User manual

Detailed descriptions of I/O modules | Digital counter module UR20-2CNT-100
157Manual u-remote1432790000/03/02.2014
Primary counting direction down
– Down-counting from the load value
– If the end value +1 is reached during counting in the
negative direction, the counter jumps to the load value at
the next count pulse and continues counting from there.
In addition, a process alarm can be triggered if it is
parametrized.
– It is possible to count beyond the lower count limit.
Countingrange
Limits Validrangeofvalues
Lower count limit –2 147 483 647 (–2
31
) to [phone] (2
31
–2)
Upper count limit [phone] (2
31
–1)
Upper
count limit
Load value
End value
0
Gate start Gate stop
Counter state
Time
Periodiccounting,primarycountingdirectiondown.
Additional counter features
Overview
You can set the additional features listed below for the coun-
ter by parametrizing the UR20 2CNT-100:
– By entering a comparison value, the digital output is acti-
vated or a process alarm is triggered depending on the
counter value
– Hysteresis
It is possible to prevent frequent switching of the output
and/or triggering of the alarm, e.g. when the value of a
sensor signal fluctuates around the comparison value, by
setting the hysteresis
The gure illustrates how counting behaviour is affected
by the additional features. These additional features are ex-
plained in the following pages.
Internal gate
Comparison value Process alarm
Comparator
Hysteresis
Counting value
Load value
SW gate Pulse/track A
Pulse evaluation
Direction/track B
Additional counter functions.