List Of Plc Object Services - Omron CJ1W-DRM21 Operation Manual

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List of PLC Object Services

PLC Objects provide the following services.
Status Read/Write for CPU Units
Services Service
code
CPU Unit Informa- 0E Hex
tion Read
CPU Unit Write 10 Hex
CPU Unit Status 40 Hex
Read
I/O Memory Read/Write for CPU Units
Service Service
code
Byte Data Read 1C Hex
Word Data 1D Hex
Read
Byte Data Write 1E Hex
Word Data 1F Hex
Write
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 represents 1 byte.
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
Class ID Instance ID
2F Hex 00 Hex
Class ID Instance ID
2F Hex Specifies
area (01 Hex
to 14 Hex)
6 Message Communications
Request ser-
vice data
Attribute ID = Reads the operating mode of the
64 Hex CPU Unit.
Attribute ID = Reads if there is a Controller error
65 Hex the CPU Unit.
Attribute ID = Reads CPU Unit model.
66 Hex
Attribute ID = Changes the operating mode of the
64 Hex, CPU Unit.
Attribute Value
Attribute ID = Clears errors.
65 Hex
Attribute Value
None Reads the detailed status of the CPU
Unit.
Operation status: Stop, run
Operating modes: PROGRAM, RUN
Request
service
data
Address, Reads the specified node data in byte
No. of read units. The word data is read in order, from
bytes high to low bytes.
Read data: 200 bytes max.
Address, Reads the specified node data in word
No. of read units. The word data is read in order, from
words low to high bytes.
Read data: 100 words max.
Address, Writes the specified node data in byte units.
word data The word data is specified in order, from
high to low bytes.
Write data: 200 bytes max.
Address Writes the specified node data in word
word data units. The word data is specified in order,
from low to high bytes.
Write data: 100 words max.
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