Modbus Agile
02/2011
50
Modbus Message Examples
9.1.2.3
Function Code 100, Read 32-Bit Parameter
Example 1:
Reading parameter
Fixed Frequency 2
481 in data set 0 from the frequency inverter with address 1.
Request: Master
Frequency Inverter
Field:
Addr.
Funk.
DSatz/Par-Nr.
CRC
Hex
01
64
01
E1
81
DF
Response: Frequency Inverter
Master
Field:
Addr.
Func.
Par-Value
CRC
Hex
01
64
00
00
03
E8
70
BC
The hexadecimal value sent is 0x000003E8 = 1000. Parameter
Fixed Frequency 2
481 has two de-
cimal places.
Therefore, fixed frequency 2 = 10.00 Hz.
Example 2:
Reading unknown parameter 1600 (0x0640) in data set 2 from the frequency inverter with address 1.
Request: Master
Frequency Inverter
Field:
Addr.
Func.
DSet/Par-No.
CRC
Hex
01
64
26
40
5B
97
Error Response: Frequency Inverter
Master
Field:
Addr.
Func. Except.
CRC
Hex
01
E4
04
6A
C3
Reading unknown parameter 1600 (0x0640) in data set 2 from the frequency inverter with address 1.
Содержание Agile
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