7
Serial Communications Connection Procedure
7.4. Serial Communication Status Check
Start the send/receive processing and confirm that serial communications is performed
normally.
Always ensure safety before wiring the I/O in the state where the devices are
powered OFF.
Always read and follow the information provided in all safety precautions in the
manuals for each device to be wired.
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. Checking the Receive Data
Check that the correct data is written to the I/O memory of PLC using CX-Programmer.
Expand the Programs tree in the
project workspace of
CX-Programmer and
double-click Section1.
The Ladder Section Window
shows the Section1 ladder
program.
Ladder Section Window
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