32-Bit Access; Function Code 3, Read 32-Bit Parameter - BONFIGLIOLI Active cube Operation Manual

9.2

32-bit access

9.2.1

Function code 3, read 32-bit parameter

Example 1:
Reading of parameter
Fixed Frequency 2
dress 1.
Request: Master  frequency inverter
Field:
Transaction ID
nn nn
Response: Frequency inverter  Master
Field:
Transaction ID
Hex nn nn
The sent hexadecimal value is 0x03E8 = Decimal 1000. Parameter
decimal places. Thus, the frequency is 10.00 Hz.
Example 2:
Reading of parameters
Fixed Frequency 2
dress set to 1 and number of registers set to 1 (non-permissible value).
Request: Master  frequency inverter
Field:
Transaction ID
nn nn
Error response: Frequency inverter  Master
Field:
Transaction ID
Hex nn nn
The sent exception condition code is the hexadecimal value 0x04 = ERROR SLAVE DEVICE.
10/13
481 (0x01E1) in dataset 1 of frequency inverter with ad-
MBAP
Protocol ID Length
nn nn 00 06
MBAP
Protocol ID Length
nn nn 00 07
481 (0x01E1) in dataset 0 of frequency inverter with ad-
MBAP
Protocol ID Length
nn nn 00 06
MBAP
Protocol ID Length
nn nn 00 03
ACU
Modbus/TCP
Unit Func. DSet/
ID ParNo.
01 03 11 E1
Addi. Func. No. Par.value
Bytes
01 03 04
Fixed Frequency 2
Unit Func. DSet/
ID Par.No.
01 03 01 E0
Unit Func. Excep.
ID
01 83 04
No. regis-
ters
00 02
00 00 03 E8
481 has two
No. regis-
ters
00 01
47