Siemens SENTRON ATC6300 - Page 157

MODBUS communication
11.4 MODBUS functions
3KC ATC6300 transfer control device
Manual, 03/2018, L1V30535632002A-01
155
Error messages
If the slave contains an incorrect message, it responds with a message consisting of the
queried function with 80Hex, followed by an error code byte.
The error codes that are sent to the master are listed below:
Code
Error
01
Illegal function
02
Invalid address
03
Parameter outside the setting range
04 Version of function not possible
06
Slave is overloaded, the function is not currently available
CRC calculation
Information on the CRC calculation can be found under www.modbus.org in the MODBUS
over Serial Line Specification and Implementation Guide
(http://www.modbus.org/docs/Modbus_over_serial_line_V1_02.pdf
).
LRC calculation
Information on the LRC calculation can be found under www.modbus.org in the MODBUS
over Serial Line Specification and Implementation Guide
(http://www.modbus.org/docs/Modbus_over_serial_line_V1_02.pdf
).