Programmable Logic Controller (PLC)

Programmable Logic Controller (PLC) systems primarily use lithium batteries (specifically Lithium-Thionyl Chloride chemistry) to provide backup power for volatile RAM memory, preventing the loss of programmed logic and configuration settings during power outages. Other chemistries like nickel-cadmium, lead-acid, and alkaline are also used in some specific industrial applications, but lithium is the most common.