Cables
GFK-0356Q
Chapter 10 Cables
10-11
10
37-PIN
CONNECTOR
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.
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
TRANSMISSION LINE.
PLC 1
WORKMASTER
PLC 2
PLC 3
TO OTHER PLCs
(MAXIMUM OF 8 PLCs ON A MULTIDROP)
UP TO A
MAXIMUM OF
4,000 FEET
(1,200 METERS)
MAKE CONNECTIONS
INSIDE D-CONNECTORS
NOTE
SHIELDED
TWISTED
PAIRS
SD (A)
SD (B)
RD (A')
RD (B')
CTS (A')
CTS (B')
RTS (A)
RTS (B)
RT
PIN
*
10
11
12
13
6
14
15
8
9
7
1
RD (A')
RD (B')
SD (A)
SD (B)
RTS (A)
RTS (B)
CTS (A')
CTS (B')
RT
0V
SHIELD
PIN
10
11
12
13
6
14
15
8
9
7
1
RD (A')
RD (B')
SD (A)
SD (B)
RTS (A)
RTS (B)
CTS (A')
CTS (B')
RT
0V
SHIELD
PIN
WSI
SERIES
90 PLC
10
11
12
13
6
14
15
8
9
7
1
RD (A')
RD (B')
SD (A)
SD (B)
RTS (A)
RTS (B)
CTS (A')
CTS (B')
RT
0V
SHIELD
PIN
SERIES
90 PLC
SERIES
90 PLC
15-PIN
CONNECTOR
15-PIN
CONNECTOR
15-PIN
CONNECTOR
WORKMASTER II
WORKMASTER OR
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.
*
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.
*
*
*
CAUTION
27
26
35
34
31
30
33
32
36
1
37
0V
SHIELD
IMPORTANT !
DO NOT
USE TERMINAL STRIPS
OR OTHER TYPES OF
CONNECTORS ALONG THE
LENGTH OF THE TRANSMISSION
LINE WHEN WIRING A
CONFIGURATION
MULTIDROP SERIAL DATA
Figure 10-4. Series 90 PLC to Programmer 8-Wire Multidrop, Serial Data Configuration