Thank all who responded, but I am actually looking for a counter block that will allow the selection of a rising/falling edge as a trigger. Not for programming but for research that I am doing on a legal case. When I have done PLC programming, I would never have thought about such a requirement and would just have inverted the signal if needed. But this is a special instance, so I thought I would ask this community. I have gone through a number of different PLC manuals as well as SCADA software and can't find a block that will allow edge detection configuration.