11. Modbus TCP server
11. 7. “Write Multiple Registers” (16 = 16#10) function
This Modbus request is used to write a number (No. of Registers) of adjacent words starting at a given address (Starting Address). The values to be written are supplied one after another (First Register Data V Last Register Data).
Request format: |
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Byte | Meaning |
0 | Function Code = 16#10 |
1 | Starting Address Hi |
2 | Starting Address Lo |
3 | No. of Registers Hi (0) |
4 | No. of Registers Lo (1 - 100) |
5 | Byte Count (B = 2 × No. of Registers) |
6 | First Register Data (Hi) |
7 | First Register Data (Lo) |
… | …………… |
B+4 | Last Register Data (Hi) |
B+5 | Last Register Data (Lo) |
Response format: |
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Byte | Meaning |
0Function Code = 16#10
1Starting Address Hi
2Starting Address Lo
3No. of Registers Hi (0)
4No. of Registers Lo (1 - 100)
Exception response format: |
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Byte | Meaning | With the VW3A3310d Ethernet card | ||
0 | Function Code = 16#90 |
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| 01 | (Illegal Function) | |
1 | Exception Code | 02 | (Illegal Data Address) | |
03 | (Illegal Data Value) | |||
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| 04 | (Illegal Response Length) | |
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37
