BONFIGLIOLI Vectron ACTIVE - ASCII Modbus Message Examples

Modbus Instruction manual 4305/08
05/08
Modbus Instruction manual 43
8.2 Modbus ASCII-Message Examples
8.2.1 Function Code 3, Read 16-bit Parameter
Example 1:
Reading of parameter Rated Speed 372 (0x0174) in data set 2 from the frequency
inverter with address 1
Request: Master Î Frequency Inverter
Field SoF Adr Fct.Code DSet/Par-No. No. of Regs LRC EoF
ASC
: 0 1 0 3 2 1 7 4 0 0 0 1 6 6 CR LF
Hex
3A 30 31 30 33 32 31 37 34 30 30 30 31 36 36 0D 0A
Response: Frequency Inverter Î Master
Field: SoF Adr Fct.Code no.Bytes Par-Value LRC EoF
ASC
: 0 1 0 3 0 2 0 5 6 E 8 7 CR LF
Hex
3A 30 31 30 33 30 32 30 35 36 45 38 37 0D 0A
The hexadecimal value sent is 0x056E = 1390.
Parameter Rated Speed 372 has no decimal places.
Therefore, the rated speed is 1390 min
-1
.
Example 2:
Reading parameter Rated Speed 372 (0x0174) in data set 0 from the frequency in-
verter with address 1 and No. of Regs field set to 2 (invalid value)
Field: SoF Adr Fct.Code DSet/Par-No. No. of Regs LRC EoF
ASC
: 0 1 0 3 0 1 7 4 0 0 0 2 8 5 CR LF
Hex
3A 30 31 30 33 30 31 37 34 30 30 30 32 38 35 0D 0A
Error Response: Frequency Inverter Î Master
Field: SoF Adr Fct.Code
Excep.
Code
LRC EoF
ASC
: 0 1 8 3 0 2 7 A CR LF
Hex
3A 30 31 38 33 30 32 37 41 0D 0A
The sent exception code is hexadecimal value 0x02 = ILLEGAL DATA ADDRESS.