ABB S500 - Page 29

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V2 S500 Hardware 1-29 System Data S500 / Issued: 01.2007
Block diagram of the analog I/O modules, earthing concept
Power
AX522
I/O Terminal Unit TU515/TU516
ZP
supply
DIN
rail
I/O-Bus
UP CH-ERRx
0V
UP
+24V
I+ I–
I/O-Bus
Analog I/O interface
Inputs Outputs
+– +–
I+ I– O+ O–
+– +–
O+ O–
PTC PTC
1M
1M
Figure: Block diagram of the analog I/O modules, earthing concept