I/O Module Test Pulse Error

What does E3-12 mean?

A test pulse error has been detected on an I/O bus module channel. This indicates a problem during the module's self-diagnosis, where the generated test pulse or its response was unexpected, potentially due to wiring faults or sensor malfunctions. It can compromise the reliability of the I/O channel.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Perform a system restart or power cycle of the I/O module to clear transient issues.

2. 4

   If the error persists, consider replacing the I/O module.