Instruction manual

3
2. 1 : n Connection (Multi-drop) 3-9
Serial Communications
2. 1 : n Connection
(Multi-drop)
1 : n Connection
One ZM-300 series is connected to multiple PLCs. (Maximum connectable PLCs: 32)
Wiring (RS-422/485)
For connecting information, refer to the instruction manual for the PLC.
Example:
The following example shows how one ZM-300 series is connected to three PLCs
made by MITSUBISHI. For more information, refer to the MITSUBISHI’s instruction
manual for the PLC.
PLC1 PLC2 PLC3 PLCn (n=1 ~ 32)
CN1
F1
F2
F3
F4
F5
F6
F7
SYSTEM
POWER
Maximum length (ZM-300 series to the terminating PLC) = 500 m
RS-422/RS-485 connection
ZM-300 series
(n = 1 to 32)
FG
RDA
RDB
SDA
SDB
SG
FG
RDA
RDB
SDA
SDB
SG
FG
+SD
-SD
+RD
-RD
SG
1
12
13
24
25
7
FG
RDA
RDB
SDA
SDB
SG
* Use shielded twist-pair cables.
Signal
Pin No.
ZM-300 (CN1)
RD terminating
resistance
(ON)
Link module Link module Link module
Signal Signal
Terminating
resistance
(OFF)
Terminating
resistance
(OFF)
Terminating
resistance
(ON)
Signal