Siemens SENTRON ATC6500 - Function 06: Preset Single Register; Function 07: Read Exception Status

MODBUS communication
10.3 MODBUS functions
3KC ATC6500 transfer control device
188 Manual, 05/2019, L1V30538268002A-01
10.3.2 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 192).
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.
10.3.3 Function 07: Read exception status
Using this function, the status of the ATC6500 can be queried.
Master message
Slave address
08h
Function
07h
LSB CRC
47h
MSB CRC
B2h
The following table shows the meaning of the response of the ATC6500.
BIT
Meaning
0
OFF / RESET operating mode
1
Manual operating mode
2
Auto operating mode
3
Test operating mode
4
ATC in fault mode
5
AC supply OK
6
DC supply OK
7
Global alarm enabled