BONFIGLIOLI Vectron Agile, Communications Manual

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Modbus Agile 02/2011 54
Modbus Message Examples
9.2.1.2 Function Code 6, Write 16-Bit Parameter
Example 1:
Writing parameter
Rated Mech. Power
376 (0x0178) in data set 4 to the frequency inverter with ad-
dress 3.
The rated mechanical power is to be set to 1.5 kW. Parameter
Rated Mech. Power
376 has one de-
cimal place.
Thus the value to be sent is 15 = 0x000F.
Request: Master

Frequency Inverter
Field: SoF Addr. Fct.Code DSet/Par-No. Para-Value LRC EoF
ASC : 0 3 0 6 4 1 7 8 0 0 0 F 2 F CR LF
Hex 3A 30 33 30 36 34 31 37 38 30 30 30 46 32 46 0D 0A
Response: Frequency Inverter

Master
Field: SoF Addr. Fct.Code DSet/Par-No. Para-Value LRC EoF
ASC : 0 3 0 6 4 1 7 8 0 0 0 F 2 F CR LF
Hex 3A 30 33 30 36 34 31 37 38 30 30 30 46 32 46 0D 0A
The response is an echo of the request message.
Example 2:
Writing out of range value 0 to parameter
Rated Mech. Power
376 (0x0178) in data set 2 of the fre-
quency inverter with address 3.
Request: Master

Frequency Inverter
Field: SoF Addr. Fct.Code DSet/Par-No. Para-Value LRC EoF
ASC : 0 3 0 6 2 1 7 8 0 0 0 0 5 E CR LF
Hex 3A 30 33 30 36 32 31 37 38 30 30 30 30 35 45 0D 0A
Error Response: Frequency Inverter

Master
Field: SoF Addr.
Fct.Code
Except.
Code
LRC EoF
ASC : 0 3 8 6 0 4 7 3 CR LF
Hex 3A 30 33 38 36 30 34 37 33 0D 0A
The sent exception code is hexadecimal value 0x04 = SLAVE DEVICE FAILURE.