Omron NT631 Operation Manuals page 151

Connecting to the Host's RS-422A/485 Port
Connecting an NT631/NT631C and a Host
The relay terminal block is not included in this figure. Insert the relay terminal block
so as to achieve the wiring configuration shown below.
NT631/NT631C
RS-485
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
Abbreviation
TRM
RDA (−)
RDB
RDB (+)
RS-422A/
SDA
485
SDA (−)
terminal
SDB
SDB (+)
block
RSA (−)
RSA
RSB (+)
RSB
Functional
ground
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-485A cable.
Host
Pin number
Shielding wire
Connector
hood
TRM
1
2
3
4
5
6
7
8
9
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
1
PLC side
Abbreviation
FG
SDA (−)
SDB (+)
−
RS-422A
−
connector
−
RDA (−)
−
RDB (+)
−
(9-pin type)
6
9
5
143