Siemens 6ES5734-1BD20

Siemens 6ES5734-1BD20 is a PC/RS232 programming cable built for legacy SIMATIC S5 PLCs, enabling a direct serial connection between a computer and the S5 controller to load programs, exchange configuration data, and support diagnostic communications in aging automation installations. The cable runs 3.2 meters in length and employs a 15-pin D-sub interface on the S5 side and a 25-pin D-sub interface for the PC side, aligning with Siemens’ S5 programming hardware, with an approximate weight of 278 g. It is catalogued as 6ES5734-1BD20 (also listed as 6ES57341BD20) and Siemens notes it as discontinued as of October 1, 2022, though surplus and service sources continue to supply this item for maintaining or refurbishing existing S5 systems.