Using Time Sampled Rate Counting; Using Frequency Counting - Siemens SIMATIC TI505 User Manual

Using Time
Sampled Rate
Counting
Using Frequency
Counting
High Speed Counter Encoder Module User Manual
In time sampled rate counting, the counter counts the number of input
pulses during a given period. You select the sample period (1 ms, 10 ms,
100 ms, or 1 second) by setting the appropriate bits in the preset word and
by setting the control jumpers to [Internal Period] and [Reset-and-go].
The counter is reset at the start of the sample period, and the value is
loaded into Holding Register 1 at the end of the sample period. At the next
INDEX signal, the new count value is loaded into Holding Register 1, and
the previous value is pushed into Register 2.
Frequency counting mode provides a counts-per-second value. You select the
sample period of 1 second by setting the appropriate bits in the Preset word
and by setting the control signal jumpers to [Internal Period] and
[Reset-and-go].
The counter is reset at the start of the sample period, and the value is
loaded into Holding Register 1 at the end of the sample period. At the next
INDEX signal, the new count value is loaded into Holding Register 1, and
the previous value is pushed into Register 2.
Applications A-3