Autonics krn100 series, Руководство пользователя

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2 Modbus TCP protocol
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2.4 Read Input Registers(Func04–04H)
Reads the binary data of Input Registers(3X reference) in the Slave device.
(1)
Query(Master)
MBAP Header
Function
(Command) Starting Address No. of Points(Number of data)
High Low High Low
7Byte 1Byte 1Byte 1Byte 1Byte 1Byte
(2)
Response(Slave)
MBAP Header
Function
(Command)
Byte Count
(Number of
data byte)
Data Data Data
7Byte 1Byte 1Byte 1Byte 1Byte 1Byte
The below example is to read 2EA value within Input Register 300001(0000 H) to 300002(0001
H) on the Slave from the Master.

Query(Master)
MBAP Header
Function
(Command)
Starting Address No. of Points(Number of data)
High Low High Low
00 0b 00 00 00 06 01H 04 H 00 H 00 H 00 H 02 H
The below example is when 30001(0000 H) value on the Slave is “10(A H)” and 300002(0001 H)
is “20(14 H)”.

Response(Slave)
MBAP Header
Function
(Command)
Byte Count
(Number of data
byte) Data Data
High Low High Low
00 0b 00 00 00 07 01H 04 H 04 H 00 H 0A H 00 H 14 H