Defective Hot Swap Terminal Unit

What does E4-9764 mean?

The hot swap terminal unit itself has been identified as defective. This hardware fault can prevent proper communication with any I/O modules connected to it, potentially leading to widespread I/O errors and system instability. All modules on this unit will be affected.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Replace the defective hot swap terminal unit with a new, functional unit.