B&B Electronics I3A12X_20B05-SOHF - Manual - Manual (Page 17)

Counter Set up
There can be two types of counters, Up Count and Down Count. All the counters
increment / decrement the current value on the positive edge of a defined input and
require a Reset input.
An up counter will increment its current value from 0 to the preset value at which
point the output is energised. A down counter will decrement its current value
(starting at a value equal to the Preset) until the current value reaches 0 at which point
the output is energised. Both counters will overtake the preset if input pulses continue
to be applied to the counter after the output is energised.
Consecutive
registers (2)
Set point can
be a register
or a constant
Counter type
Select the
Reset input
Input to
counter
output
reset
Preset value
Current
value Starting
counter
register
The count value
has reached the
preset energising
the output.
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