35
Fig. 3-12 Recommended wiring diagram for the communication between PLC and several drives
(the drives and motors are reliably grounded)
If normal communication still cannot be realized through the above wiring, take the following measures to
correct it:
1
） Provide separate power supply to the PLC (or host device) or isolate its power supply. In case the
external interference is severe, to protect the PLC (or host device) from interference, isolate the
communication wire.
2
） If the RS485/RS232 converter is used, provide separate power supply to the converter.
3
） Use magnetic ring on the communication wire.
4
） If the field conditions permit, reduce the drive carrier frequency.
Note
1. In the applications with large interference, the RS485 converter with isolation shall be used.
2. The RS485 cannot withstand the voltage higher than 30V.
Wiring for Multi-functional input/output terminals
The Multi-functional input/output terminals of MV600 include X1~X8. X1~X6 are two-way opto-isolated circuits,
X7 and X8 are single way opto-isolated circuits, as shown in the following figure. PLC is the common terminal
for X1~X8. For X1~X6, the current passing the PLC terminal may be the source current or sink current; for X7
and X8, the current passing the PLC terminal can be the source current only. The typical wiring methods are
as below:
1. Dry contact mode (X1~X8)
1) When using the internal +24V power supply of the drive, the wiring mode is as shown in Fig.3-13.
PLC
MV600
+RS485- PE
MV600
+RS485- PE
MV600
+RS485- PE
SG +RS485-
RS485 cable
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