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

1Count24V/100kHz
2.7 Measurement Modes
2.7.2

Sequence of continuous-action measurement

Measuring Principle
The 1Count24/100kHz 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.
The following applies for a pulse train with one or more pulse trains per update time:
Dynamic measuring time =
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 =
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.
56
Time of last pulse in the current update time
interval
minus
Time of last pulse in the previous update
time interval
Time of current, elapsed update time
minus
Time of last pulse
Operating Instructions, 02/2007, A5E00124867-05
Technological Functions