Siemens SENTRON ATC6300 - Page 154

MODBUS communication
11.4 MODBUS functions
3KC ATC6300 transfer control device
152 Manual, 03/2018, L1V30535632002A-01
Response of the slave
Slave address
08h
Function
04h
Number of bytes
10h
MSB register 10h
00h
LSB register 10h 00h
-
-
MSB register 17h
08h
LSB register 17h
C1h
LSB CRC
56h
MSB CRC
B1h
The response always consists of the address of the slave, the code of the function that was
queried by the master, and the content of the queried register. The message is concluded by
the CRC Checksum .
Function 06: Preset single register
This function permits writing to the register. It can only be used with registers that have an
address greater than 1000 Hex. It is possible, for example, to modify parameters. If the new
parameter is not within the range of the ATC an error message is output. An error message
is also output in the case of incorrect parameter addresses. The addresses and the valid
parameter range can be found in the chapter Data library (Page 157).
Master message
Slave address
08h
Function
06h
MSB address
2Fh
LSB address
0Fh
MSB data
00h
LSB data
0Ah
LSB CRC
31h
MSB CRC
83h
Response of the slave
The response of the slave is an echo to the query.
The slave sends the address and the new value of the parameter back to the master.
Function 07: Read exception status
Using this function, the status of the ATC6300 can be queried.