Siemens Metro 21 M216KA, Руководство оператора

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13-4
ET 200L, ET 200L-SC and ET 200L-SC IM-SC Distributed I/O Device
EWA 4NEB 780 6009-02c
13.3 Functions of the Counter Module
Section Topic Page
13.3.1 24V Pulse Initiator With/Without Direction Indicator 13-7
13.3.2 Gate Function 13-8
13.3.3 Digital Output 13-9
The counter begins at the lower count limit.
If the counter reaches the upper limit when counting upward and there is then
another count pulse, the counter jumps to the lower limit and starts to count
the count pulses again, thus counting continuously.
If the counter reaches the lower count limit when counting downward and
there is then another count pulse, the counter jumps to the upper count limit
and starts to count downward from there.
Upper count limit
Lower count limit
Counter status
Time
Figure 13-3 Continuous Upward Counting
Upper count limit
Lower count limit
Counter status
Time
Figure 13-4 Continuous Downward Counting
Contents of the
Section
Continuous
Counting
The 1COUNT40kHz Counter Module