Serial Communication Status Check - Omron CJ Series Connection Manual

7.4. Serial Communication Status Check

Start the send/receive processing and confirm that serial communications performs normally.
If the PLC memory is changed by malfunction during monitoring power flow and
present value status in the Ladder Section Window or in the Watch Window, the
devices connected to output units may malfunction, regardless of the operating
mode of CPU Unit.
Always ensure safety before monitoring power flow and present value status in
the Ladder Section Window or in the Watch Window.
Precautions for Correct Use
Check that the serial cable is connected before performing the following procedure.
If it is not connected, turn OFF the each device, and then connect the serial cable.
7.4.1. Starting the Trace
Start tracing with CX-Protocol.
1
Select Operating Mode -
Monitor from the PLC Menu.
2
The confirmation dialog box on
the right is displayed. Confirm
that there is no problem, and
click Yes.
3
Check that the operating mode
changes to Monitor Mode.
Double click
NewPLC1.
4
The tree under
expands. Select Serial
Communications Unit.
(SCU [0] is selected on the
right).
7．Serial Communications Connection Procedure
NewPLC1
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