There are two options to connect the signals: (Option 1) The default settings of the connections are AXIS 1~4. The PIN assignments are shown as below: The wiring diagram is shown as below (outside DC24V power is required): (Option 2) Go to the “PARAMETER (RIO Setting)” page and check to enable the input signal from the Remote I/O board. Based on the enabled port and axis, pin connections will start from X256. Each axis occupies 3 DI pins defined as positive limit, negative limit and zero point.