ABB AC500 V3 Hardware Manual page 986

System assembly, construction and connection
AC500 (Standard) > Mounting and demounting
3.
2.6.3.4 Mounting/Demounting the I/O modules
After mounting the terminal unit, mount the I/O modules.
1.
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The demounting is carried out in a reversed order. Press above and below, then remove
the processor module.
Press the I/O module into the terminal unit until it locks in place.
3ADR010278, 3, en_US 2022/01/31