During the WIN-911 runtime alarms can be disabled by placing them into bypass. Once these alarms are bypassed, they will stay bypassed over multiple sessions (shutdown/startups) until the user removes them. However there is a case where bypassed alarms are taken out of bypass automatically by WIN-911. The following document describes the current issue, the cause behind it, and possible ways to avoid it.
WIN-911 only allows the user to bypass “real” alarms. “Real” alarms are alarm points configured in WIN-911 that make a successful connection during runtime. If the user has an alarm point configured in WIN-911 but it does not exist in the data source or we are unable connect to a particular alarm point, this is not a “real” alarm. In this case when you run WIN-911 and select bypass you will not have the option to bypass this non-existent, configured alarm. The user will only see the alarm points that made a successful connection.
Similarly, if you have alarms bypassed and you restart WIN-911 but it is unable to connect to a bypassed alarm point WIN-911 removes it from the bypassed alarms since it is non-existent or not a “real” alarm. This is where the problem lies. If WIN-911 removes the alarm point from bypass because it failed to make a successful connection, that alarm is removed permanently. This means if you restart WIN-911 and we are now able to connect to that alarm point, WIN-911 does not put it back into bypass. The alarm point will need to be placed back in bypass. Here is a simple scenario where this can occur:
A user bypasses a group of alarms. The user then reboots the computer because of hardware changes. After rebooting the user manually starts WIN-911, except the user forgot to start the data server (iFIX, InTouch, RSView, OPC Server, etc.) first. WIN-911 says it cannot connect to any of the alarm points. At this point the user realizes that they forgot to start the data server so they shutdown WIN-911 and start the data server. Then the user restarts WIN-911. All the alarms placed in bypass are now no longer in bypass.
As long as WIN-911 sees the alarm points configured as “real” alarms your bypassed alarms will remain bypassed until a user removes them. If at anytime WIN-911 initializes and is unable to connect to a bypassed alarm point, the alarm is removed from the bypassed alarms list. Once a successful connection to the alarm point is made, the user must place the alarm back in bypass.