Verifying the Ladder Diagram

Verify Operation

After a ladder diagram has been created in EZ LADDER® , the next step is to verify the ladder diagram and check for any errors.

To verify the ladder diagram:

1. Press the VERIFY button on the tool bar. EZ LADDER® scan through the ladder diagram and look for any errors (open links and function errors). The results of the verify operation will be displayed in the Output window. The figure below shows the ladder diagram you created after verification. Notice the Output window is now displaying messages.

Understanding Output Window Messages

The messages displayed in the output window are used to provide general information and help in diagnosing ladder diagram errors. If an error is detected during the verification process, then it will be displayed. Below shows the same program, this time with a link error.

The Output windows shows two errors. These two errors are related.

1. The first is LINK ERROR. This identifies that there is a link missing at rung 1, column 2. This would signify the input contact is not connected to anything.
2. The second is the ERROR: Object GP00 .... This identifies that the output does not have anything connected to it (open link).

This link problem would need to be corrected before the ladder diagram can be compiled and loaded into a hardware target.

Note: The verification process can be skipped if desired because when the program Compile button is pressed, it automatically does a verification prior to compiling the ladder diagram.