Pulse Output 2 Stop Error Code

What does A438 mean?

This word stores a specific error code if a fatal pulse output error occurs for pulse output 2. It also stores a code if pulse output 2 is stopped due to a limit input (CW or CCW) when the limit input function is set to be always enabled in the PLC Setup. The value stored in A438 provides specific information about the cause of the pulse output stop, requiring further interpretation.

• A fatal pulse output error occurred during an origin search operation for pulse output 2.
• Pulse output 2 stopped due to receiving an active CW or CCW limit input signal (A542.08 or A542.09) while the limit input function is enabled in the PLC Setup.
• An internal malfunction within the pulse output module for pulse output 2 led to a stop.
• Incorrect configuration of origin search parameters or limit switch logic for pulse output 2.

Click steps to track your progress.

1. 1

   Read the specific error code value from auxiliary word A438 to diagnose the exact cause of the fatal error.

2. 2

   If the error occurred during an origin search, verify the wiring and functionality of the origin sensor for pulse output 2.

3. 3

   If stopped by a limit input, check the physical status and wiring of the Pulse Output 2 CW Limit Input Signal A542.08 and Pulse Output 2 CCW Limit Input Signal Flag A542.09.

4. 4

   Verify the PLC Setup configuration for pulse output 2, specifically the setting for the limit input function (e.g., enabled/disabled as required).

5. 5

   To clear the error code, initiate a new origin search for pulse output 2.

6. 6

   Ensure that neither the Pulse Output 2 CW Limit Input Signal A542.08 nor the Pulse Output 2 CCW Limit Input Signal Flag A542.09 is active when attempting to clear the error.