Omron SYSMAC CJ1W-EIP21 - Manual (Page 276)

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Receiving Explicit Messages Section 9-2
I/O Memory Read/Write for CPU Units
Note With a EtherNet/IP Unit or built-in EtherNet/IP port with unit version 2.0 or
later, the PLC object class ID is C4 hex. (With unit version 1.0, the PLC object
class ID is F2 hex.)
The commands and responses for the explicit messages that can be sent and
received are described on the following pages.
In the following command and response formats, all boxes represent 1 byte
each.
Service Service
code
Class ID Instance ID Request
service
data
Contents
Byte Data Read 1C Hex C4 Hex
(2F Hex)
(See note.) Specifies
area (01 Hex
to 14 Hex) Address, No.
of read bytes Reads the specified node data in byte units.
The word data is read in order, from high to
low bytes.
Read data: 200 bytes max.
Word Data
Read 1D Hex Address, No.
of read
words Reads the specified node data in word
units. The word data is read in order, from
high to low bytes.
Read data: 200 bytes max.
Byte Data Write 1E Hex Address,
byte data Writes the specified node data in byte units.
The word data is specified in order, from
high to low bytes.
Write data: 200 bytes max.
Word Data Write 1F Hex Address
word data Writes the specified node data in word
units. The word data is specified in order,
from high to low bytes.
Write data: 200 bytes max.