Table Of Contents

Setting Faults to Trigger Fail-Safe Mode

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    Last Modified: May 15, 2018

    The Faults table populates based on the channel configurations you select.

    Figure 1. Faults Table

    If you check the Module failsafe box next to a fault, that fault will trigger the module to go into Fail-safe Mode. Checking the box also reserves that signal so it cannot be used in the state machine diagram. If you leave the box unchecked, you can use that signal as an input to trigger transitions in the state machine diagram.

    To set Module failsafe for overcurrent faults on digital input and digital output configurations, select Failsafe from pull-down menu in the Overcurrent recovery column.

    spd-note-caution
    Caution  

    All fault signals listed in the Faults table must have the Module failsafe box checked or must be used as transition conditions in the state machine diagram. If a fault occurs and that fault signal is not configured, the fault will not be handled by the User Program.

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    Tip  

    You can copy and paste the fault name to avoid retyping it in the state machine diagram. Click on the fault name and press <Ctrl-C> to copy the fault name in the I/O Configuration table. If you're using the Functional Safety Editor 2018 or later, output signal values and transition conditions have a predictive text feature that allows you to choose from a list of available faults.


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