Siemens SIMATIC S7 System Manual page 207

STATUS value
(W#16#....)
8380
8381
8382
8383
8384
8385
S7-1200 Programmable controller
System Manual, 11/2009, A5E02486680-02
Description
Response code
sent to Modbus
master (B#16#..)
No response CRC error
01 Function code not supported
No response Data length error
02 Data address error
03 Data value error
03 Data diagnostic code value not supported (function code 08)
Programming instructions
6.3 Global library instructions
207