Siemens SIMATIC ET 200SP - Page 59

The basics of counting, measurement and position detection
2.2 Basics of counting, measuring and position input (TM Count, TM PosInput, Compact CPU)
Counting, measurement and position detection
58 Function Manual, 12/2017, A5E32009889-AG
Period measurement
The reciprocal of the frequency is output as the measured value for period measurement.
A value "25 s" is returned until the first measured value is available.
Velocity measurement
The normalized frequency is output as the measured value in velocity measurement. You
can configure the scaling using the time basis and the number of increments that your
encoder delivers per unit.
Example:
Your encoder delivers 4000 increments per meter. The velocity is to be measured in meters
per minute.
In this case, you need to configure 4000 Increments per unit and a time basis of one minute.