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Hi All,
The following is my query with regards to Alarm Handling in a AI channel -
I have a Analog Input and Analog Output card connected to a redundant PLC pair. For the AI card, the configured alarm limits for HH, H, L & LL are 90%, 80%, 30% and 20% respectively.
Now, the following is the behavior observed. When the process value connected to the input channel exceeds 90%, both the HH and H alarms flag bits turn ON. Again, when the PV starts decreasing and goes below the HH Limit (for example if PV is 85%), the HH alarm flag bit does not get reset. Again, when the PV falls below the H limit (for example if PV is 75%), both the HH & H flags are reset.
Is this the correct behavior or should the HH flag be reset once the PV goes below the HH limit (ie if PV is 85%)? Kindly help me out with this.
Regards,
Vivek
The following is my query with regards to Alarm Handling in a AI channel -
I have a Analog Input and Analog Output card connected to a redundant PLC pair. For the AI card, the configured alarm limits for HH, H, L & LL are 90%, 80%, 30% and 20% respectively.
Now, the following is the behavior observed. When the process value connected to the input channel exceeds 90%, both the HH and H alarms flag bits turn ON. Again, when the PV starts decreasing and goes below the HH Limit (for example if PV is 85%), the HH alarm flag bit does not get reset. Again, when the PV falls below the H limit (for example if PV is 75%), both the HH & H flags are reset.
Is this the correct behavior or should the HH flag be reset once the PV goes below the HH limit (ie if PV is 85%)? Kindly help me out with this.
Regards,
Vivek