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Shenzhen King Pigeon Hi-Tech Co.,LED
Ver 1.2
PLC Data acquisition protocol conversion gateway
-D225
5.2.3.5
The description of data message format for collecting
Siemens S7-200 SMART
Take the data of Q0.0-Q0.7 as an example, the mapping address of the D225 device: 5000-5007,
the number of collections: 8
Modbus Poll: Data sent TX: 00 F4 00 00 00 06 01 01 13 88 00 08
00 transaction processing identifier high bit
0F transaction processing identifier low
00 High bit of protocol identifier
00 low bit of protocol identifier
00 High byte of the length of the byte following
06 Low byte of the length of the following byte
01 D225 device address
01 Read the function code of the register
13 High bit of start address
88 Low bit of start address
00 The high number of acquisitions
08 The low number of acquisitions
D225 device returns data RX: 00 F4 00 00 00 04 01 01 01 81
00 high bit of transaction identifier
F4 transaction processing identifier low bit
00 High bit of protocol identifier
00 low bit of protocol identifier
00 High byte of the length of the byte following
04 Low byte of the length of the following byte
01 D225 device address
01 Read the function code of the register
01 Number of data bytes behind
81 data (Q0.0-Q0.7 data)
Take the data of VW0-VW9 as an example, the mapping address of D225 device: 22000-22009, the
number of collections: 10
Modbus Poll: Data sent TX: 00 F5 00 00 00 06 01 03 55 F0 00 0A
00 high bit of transaction identifier
F5 transaction processing identifier low bit
00 High bit of protocol identifier
00 low bit of protocol identifier
00 High byte of the length of the byte following
06 Low byte of the length of the following byte
01 D225 device address
03 Read the function code of the register
55 High bit of start address
