GE Fanuc IC660BBD024 12/24 VDC 32-Circuit Source I/O BlockDescription Type: 12 24 VDC 32 Circuit Source I O Block Function: Sends current to field output devices and interfaces the controller to devices that send or receive binary signals. Compatibility: Works with electronic proximity switches (2 wire and 3 wire configurations) and other input devices. Specifications I O Channels: 32 identical discrete circuits Configuration: Each circuit can be set as input, output, or output with feedback. Protection: