ABB AC500 Installation Instructions Manual page 29

Connection
① I/O-Bus
② Allocation terminal No. - signal name
③ 8 yellow LEDs signal status O0 - O7
④ UP: 1 green LED process voltage
⑤ UP3, UP4: 2 green LEDs (isolated) process voltage
⑥ 2 red LEDs to display errors
⑦ TA525: Label
⑧ TU542(-XC): I/O Terminal Unit
All I/O channels (digital and analog) are protected against reverse polarity, reverse supply and contin-
uous overvoltage up to 30 V DC.
25.07.2017 AC500 Product Family Installation Instructions
DO526(-XC)
29