Xinje XP-18 Series Operating Manual page 32

Modbus communication
XMP series product support master and slave mode of Modbus communication protocol.
Master format: When PLC is set to be master station, PLC sends request to other slave station
devices via Modbus instructions, other devices respond to the master station.
Slave format: When PLC is set to be slave station, it can only respond to other master devices.
The defaulted status of XMP is Modbus slave mode.
Communication address
The internal soft unit's numbers of XMP are corresponded with Modbus station address numbers,
please see the following table:
Coil space: ( Modbus address prefix is " 0x " )
Bit component address
M0~M7999
X0~X1037(octal)
Y0~Y1037(octal)
S0~S1023
M8000~M8511
T0~T618
C0~C634
Register space: ( Modbus address prefix is " 4x " )
Word component
address
D0~D7999
TD0~TD618
CD0~CD634
D8000~D8511
FD0~FD5000
FD8000~FD8511 26624~27135
Free format communication
Free format communication transfer data in the format of data block, each block can transfer 128
bytes at most. Meanwhile each block can set a start symbol and a end symbol, or not set.
When communicating in free format mode, FD8220 should be 255.
Start Symbol (1 byte)
Modbus address
( decimal K )
0~7999
16384~16927
18432~18975
20480~21503
24576~25087
25600~26218
27648~28282
Modbus address Modbus address
( decimal K )
0~7999 0~1F3F
12288~12906 3000~326A
14336~14970 3800~3A7A
16384~16895 4000~41FF
18432~23432 4800~5B88
6800~69FF
Data Block (max bytes 128 )
Modbus address
( hex H )
0~1F3F
4000~421F
4800~4A1F
5000~53FF
6000~61FF
6400~666A
6C00~6E7A
( hex H )
End Symbol (1 byte)
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