PLC touch controller 4 channel I/O Stainless steel I illuminated push buttons allows sequence programming on an industrial PLC with no need for difficult programming for end user . 1-4 inputs. 1-4 outputs 24vdc sourced voltage outputs 1 amp internal relay , individual 0vdc common for each output . Inputs require only a dry contact or switch. No source voltage necessary . Audio on board , ambient and triggered audio , can upload desired audio files via USB port . Programming port allows for future revisions or direct access to the CPU for writing your own ladder logic. Or can be connected to rs232 for dmx output with a DMX 512 engine . Sold separately. Custom programming available for dmx addresses and on/off intensity values .