Sequence Of Continuous-Action Measurement - Siemens SIMATIC ET 200S Operating Instructions Manual

1Count5V
3.7 Measurement Modes
3.7.2

Sequence of continuous-action measurement

Measuring Principle
The 1Count5V counts each positive edge of a pulse and assigns it a time value in µs.
The update time indicates the time interval at which the measured value is updated by the
module in the feedback interface.
Rule for pulse sequences with one or several pulses per update time:
Dynamic measuring time = Time of last pulse in the current update time interval
When the update time has elapsed, a new measured value is calculated and output with the
dynamic measuring time.
If the current update time does not contain a pulse, the following dynamic measuring time
results:
Dynamic measuring time = Time of current, elapsed update time
When the update time has elapsed, an estimated measured value is calculated with the
dynamic measuring time under the assumption that a pulse occurred at the end of the
update time.
166
minus
Time of last pulse in the previous update time interval
minus
Time of last pulse
Technological Functions
Operating Instructions, 06/2010, A5E00124867-07