Warning

What does E4 mean?

This warning indicates an error in the periphery, such as an I/O module, which might only have future implications rather than immediate system failure. Specific examples include a short-circuit detected at an I/O module or an exhausted/missing battery. The user is responsible for deciding the necessary reaction, as ignoring it could lead to data loss (e.g., due to battery failure) or damage to peripheral components over time.

• Issue with an external I/O module or sensor.
• Intermittent communication fault on a peripheral bus.
• Degradation of a peripheral component.

Click steps to track your progress.

1. 1

   Inspect the physical connection of the affected I/O module.

2. 2

   Verify the voltage supply to the I/O module at its power terminals.

3. 3

   Check for loose connections on terminal blocks of the I/O module.

4. 4

   Examine the configuration of the I/O module for correct addressing and type.