Nidec LEROY-SOMER Powerdrive FX, Руководство по вводу в эксплуатацию

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166
OPERATION WITH MODBUS RTU
Commissioning manual Powerdrive MD2/FX
4617 en - 2017.09 / e
Frame returned by the slave:
Bytes Description
0 Slave address
1 Function code 0x03
2 Number of bytes to be read
3 Word 0 MS byte
4 Word 0 LS byte
5 Word 1 MS byte
6 Word 1 LS byte
... …
n CRC LS byte
n + 1 CRC MS byte
Where n = 3 + number of bytes to be read.
• Function code 6: Write single register
Writes a value to a single 16-bit register. The normal response
is an echo of the request, returned after the register contents
have been written.
Frame sent by the master:
Bytes Description
0 Slave address (0 to 247)
1 Function code 0x06
2 Register address MS byte
3 Register address LS byte
4 Register value MS byte
5 Register value LS byte
6 CRC LS byte
7 CRC MS byte
Frame sent by the slave:
Bytes Description
0 Slave address
1 Function code 0x06
2 Register address MS byte
3 Register address LS byte
4 Register data MS byte
5 Register data LS byte
6 CRC LS byte
7 CRC MS byte
• Function code 16: Write multiple
Writes a contiguous array of registers. The slave imposes an
upper limit on the number of registers which can be written. If
the limit is exceeded, the slave does not respond.
Note: 12 parameters maximum can be written.
Frame sent by the Master:
Bytes Description
0 Slave address (1 to 247)
1 Function code 0x10
2 Start word address MS byte
3 Start word address LS byte
4 Number of words to be written MS byte
5 Number of words to be written LS byte
6 Number of bytes to be written
7 Word 0 to be written MS byte
8 Word 0 to be written LS byte
9 Word 1 to be written MS byte
10 Word 1 to be written LS byte
... …
n CRC LS byte
n + 1 CRC MS byte
Where n = 7 + number of bytes in write block.
Frame returned by the slave:
Bytes Description
0 Slave address (1 to 247)
1 Function code 0x10
2 Start word address MS byte
3 Start word address LS byte
4 Number of words written MS byte
5 Number of words written LS byte
6 CRC LS byte
7 CRC MS byte
CRC
slave n
Command (03)
No. of bytes
Word number 0
Word number 1
…
1 hexadecimal byte
2 hexadecimal bytes
CRC
slave n
Command (06)
Register address
Register value
1 hexadecimal byte
2 hexadecimal bytes
Start word address
Number of words
CRC
No. of bytes
Word number 0
Word number 1
…
slave n
Command (10h)
1 hexadecimal byte
1 hexadecimal byte
2 hexadecimal bytes
2 hexadecimal bytes
slave n
Start word address
Number of words
CRC
1 hexadecimal byte
2 hexadecimal bytes
Command (10h)