Abstract: A high-speed input module for a programmable controller has two sensor inputs, one for receiving an indication of a sensed event and another or receiving an indication as to whether the count of such events should be incremented or decremented. Each input is coupled to a separate data latch which temporarily stores the respective indication. The output of the sensed event latch is connected to an interrupt line of the programmable controller. A shift register has a separate parallel input connected to the output of each latch and has a serial output for connection to a data input terminal of the programmable controller. The shift register transfers the sensed indications to the controller in response to clock signals received from the programmable controller.