Editing Programmable logic controller (section)

===Programming device===
Manufacturers develop programming software for their PLCs. In addition to being able to program PLCs in multiple languages, they provide common features like hardware diagnostics and maintenance, software debugging, and offline simulation.<ref name=":7" />

PLC programs are typically written in a programming device, which can take the form of a desktop console, special software on a [[personal computer]], or a handheld device.<ref name=":7">{{Harvnb|Bolton|2015|pp=19–20}}</ref> The program is then downloaded to the PLC through a cable connection or over a network. It is stored either in non-volatile [[flash memory]] or battery-backed-up [[RAM]] on the PLC. In some PLCs, the program is transferred from the programming device using a programming board that writes the program into a removable chip, such as [[EPROM]] that is then inserted into the PLC.