What causes KUKA Robot alarm KRC0837?

Channel handle variable not properly initialized before use. Incorrect parameter passed to a function expecting a valid channel handle. Channel handle closed or invalidated prior to the operation. Missing or null pointer reference in channel-related function call. Incompatible data type passed instead of a channel handle object.

How do I fix KUKA Robot alarm KRC0837?

1. Review the KRL code at the line where the alarm occurred and verify all channel handle variables are properly declared and initialized 2. Confirm that channel open operations (file or communication channels) completed successfully before attempting read/write operations 3. Check function signatures and parameter lists to ensure the correct channel handle is being passed with proper data type 4. Validate that the channel handle has not been closed or deallocated before the current operation 5. Enable diagnostic mode and review the complete stack trace to identify which function call triggered error code 2173 6. Recompile the KRL program and verify syntax, then perform a controlled restart of the robot controller

KUKA Robot codes

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KUKA Robot Controller

System · Basic

Alarm KRC0837

KUKA Robot KRC0837 - CHANNEL HANDLE EXPECTED 2173

This alarm indicates that a channel handle was expected but not provided in a KRL program operation. The system encountered an invalid or missing channel handle reference when attempting to perform a channel-dependent operation, typically related to file I/O or inter-process communication.

KUKA RobotSystemBasic

KRC0837

KUKA Robot KRC0837 - CHANNEL HANDLE EXPECTED 2173

CHANNEL HANDLE EXPECTED 2173

Common Causes

Channel handle variable not properly initialized before use
Incorrect parameter passed to a function expecting a valid channel handle
Channel handle closed or invalidated prior to the operation
Missing or null pointer reference in channel-related function call
Incompatible data type passed instead of a channel handle object

Troubleshooting Steps

1Review the KRL code at the line where the alarm occurred and verify all channel handle variables are properly declared and initialized
2Confirm that channel open operations (file or communication channels) completed successfully before attempting read/write operations
3Check function signatures and parameter lists to ensure the correct channel handle is being passed with proper data type
4Validate that the channel handle has not been closed or deallocated before the current operation
5Enable diagnostic mode and review the complete stack trace to identify which function call triggered error code 2173
6Recompile the KRL program and verify syntax, then perform a controlled restart of the robot controller

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