Omron NT631 Operation Manuals page 148

Connecting to the Host's RS-422A/485 Port
Connecting an NT631/NT631C and a Host
140
NT631/NT631C
RS-422A
S Wiring when connecting a CS1-series CS1G/H serial communication board and
C series C200HX/HG/HE (–ZE) communication board
Applicable units:
CS1G-CPU42-E
CS1G-CPU44-E
CS1H-CPU63-E
CS1H-CPU65-E
C200HE-CPU32-(Z)E
C200HG-CPU33-(Z)E
C200HG-CPU53-(Z)E
C200HX-CPU34-(Z)E
C200HX-CPU54-(Z)E
C200HX-CPU65-ZE
NT631/NT631C side
RDA
TRM
RDB
RS-422A/
SDA
485
interface
SDB
RSA
RSB
24V
+DC
In order to avoid an FG ground loop, do not connect the functional ground of the
NT631/NT631C to the shielding of the RS-422A cable.
Host
Abbreviation
Pin number
Shielding wire
Connector
RDA (−)
hood
TRM
RDB (+)
SDA (−)
SDB (+)
RSA (−)
RSB (+)
Functional
ground
Next PT
Section 5-2
CS1G-CPU43-E
CS1G-CPU45-E
CS1H-CPU64-E
CS1H-CPU66-E
CS1H-CPU67-E
C200HE-CPU42-(Z)E
C200HG-CPU43-(Z)E
C200HG-CPU63-(Z)E
C200HX-CPU44-(Z)E
C200HX-CPU64-(Z)E
C200HX-CPU85-ZE
PLC side
1
Abbreviation
FG
1 SDA (−)
2 SDB (+)
−
3
RS-422A
−
4
interface
−
5
6 RDA (−)
−
7
8 RDB (+)
−
9
(9-pin type) 5
6
9