Eric,
Take a look at the program and the modifications I made. Service page has mode selector and timer input for setting your reset time for the trailing edge of your sensor. I've made some assumptions about your system, namely; that what you're asking for is a printer trigger "ON" from the trailing edge (in addition to the existing leading edge mode) of your input sensor (I1) which is digital in nature and thus will either be ON or OFF, and it would appear that the sensor would be ON through the duration of its sensing period and then OFF once the workpiece is no longer sensed, and THAT is what we're calling a "trailing edge", which is to say that the desired function is to trigger your printer on this trailing/falling edge of (I1) sensor. Modified nets are pink in color for reference.
MC810E_V2.03.vlp