Ethernet I/O Modules
1.
Data Field
Data is transmitted in 8-, 16- and 32-bit format. The data for 16-bit registers is transmitted in high-byte
first format. For example: 0x0A0B ==> 0x0A, 0x0B. The data for 32-bit registers is transmitted as two
16-bit registers, and is low-word first. For example: 0x0A0B0C0D ==> 0x0C, 0x0D, 0x0A, 0x0B.
The data field of messages sent between a master and a slave contains additional information about
the action to be taken by the master or any information requested by the slave. If the master does not
require this information, the data field can be empty.
Reference (Address)
Description
0xxxx
Read/Write Discrete Outputs or Coils.
A 0x reference address is used to output device data to a digital output
channel.
1xxxx
Read Discrete Inputs.
The ON/OFF status of a 1x reference address is controlled by the
corresponding digital input channel.
3xxxx
Read Input Registers.
A 3x reference register contains a 16-bit number received from an
external source, e.g. an analog signal.
4xxxx
Read/Write Output or Holding Registers.
A 4x register is used to store 16 bits of numerical data (binary or
decimal), or to send the data from the CPU to an output channel.
For more details regarding Address Mapping (Reference Number), refer to Section 6.3
ICP DAS CO., LTD.
PETL/tET/tPET DIO Series User Manual, Ver. 2.1, Sep. 2014, Page: 79
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