I/O Module Stuck-at Error

What does E3-25 mean?

A 'stuck-at' error has been detected on an I/O bus module, indicating that a signal line or a logic gate within the module is permanently fixed at a high or low state. This prevents proper signal transmission or processing, leading to incorrect I/O values and unreliable control.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   If the error persists after checking wiring and restarting, replace the I/O module, as it likely indicates an internal hardware fault.