking, and solenoid release after installation.
• The complete safety function must be validated as part of the machine-level safety circuit.

Technical FAQ

• What is the locking principle of the D4BL-1CRA?

  The D4BL-1CRA uses mechanical locking. The guard is released electrically through its 24 VDC solenoid release mechanism.

• What contacts are provided?

  The built-in switching arrangement consists of 1NC/1NO slow-action contacts plus 1NC slow-action contact for door and lock monitoring functions.

• What conduit specification is used?

  The D4BL-1CRA uses a two-conduit configuration with PG13.5 conduit entries.

• Can the switch head orientation be changed?

  Yes. Four head mounting directions are possible. The specified shipping configuration uses right-side mounting.

• What is the enclosure protection rating?

  The specified protection rating is IP67 according to EN 60947-5-1, subject to correct installation of the associated conduit and sealing components.

• What is the operating speed range?

  The specified operating speed is 0.05 to 0.5 m/s. The actuator should remain properly aligned throughout its movement.

• What is the mechanical durability?

  Mechanical durability is specified as a minimum of 1,000,000 operations. Electrical durability is 500,000 operations under the specified 10 A resistive load at 250 VAC.

• Does this model include an indicator?

  No. The D4BL-1CRA is specified without an indicator. Door and lock states are monitored through the integrated switching contacts.