ABB RET670 Installation And Commissioning Manual page 60

Section 5
Installing the IED
54
IEC08000482 BG V1 EN
Figure 26: Static output module (SOM)
IEC08000483 BG V1 EN
Figure 27: Binary in/out module (IOM). Input contacts named XA corresponds
to rear position X31, X41, and so on, and output contacts named
XB to rear position X32, X42, and so on.
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Installation and commissioning manual