When measuring the position of moving targets in production and process automation environments, it is important to understand the different methods of sensor triggering, their impact on measurement cycle times and the benefits they can offer over continuous measurement.
Triggering is a term often used in sensing and measurement technology and includes all the different methods of initiating a measurement or a controlled output of measurement data.
Particularly in production and process automation environments, in order to reduce the system load on any downstream monitoring and control units, a permanent measurement output is often not the best approach. Instead, the sensor should wait for a signal from an external source that specifies the time for a measurement to take place, thus initiating the output of data. Triggering is therefore often initiated by an external signal.
It is important to understand the different triggering methods available and their relationship to sensor measurement rate and cycle time, particularly in fast-moving processes.
Automation.com explains the edge triggering and level triggering methods, the related conditions and applications for each.
>Read more by Chris Jones, Automation.com, May 17, 2016