User`s manual

1-22
Multi-drop Communication (RS-422)
Refer to the PLC manual of each manufacturer for connection.
<E.g.>
The following example describes how one ZM-62E is connected to three PLCs made by MITSUBISHI.
See MITSUBISHI’s manual for further details.
Signal
FG
RDA
RDB
SDA
SDB
SG
Link unit
Signal
FG
RDA
RDB
SDA
SDB
SG
Link unit
SD/RD terminal resistance
(ON)
Signal Pin No.
FG
+SD
-SD
+RD
-RD
SG
1
12
13
24
25
7
ZM-62E (CN1)
* Use twist shielded cable.
Signal
FG
RDA
RDB
SDA
SDB
SG
Link unit
1 1 : n (Multi-drop) Communications