Omron Programmable Terminals NT631 Setup Manual page 134

Connecting to the Host's RS-422A/485 Port
NT631/NT631C side
RDA
Abbreviation
TRM
RDA (-)
RDB
TRM
RDB (+)
SDA
RS-422A/
SDA (-)
485
terminal
SDB SDB (+)
block
RSA (-)
RSA
RSB (+)
Functional
RSB
ground
24V
+DC
For details on handling shield wires, refer to 5-2-8 Handling the Shield on RS-
422A/485 Cables on page 125.
Wiring When Connecting a CVM1/CV-series CPU Unit
Applicable Units:
CV500-CPU01-EV1
CV2000-CPU01-EV1
CVM1-CPU01-EV@
CVM1-CPU21-EV@
CVM1/CV-series CPU Units whose model names do not have the suffix -EV@
cannot be connected by any connection method.
NT631/NT631C side
RDA
Abbreviation
TRM
RDA (-)
RDB
TRM
RDB (+)
SDA
RS-422A/
SDA (-)
485
terminal
SDB
SDB (+)
block
RSA (-)
RSA
RSB (+)
Functional
RSB
ground
24V
+DC
For details on handling shield wires, refer to 5-2-8 Handling the Shield on RS-
422A/485 Cables on page 125.
Wiring for a Memory Link Connection
Prepare the adapter cable while referring to the following diagram.
RDA
TRM
RDB
SDA
SDB
RSA
RSB
24V
+DC
For details on handling shield wires, refer to 5-2-8 Handling the Shield on RS-
422A/485 Cables on page 125.
PLC side
Pin number Abbreviation
Short-circuit tool
Shielding wire Connector
FG
hood
1
SDA (-)
2
SDB (+)
−
3
−
4
−
5
6 RDA (-)
−
7
8 RDB (+)
−
9
(9-pin type)
CV1000-CPU01-EV1
CVM1-CPU11-EV@
PLC side
Short-circuit tool Abbreviation
Pin number
Shielding wire
Connector
FG
hood
1
SDA (-)
2
SDB (+)
−
3
4 PS
CS
5
6
RDA (-)
−
7
RDB (+)
8
−
9
(9-pin type)
NT631/NT631C side
Abbreviation Short-circuit tool
Shielding wire
RDA (-)
TRM
RS-422A/
RDB (+)
485
SDA (-)
interface
SDB (+)
RSA (-)
RSB (+)
Functional
ground
Section 5-2
6
1
RS-422A
terminal
block
9
5
1
RS-422A
terminal
block
5
Host side
Abbreviation
Connector
hood
SDA (-)
RS-422A
SDB (+)
connector
RS
CS
RDA (-)
RDB (+)
117
6
9