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G1  Introduction to AC500  1-44  AC500 / Issued: 07.2006 
Disassembly of a Terminal Unit 
 
Figure: CPU Terminal Base (TB5xx) or I/O Terminal Unit disassembly (TUxx) 
A screwdriver is inserted in the indicated place to separate the Terminal Units. 
Step 4: CPU or Electronic Module assembly 
PM581
 
Figure: Mounting of the CPU (PM5xx) on a Terminal Base (TB5xx), in the same way as I/O modules on 
Terminal Units 
The CPU or I/O module will be plugged on the dedicated Terminal Base / Terminal Unit. And will be 
locked in place. The disassembly is done in reverse order.