252
(7) Close XINJEConfig tool, cut the PLC power and power on again to make the settings
effective.
6-2-7．Modbus Communication application
Wiring method
There are two wiring methods:
232 wiring methods
Note:
1. COM2 with *1 only show the RS232 pins.
2. XD/XL series PLC，RS232 do not support full-duplex, so it can only communicate in
single direction.
3. RS232 communication distance is short (about 13m); RS485 is suitable for longer distance.
485 wiring methods
Connect all A terminals, connect all B terminals. A is RS485+, B is RS485-.
Application：One xinje XD3 series PLC controls 3 XC series PLCs, slave PLCs follow the
master’s action. (Master PLC Y0 ON, then slave PLC Y0 ON; Master PLC Y0 OFF, then
slave PLC Y0 OFF) Precondition: on-off of Y0 makes communication have enough time to
react. Also three slave PLCs can be not that synchronous (not fully synchronous).
Method 1 usual program
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