4-Port Digital Input Board is a PHPoC smart expansion board, which is designed to monitor on/off state of high-voltage devices. By stacking on PHPoC Blue or Black, this board can be controlled by PHPoC Blue/Black via a definite set of commands, through a specific port.
Each 4-Port Digital Input Board carries four photocouplers. A single PHPoC Blue or Black can carry multiple 4-Port Digital Input Boards.
Two different types of terminal blocks are available, based on the direction of the terminal screws. S-type can be screwed from the side, convenient when the multiple boards are stacked. T-type is screwed from the top of the board. The wire termination blocks are on the side of the board in both models.