Missing Pulse Detection

Missing Pulse Detection alerts you when a new pulse is not available to count within a configurable time period. When a missing pulse is detected, the Missing Pulse Alarm is triggered.

To use Missing Pulse Detection, you must complete the following steps:

Configure the Missing Pulse Alarm Limit to establish the maximum length of time between pulses before which the Missing Pulse Alarm is triggered.
Go to Module Properties → Counterxx → Alarm to set the Missing Pulse Alarm Limit.
Set the
O.Counterxx.MissingPulseAlarmEn
tag to 1.
If this tag is not set to 1, the alarm is not enabled and you are not alerted when a missing pulse occurs.

When the Missing Pulse Alarm is triggered, the

I.Counterxx.MissingPulseAlarm

tag goes to 1.

Missing Pulse Detection is commonly used in high frequency applications. A missing pulse typically indicates the loss of a counting device, for example, an encoder. The loss of a counting device often has a significant impact on the application conditions and immediate system action is used to account for the impact.