ABB AC500 PLC Hardware Manual page 365

1 I/O bus
2 4.0 - 4.7: Connected with UP (switch) -> Input;
Connected with ZP (load) -> Output
3 Switch-gear cabinet earth
The module provides several diagnosis functions
on page 367.
2019/04/17
CAUTION!
The process supply voltage must be included in the earthing concept (e. g.
earthing of the minus pole).
3ADR010121, 13, en_US
I/O Modules > Digital I/O Modules
Ä Chapter 1.5.1.2.7.7 "Diagnosis"
Device Specifications
365