Perle Systems IOLAN SCS - Manual (Page 373)

I/O Wiring Diagrams 373
Wiring I/O Diagrams
RTD 4-Wire
In a 4-wire RTD configuration, connect the return wire to A1+, the excite wire to A1-, the sense wire
to A1s, and leave the fourth wire disconnected.
Relay Output
Normally Open Contact
To connect Relay channel R1 for a circuit that is normally inactive, connect one wire to the COM
(common) connector and one wire to the NO (normally open) connector.
Normally Closed Contact
To connect relay channel R1 for a circuit that is normally active, connect one wire to the COM
(common) connector and one wire to the NC (normally closed) connector.
A1+ A1- A1s A2s A2+ A2- A3
+
A3
-
A3
s
A4
s
A4
+
A4
-
re
turn
exc
ite
sens
e
COM NC NO NO COM NC
R1 R2
COM NC NO NO COM NC
R2 R1