How Do I Make an Alarm Auto-acknowledge using Lookout 6.0? Primary Software: LookoutPrimary Software Version: 6.0 Primary Software Fixed Version: 6.0 Secondary Software: N/A
Problem: I have a Pot object that I have set up some alarms on. For example, if the Pot value exceeds 60 I generate an alarm with condition 'Hi' and priority '5'. The value of my Pot is connected to a register that continuously fluctuates between 58 and 61. When this happens, my alarms window gets filled with alarms. How can I limit this to show only 1 alarm? Solution: The number of alarms in this case can be limited by entering an appropriate expression in the acknowledge data member of the Alarm object. Right click on the Alarm object and select Edit Connections.... Next in the 'Writable Members' box scroll down and pick the 'ack' data member. Once the ack data member is highlighted click on the 'Select' button. The Logical Connection box should now turn yellow. The left side of the expression should say '$Alarm.ack='. Now inside the 'Signals' box, navigate to your computer and then to the process in which the Pot exists. Click on the Pot object. On the right hand side, a list of readable members should have been populated. Highlight the 'Value' data member and then click on 'Paste'. The right hand side of the expression should say 'Pot.Value'. Now set the condition which would cause the alarm to be acknowledged. In this case we can set Pot.Value<60. Note: In the expression 'Pot.Value', 'Pot' is the name assigned to that particular Pot object and 'Value' is the datamember being read from. By setting this condition, the alarm that is generated when the Pot value exceeds 60 will automatically be acknowledged when its value falls below 60. This way, there will only be 1 alarm for this specific condition displayed on the alarm window at any time. Another option to obtain a similar results would be to use a Deadband with a value of 2. This way when the value of the Pot is within 2 of the alarm condition, a new alarm is not generated. The difference between this method and the one mentioned above is that by using a Deadband a new alarm is not generated every time the Pot value goes above 60. Hence the value in the Time section of the Alarms window does not update. If it is important to keep track of the last time the Pot value went above 60, use the first method, else use the deadband option. Related Links: Attachments:
Report Date: 10/12/2005 Last Updated: 10/26/2005 Document ID: 3QBDM86K |
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