Siemens SINAMICS S120 Series Function Manual page 181

Table 6- 17 Response for unsuccessful write operation - write request still not completed
Value Byte Description
MBAP header
Number of following data bytes (20 h: 32 bytes ≙ 16 registers)
03 h 7 Function code (read)
20 h 8
0001 h 9,10 40601: DS47 Control = 1 (request is processed)
2F00 h 11,12 40602: Function 2F h(47), response length 0 (fault)
0004 h 13,14 40603: Error code:
issued)
Communication
Function Manual, 12/2018, 6SL3097-5BD00-0BP0
0004 Response Not Ready (response has still not been
Communication via Modbus TCP
6.6 Communication via data set 47
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