ABB AC500 PLC Hardware Manual page 1204

System Assembly, Construction and Connection
AC500-eCo > Mounting and Demounting
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Mount I/O module at the top of the DIN rail, then snap it in below.
Attach I/O module by hand to an other module. The serial I/O bus is connected automati-
cally.
3ADR010121, 13, en_US 2019/04/17