To use Micrologix 1400 (1766-BXB, 1766-BXBA…) built in high speed counters, you need to setup the followings:
Setup of High Speed Counter
- Enable high speed counter in Controller -> Function Files
- Change input filter from default (8ms for 63 Hz) to whatever filter is suitable. The number shown is shown for ON then OFF. So a 0.005ms is suitable for 100 kHz (1 / [5*10^(-6) + 5*10^(-6)]). If you leave it at default filter, inputs can not handle any state change with frequency higher than 63 Hz.