Specifications

Hardware Configuration I/O Expansion Modules
VisiLogic: Getting Started 41
High-Speed Counters: I/O Expansion Modules
Certain digital inputs on certain I/O Expansion Modules are high-speed inputs
that can be used as a 16-bit high-speed counter of the following types:
High-Speed Counter
Uses the high-speed counter input alone, without
reset.
High-Speed Counter with Reset
Uses the High-Speed counter input
and the next-to-last digital input as the counter's reset. Note that Reset
occurs during Active High.
Frequency Measurer
Counts the number of pulses over the selected
period of time (sample rate): 100 mSec, 500 mSec, or 1000 mSec (1
second), expressing the number in Hertz. For example, 155 pulses
counted over 500 mSec is equal to 310Hz.
Configuring a High-Speed Counter
The linked operand contains the counter value which is current at the last
program scan. Use this operand in your program like any other.