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Controlling a Robotiq Gripper on FANUC CRX using the Teach Pendant and Karel Programs

Using TP and Karel routines to activate, move, and monitor your Robotiq gripper on FANUC CRX

This article explains how to control a Robotiq gripper connected to a FANUC CRX robot. Using Robotiq-provided KAREL and TP programs, you can activate the gripper, command it to open or close, move it to a custom position, and monitor its status. This guide is intended for advanced users working with Robotiq grippers on FANUC CRX robots who are already familiar with FANUC robot programming.

Prerequisites

Before starting, make sure the following requirements are met:

  • Robot type: Fanuc CRX series

    Gripper model: One of the following:

    • 2F-85 or 2F-140

    • Hand-E

    • Hand-E C10

  • Required kits: Depending on your gripper model, use the corresponding CRX integration kit:

    • Hand-E

      • Single Gripper Kit: HND-CRX-KIT

      • Dual Kit (X bracket): CRX-DUAL-X-HND

      • Dual Kit (Y bracket): CRX-DUAL-HND

    • Hand-E C10

      • Single Gripper Kit: HND-C10-CRX-KIT

      • Dual Kit (X bracket): CRX-DUAL-X-HND-C10

      • Dual Kit (Y bracket): CRX-DUAL-Y-HND-C10

    • 2F-85

      • Single Gripper Kit: AGC-CRX-KIT-85

      • Dual Kit: CRX-DUAL-AGC-085

    • 2F-140

      • Single Gripper Kit: AGC-CRX-KIT-140

      • Dual Kit: CRX-DUAL-AGC-140

  • Installation not completed? Refer to the article Installing a Robotiq Gripper on Fanuc CRX

1. Gripper Activation

To activate the gripper, use the IPL_ROBOTIQ_GRIPPER_ACT Karel program. You can pass the slave_id directly from a TP program or through the SET_VAR instruction.

Required Parameters:

  • slave_id_from_set_var:
    • 0 = from TP program
    • 1 = from SET_VAR using variable rqSlaveId
  • slave_id: 9, 2, 3, or 4

Example with SET_VAR:

SET_VAR(entry, 'IPL_ROBOTIQ_GRIPPER_ACT', 'rq_live_test', slave_id_from_set_var, status)

SET_VAR(entry, 'IPL_ROBOTIQ_GRIPPER_ACT', 'rqSlaveId', slave_id, status)

CALL_PROG('IPL_ROBOTIQ_GRIPPER_ACT', prog_index)

 

2. Open and Close the Gripper

Use the following TP programs:

  • IPL_ROBOTIQ_GRIPPER_OPEN – Moves gripper to position 0 (fully open)
  • IPL_ROBOTIQ_GRIPPER_CLOSE – Moves gripper to position 255 (fully closed)

These TP programs internally call the IPL_ROBOTIQ_GRIPPER_MOVE Karel program with preset position values.

 

3. Move Gripper to a Custom Position

Use the move_gripper routine in a Karel program to send a specific grip command.

Syntax: move_gripper(slave_id, grip_pose, speed, force, wait_motion)


Parameters:

  • slave_id: 9, 2, 3, or 4
  • grip_pose: value between 0 (open) and 255 (close)
  • speed: 0–255
  • force: 0–255
  • wait_motion: 0 (don’t wait) or 1 (wait for completion)

Returns TRUE when motion is completed.

 

4. Monitor Gripper State

The following routines allow you to retrieve gripper state feedback from the FANUC CRX robot:

Get Position

 get_gripper_position(slave_id)

  •  Returns grip value between 0 and 255.

Check Activation

 is_gripper_activated(slave_id)

  •  Returns TRUE or FALSE.

Object Detection

 get_obj_detection_code(slave_id)

  • Returns:
    • 0 = Unknown
    • 1 = Detected on open
    • 2 = Detected on close
    • 3 = No object

Fault Code

 get_gripper_fault(slave_id)

  •  Returns:
    • 0 = No fault
    • 3–15 = Various fault codes (e.g., 5 = NOT_ACT, 8 = OVER_TEMPERATURE)


5. Integration Tips

  • Use routines (move_gripper, get_obj_detection_code, etc.) in your Karel programs for greater control.
  • Only use direct Karel program calls (IPL_ROBOTIQ_GRIPPER_MOVE, IPL_ROBOTIQ_GRIPPER_GRIP_CHECK) when specifically required by your logic.
  • Always validate the Slave ID and check for activation before attempting motion commands.

Conclusion

By using the Robotiq-provided TP and Karel programs, you can fully control and monitor your gripper on a FANUC CRX robot. Whether you're setting a simple open/close sequence or integrating advanced grip checks and fault recovery, these tools give you a flexible control interface.

Useful Links

 

Updated: December 2025