6-3
6 Message Communications
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
6-1 Overview
6
6-1-2 Explicit Message Communications
You can send service requests to DeviceNet masters and slaves made by other manufacturers and
OMRON slaves (C200H I/O Link Units, CS-series DeviceNet Units, etc.) with the use of explicit mes-
sages defined for DeviceNet.
Service requests to read/write CPU Unit status and I/O memory can also be received from PLCs with
C200H-series DeviceNet Units (C200HW-DRM21-V1), PLCs with CVM1/CV-series DeviceNet Units
(CVM1-DRM21-V1), PLCs with CS/CJ-series DeviceNet Units, and DeviceNet masters made by other
manufacturers using explicit messages.
Additional Information
A specific command (2801) is used to send explicit messages.
* A specific command (2801) is used to send explicit messages.
Additional Information
This CJ-series DeviceNet Unit (CJ1W-DRM21) contains a PLC Object so that the I/O memory of
the CPU Unit of this DeviceNet Unit can be read/written from other devices. The C200H I/O Link
Unit (C200HW-DRT21) and CS-series DeviceNet Unit (CS1W-DRM21(-V1)) also contain a PLC
Object so that you can read/write the I/O memory of the CPU Unit of the C200H I/O Link Unit
from other devices. The C200HW-DRM21-V1 and CVM1-DRM21-V1 DeviceNet Master Units,
however, do not have PLC Objects, the I/O memory of the CPU Unit for these Units cannot be
read or written from other devices.
6-1-2 Explicit Message Communications
Item Sending Receiving
Network com-
munications
instruction
You can use the SendCmd instruction using com-
mand code 2801 hex to send explicit messages to
DeviceNet Units.*
Automatically responds to explicit messages
from other devices.
Remote devices
and supported
functions
• DeviceNet masters and slaves made by other
manufacturers. Supported services determine
supported functions.
• DeviceNet masters made by other manufac-
turers
• PLCs with CS/CJ-series DeviceNet Units.
• PLCs with C200H-series DeviceNet Master
Units.
• PLCs with CVM1/CV-series DeviceNet Master
Units.
• All listed devices support status read/write and
I/O memory read/write for the local CPU Unit.
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