Connecting to the Host’s RS-422A/485 Port

Section 5-2

5-2-3 Direct Connection between RS-485 Ports at Both Units

The connection method in which the RS-485 ports of an NT631/NT631C and a host are connected is described here.

NT631/NT631C

CPU Unit

CS/CJ-series PLC,

C200HX/HG/HE(-Z)E

Serial port B

9-pin connector

(RS-422A/485, terminal block)

 

RS-485 cable with connectors (max. length: 500 m)

Reference: When RS-485 is used at the PT side, only the NT Link (1:N) method (standard or high-speed) can be used.

Connecting an NT631/NT631C and Host

NT631/NT631C

Host

RS-485

Wiring When Connecting a CS-series Serial Communications Board, CS/

CJ-series Serial Communications Unit, C-series C200HX/HG/HE(-Z)E

Communications Board, or CQM1H Serial Communications Board

Applicable Units:

CS1W-SCU31-V1

CJ1W-SCU31-V1/CJ1W-SCU41(-V1)

CS1G-CPU42/43/44/45-E(V1)

CS1H-CPU63/64/65/66/67-E(V1)

CS1G-CPU42H/43H/44H/45H

CS1H-CPU63H/64H/65H/66H/67H

CS1D-CPU66H/67H (See note.)

C200HE-CPU32/42-(Z)E

C200HG-CPU33/43/53/63-(Z)E

C200HX-CPU34/44/54/64-(Z)E

C200HX-CPU65-ZE/85-ZE

CQM1H-CPU51/61

Note A Serial Communications Board cannot be installed.

RDA

NT631/NT631C side

 

 

TRM

 

 

Abbreviation

Short-circuit tool

 

 

 

 

Shielding wire

 

 

RDA (-)

 

RDB

 

 

 

 

 

 

 

 

TRM

 

 

 

SDA

 

 

RDB (+)

 

 

 

 

RS-422A/

 

 

 

 

 

SDA (-)

 

 

 

 

 

485

 

 

 

 

 

 

 

 

 

SDB

 

interface

SDB (+)

 

 

 

 

 

 

 

 

 

RSA

 

 

RSA (-)

 

 

 

 

 

 

 

 

 

 

 

RSB (+)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RSB

 

 

Functional

 

 

 

 

 

ground

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24V

+DC

 

PLC side

 

1

6

 

 

 

 

Pin number

Abbreviation

 

 

 

Connector

FG

 

 

 

hood

 

 

 

 

 

 

 

1

SDA (-)

 

 

 

2

SDB (+) RS-422A

 

 

3

interface

 

 

 

 

 

4

PS

 

 

 

5

CS

 

 

 

6

RDA (-)

 

 

 

7

 

 

 

 

 

 

 

8

RDB (+)

 

 

 

9

 

 

 

(9-pin type)

5

9

 

 

 

For details on handling shield wires, refer to 5-2-8 Handling the Shield on RS- 422A/485 Cables on page 125.

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Image 135
Omron manual Direct Connection between RS-485 Ports at Both Units, Connecting an NT631/NT631C and Host