2

Connecting a Bus Stub to a Remote I/O Scanner

A bus stub must always be Belden 9182 or equivalent cable, regardless of the cable type used for the dual bus trunk.

 

 

a44882

BUS

 

 

STUB

 

 

BELDEN

 

 

9182

 

 

OR

 

NO TERMINATING RESISTOR

EQUIVALENT

 

BUS A

ÓÓ

 

 

 

BUS B

TERMINATING RESISTOR NEEDED IF REMOTE

I/O SCANNER IS AT END OF A BUS.

The total length of all stubs on a bus should be 100 feet or less. Within each 20% section of the actual bus length, the total maximum stub length is 20 feet. This can be divided into shorter stubs, provided that the total length in each 20% of the bus is 20 ft. or less.

BusStub Connections

1.Bus stub cable attaches to the upper four terminals on a Remote I/O Scanner.

 

SER1

1

2

SHIELD

 

IN

 

 

 

 

 

SER2

3

4

SHIELD

 

OUT

 

 

 

 

 

SER1A

5

6

SHIELD

R

IN A

 

 

 

 

 

 

 

E

 

 

 

SHIELD

D

SER2A

7

8

U

OUT A

N

 

 

 

 

D

 

 

 

SHIELD

A

SER1B

9

10

IN B

N

 

 

 

C

 

 

 

 

Y

SER2BÑÓ11

12

SHIELD

 

 

OUT B

a44883

CONNECT

BUS

STUB CABLE

HERE

2.Connect Serial 1 to Serial 1 of the next device. Connect Serial 2 to Serial 2 of the next device. Connect Shield Out to Shield In of the next device. Connect additional devices in the same way. If the Remote I/O Scanner is the bus switching device (directly connected to the dual bus), its Shield In terminal can be left unconnected. If it is the last device on the bus stub, the Shield Out terminal can be left unconnected. The bus stub does not require a terminating resistor.

34

Series 90±70 Remote I/O Scanner User's Manual ± July 1992

Page 41
Image 41
GE GFK0579B user manual Connecting a Bus Stub to a Remote I/O Scanner, BusStub Connections

GFK0579B specifications

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