Continuum I/O System Reference
49
Counting Pulsing Signals or Contact Closures
Counter inputs are designed to allow the monitoring of digital pulse trains or contact
closures across an input just like digital inputs, but they accumulate a total of those
closures and act like a counter.
Interfacing is similar to a digital input, however, you set the Electrical Type attribute to
Counter
instead.
When using an input as a counter, you must take into account the frequency of the input
signal being counted. Inputs 3-8 do not allow for very high speed contact counting. These
channels allow counting up to a maximum of 10 Hz or 10 contact closures or digital
pulses per second.
In high-speed mode, channels 1 and 2 can be configured (via front panel switch) to count
to a maximum of 10Khz or 10,000 contact closures or digital pulses per second.
Counter Duty Cycle
To achieve the maximum counter frequency, the amount of time the signal is ON as
opposed to being OFF must be at least 125 milliseconds.
DI-8
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