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SA Project - Info Zone - Interlock Permissives

Chris

Hello,

Wondering if there is a way to add simple permissives to this list without needing to add Equipment References. I have permissives in PLC logic that I have an Equipment item (DIGITAL Tag), and simply would like to configure a list here. Those PLC permissives are sometimes based on complex calculations performed in the controller and can't be tied to a simple, "Valve is opened", "Temp is above the Low Limit" types of references.

Thanks,

Chris

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  • Alexander,

    Since part of the interlock are configured in the Runtime Parameters, you need to specify an item (DIGITAL or INT with 0/1) in the Value field. You just tie a PLC variable tag to that Equipment's item. Perform the logic in the PLC that controls the value of the item.

    Be aware that you'll need to create an additional Alarm category for the interlocks in order for you to hide the alarm from the active alarm page. You'll need to add an alarm to the item with your new category.

    You will then need to setup the Equipment references. This will tie the two things together for the interlock to finally work. We currently only have simple interlocks, like you can't open a vent valve until the block valve is closed. We have plans to add enhanced interlocks in the near future.

    All that being said, we don't use any of the interlock bypass functions due to the the nature of our operation. So if you need to use the bypass feature, that'll be something I have no experience with.

    Hope this helps you,

    Chris
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  • Alexander,

    Since part of the interlock are configured in the Runtime Parameters, you need to specify an item (DIGITAL or INT with 0/1) in the Value field. You just tie a PLC variable tag to that Equipment's item. Perform the logic in the PLC that controls the value of the item.

    Be aware that you'll need to create an additional Alarm category for the interlocks in order for you to hide the alarm from the active alarm page. You'll need to add an alarm to the item with your new category.

    You will then need to setup the Equipment references. This will tie the two things together for the interlock to finally work. We currently only have simple interlocks, like you can't open a vent valve until the block valve is closed. We have plans to add enhanced interlocks in the near future.

    All that being said, we don't use any of the interlock bypass functions due to the the nature of our operation. So if you need to use the bypass feature, that'll be something I have no experience with.

    Hope this helps you,

    Chris
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