What limits the number of virtual input and output instructions in a plc ladder logic program?12/1/2023 ![]() ![]() When the beam is broken by a passing object on the conveyor belt, the input channel de-energizes, causing the virtual contact IN sensor object to “close” and send virtual power to the “CU” input of the counter instruction. The normally-closed virtual contact (IN sensor object) is typically held in the “open” state when the light beam is continuous, by virtue of the fact the sensor holds that discrete input channel energized while the beam is continuous. ![]() This particular counter instruction (CTU) is an incrementing counter, which means it counts “up” with each off-to-on transition input to its “CU” input.
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