Omron NT31 NT31C manual 126

Connecting to the Host’s RS-422A/485 Port Section 5-2

Connecting between NT31/NT31C Units

NT31/NT31C Host

RS-485

:

NT31/NT31C side NT31/NT31C side

114

1325

RS-232C/

422A/485

connector

Abbreviation Pin number

FG	Connector
	hood

−1

SD	2
RD	3
RS	4
CS	5

−6

SG 7

−8

TRM 9

RDB (+)	10
SDB (+)	11
−	12
−	13
−	14
SDA (−)	15
RDA (−)	16
−
−	−
RSB (+)	23
RSA (−)	24
−	25

Shielding wire

:

Pin number Abbreviation

Connector

hood FG

1−

2SD

3RD

4RS

5CS

6−

7SG

8−

9TRM

10	RDB (+)
11	SDB (+)

12−

13−

14−

15 SDA (−)

16RDA (−)

−

− −

23RSB (+)

24RSA (−)

25−

RS-232C/ 422A/485 connector

114

1325

(25-pin type) (25-pin type)

Next PT

*2

Make the connection between pin numbers 9 and 10 at the NT31/NT31C at the end of the RS-485 cable (marked : in the figure above) only.

Connecting an NT31/NT31C and a Host

In order to avoid an FG ground loop, do not connect the functional ground of the NT31/NT31C to the shielding of the RS-422A cable.

The relay terminal block is not included in this figure. Insert the relay terminal block so as to achieve the wiring configuration shown below.

NT31/NT31C Host

RS-485

Wiring When Connecting a CS1-series CS1G/H Serial Communication Board, C Series C200HX/HG/HE(-Z)E Communication Board, or CQM1H Serial Communications Board

Applicable units:

CS1G-CPU42-E(V1) CS1G-CPU43-E(V1)

CS1G-CPU44-E(V1) CS1G-CPU45-E(V1)

CS1H-CPU63-E(V1) CS1H-CPU64-E(V1)

126