ABB AC500 Introduction Manual page 69

Figure: Maximum configuration (1 FBP Terminal Unit plus 7 I/O Terminal Units)
Disassembly of a Terminal Unit
Figure: I/O Terminal Unit disassembly (TU515, TU516, TU531 or TU532)
A screwdriver is inserted in the indicated place to separate the Terminal Units.
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Introduction to AC500
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AC500 / Issued: 07.2006