Autonics krn100 series, User Manual

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2 Modbus TCP protocol
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2.1 Read Coil Status(Func01–01H)
Reads the output (OX reference, Coil) ON/OFF status 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 the output status (ON: 1, OFF: 0) of 10EA within coil 000001(0000
H) to 000010(0009 H) on the Slave from Master.

Query(Master)
MBAP Header
Function
(Command)
Starting Address No. of Points(Number of data)
High Low High Low
00 0a 00 00 00 06 01H 01 H 00 H 00 H 00 H 0A H
The below example is when coil 000008(0007 H) to 000001(0000 H) value on the Slave is “ON-
ON-OFF-OFF-ON-ON-OFF-ON” and 000010(0009 H) to 000009(0008 H) value is “OFF-ON”.

Response(Slave)
MBAP Header
Function
(Command) Byte Count
(Number of data byte)
Data
(000008 to 000001)
Data
(000010 to 000009)
00 0a 00 00 00 05 01H 01 H 02 H CD H 01 H