Emerson Exchange 365

In v13 this would be very easy to do because there are two different alarm fields for this (OOS-logic use & OPSUP-Operator Shelving) but any other version of DeltaV you will have a very difficult (if not impossible) time doing this because there is only the OPSUP parameter field and the Alarm Enable. You would have to rely on 'other' methods than the alarm suppression summary I describe below to get this accomplished in pre-v13 systems.

In v13 when configuring the Alarm Summary ActiveX object, you can select on the More Filters tab the options Shelved and/or Removed from Service (OOS). Note that the Alarm Summary Type needs to be set to Suppressed Alarms to be able to get to these selections. Your logic would use the OOS bit and OPSUP would be used for Operator Shelving but this still might not be entirely correct unless you change the OOS field security to a higher level so that unauthorized people can't turn it on from right clicking the alarm on the alarm summary or the OOS checkbox on the Detail display. I've have been suggesting also using the OOS for Maintenance personnel to use while they work on a device and not give any alarms while it is being worked on instead of using Operator Shelving. You can use the Suppression Reason to indicate the reason and have "By Logic" reason set by the logic and that reason not be selectable and be alot more visible of which is by logic or not.

The big difference between these two alarm fields is that the OOS doesn't have a timeout while the OPSUP does and can be configured so when shelved it would turn itself back on when the time expires. Note that if the timeout for an alarm is 0 then it can NEVER be Shelved.

In reply to Kent:

Kent, we held a Live event in October that featured 5 Alarm experts, one of which is guru, Matt Stoner . TONS of great information on topics related to alarm management can be viewed in the EE365 community here: http://emrsn.co/alarmexperts

Best Regards,

Rachelle McWright: Business Development Manager, Dynamic Simulation: U.S. Gulf Coast

In reply to Kent:

Also forgot to mention that you should probably have the logic be a one shot and not continually writing to the alarm OOS and SUPRSN. This would allow someone to manually do things without thinking the system is broke.