Siemens sinamics dcp - Page 288

Operation
7.7 Communication via Modbus TCP
SINAMICS DCP
286 Operating Instructions, 09/2019, A5E34382853K
Table 7- 46 Start parameter request: Writing the parameter value of p55450 from device number 17 (DCP_CTRL)
Value
Byte
Description
MBAP header
03 h
0258 h
0007 h
0010 h
7
8,9
10,11
12,13
Function code (read)
Register start address
Number of registers to be written to (40601 … 40610)
Number of registers
Table 7- 47 Response for successful write operation
Value
Byte
Description
MBAP header
03 h
20 h
7
8
Function code (read)
Number of following data bytes (20 h: 32 bytes ≙ 16 registers)
0002 h
2F04 h
8002 h
0101 h
9,10
11,12
13,14
15,16
40601: DS47 Control = 2 (request was executed)
40602: Function code 2F h (47), response length 4 bytes
40603: Request reference mirrored = 80 h,
response identifier = 2 (change parameter)
40604: DO-ID = 1, number of parameters = 1
Table 7- 48 Response for unsuccessful write operation - write request still not completed
Value
Byte
Description
MBAP header
03 h
20 h
7
8
Function code (read)
Number of following data bytes (20 h: 32 bytes ≙ 16 registers)
0001 h
2F00 h
0004 h
9,10
11,12
13,14
40601: DS47 Control = 1 (request is processed)
40602: Function code 2F h( 47), response length 0 (error)
40603: Error code: 0004 Response Not Ready (response has still not been
issued)