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Connect a button to the OperShelve tag

Studio 5000 Logix Emulate (Virtual PLC)
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OperShelve

The alarm instruction only processes the OperShelve tag on transition from cleared to set to prevent unwanted reshelving of the alarm. For example, if an operator presses a push button to shelve the alarm while the ProgUnshelve tag is set, the alarm is not shelved because the ProgUnshelve tag takes precedence. To shelve the alarm, the operator can release and press the push button again once ProgUnshelve is cleared.

Affects Math Status Flags

 

Controllers Affected Math Status Flags
CompactLogix 5380, CompactLogix 5480, ControlLogix 5580, Compact GuardLogix 5380, and GuardLogix 5580 controllers Conditional
CompactLogix 5370, ControlLogix 5570, Compact GuardLogix

5370, GuardLogix 5570 controllers

Yes

 

A minor fault will occur if: Fault Type Fault Code
The input value is INF or NAN for CompactLogix 5370, ControlLogix 5570, Compact GuardLogix 5370, GuardLogix

5570 controllers only.

4 4

 

See ftath Status Flags.

Tags: connectOperShelvetag
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The objectives of PLCtr are to provide practical instruction and help for anybody involved with PLCs from the maintenance staff to the PLC programmer. You don’t necessarily have to be a “writer” to contribute. If it has anything to do with any PLC and the devices connected to it then we are interested. If you want to become a writer, please write to us on the contact page. Join us.

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