Configuration using the PC |
debounce times, use the seconds timer to avoid the inaccuracy introduced by the one minute resolution.
Default Debounce time: 0.05 sec
A Digital input port can also be used to perform special functions in the Cv2. In the Groups section, it can be selected for the Local Acknowledge function, and in the Hardware section it can be set to operate as a Reset Input for a Totalizer.
Watchdog Input
A Watchdog timer is used to monitor periodic events and will produce an alarm if the event does not occur within the programmed Watchdog interval. Each time an event occurs at the input, the timer is reloaded with the programmed value. When the timer has expired without a refresh event, the alarm is set. Refresh activities can be changes from low to high, changes from high to low, or both.
Watchdog input types use two timers for their operation: the Debounce timer and the Watchdog Interval timer. Refer to the preceding Digital input description for details on the Debounce timer. Two Watchdog time ranges, seconds and minutes, are available. The seconds range has a maximum value of 1638 seconds (27 minutes) with a resolution of 25 msec. For longer Watchdog times the minutes range should be used. When set to minutes, the Watchdog timer has a maximum value of 65,535 minutes with a resolution of one minute. For short Watchdog times, use the seconds timer to avoid the inaccuracy introduced by the one minute resolution. When setting the two timers, take into consideration the relationship between the two. The Debounce time can not be greater than the Watchdog Interval; otherwise a constant alarm condition will occur.
Default Watchdog time: 10 min
Interval Input
Interval timers measure the time interval that an input is active, either how long it is high or how long it is low. The input is conditioned by the Debounce timer which is described in the Digital input section. When setting the Debounce timer, consider the anticipated duration of the interval. Since the Cv2 registers a change only after the Debounce time, long debounce settings will affect the accuracy of the measurement.
Totalizer Input
Totalizer inputs measure the number of times that an event has occurred at the input. The event can be a high to low transition, a low to high transition, or both. Before the change is considered valid, it is conditioned by the Debounce timer - described in the Digital input section. Take into consideration the expected time period between events when setting the Debounce timer.
The count in the totalizer can be reset by two methods: by sending the Reset Code entered in the Points section, or by using the Reset Input selection in the Hardware setup.
B1272M001 | BARNETT ENGINEERING LTD. | ProTalk Cv2 |
