Omron SMARTSLICE - 04-2008, Operation Manual

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DeviceNet Explicit Messages Appendix A
Using Explicit Messages
The following example shows how to use explicit messages with a DeviceNet Communications Unit connected
to a CS1W-DRM21 DeviceNet Master Unit.
Example: Sending a “Unit Maintenance Present Value Read” command to the DeviceNet Communications
Unit.
Example: DeviceNet Master Unit’s node address: 05
Unit number: 0
Unit address: FE Hex (or 10 Hex)
DeviceNet Communication Unit’s node address: 11
Operation
Reads the Unit maintenance PV of the Slice I/O Terminal’s DeviceNet Communications Unit.
The data is read using the EXPLICIT MESSAGE SEND command (2801).
The command data is written in words starting from D01000 in the PLC and the response data is stored in
words starting from D02000.
If the command does not end normally, the end code is stored in D00006 and the send command is re-exe-
cuted.
CMND
C
S
D
DeviceNet Master Unit
Ladder program
Explicit message
sent
DeviceNet
Network
Unit maintenance
present value
Slice I/O Terminal