2. Fasten the processor module with two screws (max. diameter: 4 mm) to the metal plate.
See Hardware description of PM55x-xP and PM56x-xP 
Ä
 Chapter 1.2.1.1
“PM55x-xP and PM56x-xP” on page 21 for electrical connection.
1. Remove IO modules if connected.
Demounting a
Processor
Module
Mounted on a
Metal Plate
 
System Assembly, Construction and Connection
AC500-eCo > Mounting and Demounting
2019/04/173ADR010121, 13, en_US1202