Validate the step program

Step validation helps you track down errors by checking the syntax of your step program and reporting any missing settings. The results of the validation appear in the Sequencer Program Validation Output area at the bottom of the Sequencer Editor panel.

Common errors are:

• If a Jump Trigger or Jump Timer Mode is assigned to a step without a Jump Destination Step being assigned

• If transitions that are configured as Retentive or Non-Retentive Delay do not have Triggers assigned

• If "On True", "On False" and "Data Change" Trigger Types are used for Non-Retentive or Retentive Timer modes

• If Jump Trigger or Jump Timer Mode is selected for each step and Jump Step Name is blank

Common warnings are:

• Input and Output references are empty.

• Input and Outputs references configured as "---.---"

To validate the step program

1. Select the Step Program tab. The Step Program panel appears.

2. Select the Validate button.

3. Check for possible errors and warnings in the Sequencer Program Validation Output area at the bottom of the Sequencer Editor panel.

   

   Caution: If you update the attributes PrgStepProgram and PrgAliasConfig with GRAccess, invalid entries, such as duplicate or invalid step names are not detected by the Sequencer object. Make sure you only pass valid Sequencer configuration to these attributes when using GRAccess.