Checking The Serial Communications - Omron CJ Series Connection Manual

7.4. Checking the Serial Communications

Start the send/receive processing and check that serial communications are normally
performed.
If the PLC memory is changed by malfunction during monitoring power flow and
present value status in the Ladder Section Window or monitoring present values
in the Watch Window, the devices connected to output units may malfunction,
regardless of the operating mode of CPU Unit.
Confirm safety sufficiently before monitoring power flow and present value
status in the Ladder Section Window or in the Watch Window.
Precautions for Correct Use
Check that a serial cable is connected before performing the following procedure.
If it is not connected, turn OFF the power supply to each device, and then connect a serial
cable.
7.4.1. Checking the Receive Data
Check that the correct data is written to the I/O memory of PLC by using CX-Programmer.
1
Expand the Programs tree in the
project workspace of
CX-Programmer and
double-click Section1.
The Ladder Section Window
shows the Section1 ladder.
2
Select Operating Mode -
Monitor from the PLC Menu.
7．Serial Communications Connection Procedure
Ladder Section Window
31