Westermo IDW-90 - Manual (Page 11)

11 6620-2200
2. Pulsed Input
When input is set to edge trigged pulsed the number of pulses counted selects the
entry to be trigged.
For the pulsing of an input, some timings must be kept.
The input is filtered and pulses shorter than ta is discriminated. The time between
pulses must also be kept shorter than T
p
. One other restriction on T
p
. Is that T
p
.³ 2t
a
.
When time between pulses exceeds T
p
the number of pulses are accumulated and an
entry selected by number of pulses counted.
The parameter ta is also used when output pulsing is selected.
The parameters ta and t
P
are programmable from 10 ms to 2550 ms.
≥t
a
≤T
p
>T
p
≥t
a
≤T
p
>T
p
Positive edge trigged input timing
Negativ edge trigged input timing
Number of pulses counted
accumulated here