Special Functions
6-3-1. MODBUS Communication function
Coil space:
Coil’s
(Dec.)
X0 Y0 S0 M8000 T0 C0
start ID
M0
Corresponded Modbus ID
(Hex.)
0 4000 4800 5000 6000 6400 6C00
Note: coil’s Modbus ID=Modbus ID which corresponds with coil’s start ID +coil
umber
Register space:
Register’s start ID
(Dec.)
D0 TD0 CD0 D8000 FD0 FD8000
n
Corresponded Modbus ID
(Hex.)
0 3000 3800 4000 4800 6800
Note: register’s Modbus ID=Modbus ID which corresponds with register’s start ID + register
number
Communication
Function
XC series PLC support both Modbus master and Modbus slave
Master format: When PLC is set to be master, PLC sends request to other
slave devices via Modbus instructions, other devices response
the master.
Slave format: when PLC is set to be slave, it can only response with other
master devices.
The defaulted status of XC-PLC is Modbus slave.
Communication
ID
For the soft unit’s number in PLC which corresponds with Modbus address number,
please see the following table:
6
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