Grainger supplies all the PLC software and PLC accessories you need to maintain and properly run programmable logic controllers. We offer software to interpret data, cable connectors for relay to PC connections, battery packs for powering devices and extension modules for added features. Make your production facility more cost effective and upgrade your PLC today. Add memory or find a relay to PC cable to run your PLC from a computer. You can find a new color PLC display screen or accessories for your shaft encoder. Find everything you need for accurate tracking of high speed production right here at Grainger.