Modbus Agile
02/2011
48
Modbus Message Examples
9.1.2
32 Bit Zugriff
9.1.2.1
Function Code 3, Read 32-Bit Parameter
Example 1:
Reading parameter
Fixed Frequency 2
481 (0x01E1) in data set 1 from the frequency inverter with
address 1.
Request: Master
Frequency Inverter
Field:
Addr.
Func.
DSet/Par-No.
No. of Regs
CRC
Hex
01
03
11
E1
00
02
91
01
Response: Frequency Inverter
Master
Field:
Addr.
Func.
No.Bytes
Par-Value
CRC
Hex
01
03
04
00
00
03
E8
FA
8D
The hexadecimal value sent is 0x03E8 = 1000. Parameter
Fixed Frequency
481 has two decimal
places.
Therefore, the frequency is 10.00 Hz.
Example 2:
Reading parameter
Fixed Frequency 2
481 (0x01E1) in data set 0 from the frequency inverter with
address 1 and No. of Regs field set to 1 (invalid value).
Request: Master
Frequency Inverter
Field:
Addr.
Func.
DSet/Par-No.
No. of Regs
CRC
Hex
01
03
01
E1
00
01
D5
C0
Error Response: Frequency Inverter
Master
Field:
Addr.
Func.
Except.
CRC
Hex
01
83
04
40
F3
The exception code sent is hexadecimal value 0x04 = SLAVE DEVICE FAILURE.
Содержание Agile
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Страница 44: ...Modbus Agile 02 2011 44 Handling of Data Sets Cyclic Writing ...
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