The Siemens 6ES7740-0AA01-1XA0 is a CD-ROM retrofit kit for the PG 740 programming device, described as Nachruestsatz CD-ROM-Lw. PG 740.
What It Is
This is a retrofit accessory — a CD-ROM drive assembly intended for the Siemens PG 740 field programming unit, used in industrial automation environments for programming PLCs and HMIs on the shop floor.