5. Appendix
275
5.1.5 Checking the I/O Data on the PLC
[1] Start CX-Programmer.
[2] Click the [Switch Watch Window] button on the toolbar.
[3] Register the tag names “W0” and “W1” in the “Address” fields of the “Watch Window,” and the current
values of the registered tags will appear in the “Value” fields.
The description of each device is given below:
Tag name Description
W0
Controller PLC output
W1
PLC Controller output
[4] Change the value of “W1” in the “Watch Window” and also change the controller output data, and check if
the controller’s I/O port data match the values of tags “W0” and “W1.”
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