GE 90-30 PLC Series Installation And Hardware Manual page 250

IMPORTANT !
USE TERMINAL STRIPS
OR OTHER TYPES OF
CONNECTORS ALONG THE
LENGTH OF THE TRANSMISSION
LINE WHEN WIRING A
MULTIDROP SERIAL DATA
CONFIGURATION
Figure 10-4. Series 90 PLC to Programmer 8-Wire Multidrop, Serial Data Configuration
GFK-0356Q Chapter 10 Cables
WORKMASTER OR
WORKMASTER II
WHEN WIRING RS-422/485 MULTIDROP
CABLES, REFLECTIONS ON THE TRANS-
MISSION LINE CAN BE REDUCED BY CON
FIGURING THE CABLE IN A DAISY CHAIN
FASHION AS SHOWN BELOW.
WORKMASTER
PLC 3
ALSO IT IS RECOMMENDED TO MAKE ANY
NECESSARY CONNECTIONS INSIDE THE
CABLE CONNECTOR TO BE MOUNTED ON
THE PLC.
IT IS NOT RECOMMENDED TO USE TERMI
NAL STRIPS OR OTHER TYPES OF CON
NECTORS ALONG THE LENGTH OF THE
DO NOT
TRANSMISSION LINE.
TERMINATION RESISTANCE FOR THE RECEIVE DATA (RD) SIGNAL NEEDS TO BE CON
NECTED ONLY ON UNITS AT THE END OF THE LINES. THIS TERMINATION IS MADE ON
THE SERIES 90 PLC PRODUCTS BY CONNECTING A JUMPER BETWEEN PIN 9 AND PIN 10
INSIDE THE 15-PIN D-SHELL, WITH THE FOLLOWING EXCEPTION. FOR SERIES 90-70 PLCs,
CATALOG NUMBERS IC697CPU731 AND IC697CPU771, THE TERMINATION FOR
RD AT THE PLC IS IMPLEMENTED BY A JUMPER BETWEEN PIN 9 AND PIN 11.
*
GROUND POTENTIAL: MULTIPLE UNITS, NOT CONNECTED TO THE SAME POWER
SOURCE, MUST HAVE GROUND POTENTIAL WITHIN " 7V FOR PROPER OPERATION
OF THIS SYSTEM. FAILURE TO PROVIDE A COMMON GROUND MAY CAUSE DAMAGE
TO PLC COMPONENTS.
MAKE CONNECTIONS
INSIDE D-CONNECTORS
SHIELDED
TWISTED
WSI
PAIRS
PIN
SD (A) 27
SD (B)
26
RD (A')
35
RD (B')
34
CTS (A')
31
CTS (B')
RTS (A) 30
RTS (B)
33
RT
32
36
*
0V
1
SHIELD
37
37-PIN
CONNECTOR
UP TO A
MAXIMUM OF
4,000 FEET
(1,200 METERS)
NOTE
PLC 1
PLC 2
TO OTHER PLCs
(MAXIMUM OF 8 PLCs ON A MULTIDROP)
CAUTION
10
Cables
SERIES
90 PLC
PIN
10
RD (A')
11
RD (B')
12
SD (A)
13 SD (B)
6
RTS (A)
14
RTS (B)
15
CTS (A')
8
CTS (B')
9
RT
7
0V
* 1
SHIELD
15-PIN
CONNECTOR
SERIES
90 PLC
PIN
10
RD (A')
11
RD (B')
12 SD (A)
13
SD (B)
6
RTS (A)
14
RTS (B)
15
CTS (A')
8
CTS (B')
9
RT
7
0V
* 1
SHIELD
15-PIN
CONNECTOR
SERIES
90 PLC
PIN
10
RD (A')
11
RD (B')
12 SD (A)
13
SD (B)
6
RTS (A)
14
RTS (B)
15
CTS (A')
8
CTS (B')
9
RT
7
0V
1
* SHIELD
15-PIN
CONNECTOR
10-11