Omron CJ1W-DRM21 - List of PLC Object Services

6-17
6 Message Communications
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
6-3 Receiving Explicit Messages
6
6-3-1 List of PLC Object Services
PLC Objects provide the following services.
z Status Read/Write for CPU Units
z I/O Memory Read/Write for CPU Units
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.
6-3-1 List of PLC Object Services
Services Service
code
Class ID Instance ID Request ser-
vice data
Contents
CPU Unit Informa-
tion Read
0E Hex 2F Hex 00 Hex Attribute ID =
64 Hex
Reads the operating mode of the
CPU Unit.
Attribute ID =
65 Hex
Reads if there is a Controller error
the CPU Unit.
Attribute ID =
66 Hex
Reads CPU Unit model.
CPU Unit Write 10 Hex Attribute ID =
64 Hex,
Attribute Value
Changes the operating mode of the
CPU Unit.
Attribute ID =
65 Hex
Attribute Value
Clears errors.
CPU Unit Status
Read
40 Hex None Reads the detailed status of the CPU
Unit.
Operation status: Stop, run
Operating modes: PROGRAM, RUN
Service Service
code
Class ID Instance ID Request
service
data
Contents
Byte Data Read 1C Hex 2F Hex 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
low to high bytes.
Read data: 100 words max.
Byte Data Write 1E Hex Address,
word 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 low to high bytes.
Write data: 100 words max.