GE 90-30 PLC Series Installation And Hardware Manual page 419

MultiDrop Cable Wiring Diagram
NOTE
WHEN WIRING RS-422 /485 MULTIDROP CABLES, REFLECTIONS ON THE
TRANSMISSION LINE CAN BE REDUCED BY CONFIGURING THE CABLE IN A
DAISY CHAIN FASHION, AS SHOWN BELOW.
MINI-
PROGRAMMER
CONVERTER
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 TERMINAL STRIPS TO OTHER TYPES OF
CONNECTORS ALONG THE LENGTH OF THE TRANSMISSION LINE.
*
TERMINATION RESISTANCE FOR THE RECEIVE DATA (RD) SIGNAL NEEDS TO BE CONNECTED 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 COMMON GROUND POTENTIALS OR GROUND ISOLATION FOR PROPER
OPERATION OF THIS SYSTEM.
Figure I-2. Multidrop Cable Wiring Diagram
GFK-0356Q Appendix I SNP Multidrop
DCD ( A )
DCD ( B )
RD ( A' )
RD ( B' )
SD ( A )
SD ( B )
To Miniconverter on
CTS ( A' )
Programmer Serial
CTS ( B' )
Cable
RTS ( A )
RTS ( B )
15- PIN
FEMALE
FIRST SLAVE LAST SLAVE
STATION (PLC) STATION (PLC)
PLC 15-PIN CONNECTOR
SERIES 90-30 LOCATED
ON POWER SUPPLY
SERIES 90-70 LOCATED
ON THE CPU BOARD
RS-422
MAKE CONNECTIONS
INSIDE D-CONNECTORS
PIN
2
3
10
11
12
13
RT 9
15
8
6
14
+5V 5
0V 7
SHLD 1
TO OTHER PLC's
If applicable
PIN
2 SD ( A )
3 SD ( B )
12 RD ( A' )
13 RD ( B' )
10 RD
11 RTS ( A )
9 RTS ( B )
* 6 CTS ( A' )
To First Slave PLC
14 CTS ( B' )
15 +5V
8 0V
5 SHLD
7
1
15- PIN
MALE
PIN
2 SD ( A )
3 SD ( B )
12 RD ( A' )
13 RD ( B' )
10 RD
11 RTS ( A )
9 RTS ( B )
* 6 CTS ( A' )
To Second Slave PLC
14 CTS ( B' )
15 +5V
8 0V
5 SHLD
7
1
15- PIN
MALE
I
I-3