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or write one slave station; slave station has no program but only response the master station.
(
Wiring
:
connect all 485+, connect all 485-
)
In RS232 network (see below diagram), there can only be one master and one slave at one
time.
There is dotted line in the diagram. It means any PLC can be master station when all PLC in
the network don’t send data. As the PLC do not have unified clock standard, communication
will fail when more than one PLC send data at one time. It is not recommended to use.
Note:
1. For XD/XL series PLC, RS232 and RS485 only support half-duplex.
2. For XC series PLC, if master PLC send one data to slave PLC, and master PLC send data
again before slave PLC receiving the last one completely, slave PLC end data error may
occur; For XD/XL series PLC, we solve this problem by adding waiting time before
communication, which means the slave PLC will receive the next data only after some time
the last data finished.
6-2-2
.
Changing of Modbus instruction
Modbus instruction handling mode has changed in XD/XL series PLC, users can write
Modbus instructions directly in program, the protocol station will queue up Modbus requests,
which is not the same task with communication; It means users can use one triggering
condition to trigger multiple Modbus instructions at the same time. PLC will queue up
Modbus requests according to protocol station, which will lead to communication error in XC
series PLC.
M0
COLR K1 K500 K3 M1 K2
MCLW K1 K500 K3 M1 K2
REGW K1 K500 D1 K2
XC series
(
×
)
Ma
Slave 1
Slave 2
Slave 3
Slave
Master
Содержание XD Series
Страница 1: ...XD XL series PLC User manual Instruction WUXI XINJE ELECTRIC CO LTD Data No PD05 20201022 3 5 ...
Страница 210: ...209 ...
Страница 314: ...313 B Double click the middle part to modify ...