Before PCs were standard on the factory floor, programming was often done via the handheld terminal.
The is a legendary piece of industrial history . Though it was eventually succeeded by the Modicon and Magelis lines after Schneider Electric acquired Telemecanique, thousands of these micro-PLCs are still humming away in factories globally.
The TSX 17 uses internal RAM backed by a battery. If that battery dies and you don't have a backup of the program saved via the PL7 software, the PLC becomes an expensive paperweight. Always upload and save the program before attempting any hardware maintenance.
Required for the TSX 17-20. This version supports more complex operations, including analog processing and advanced data manipulation.