Siemens 6ES5945-7UA13 Interface Module For S5 PLC

Siemens 6ES5945-7UA13 is the CPU 945 central processing unit (control board) for the SIMATIC S5-115U PLC, delivering 256 KB of RAM and including a slot for an additional interface module to extend communication options. It provides a 1 x 20 mA current-loop interface (TTY) for OP/PG/PC and SINEC L1, accessed via a 15‑pin Cannon socket, and supports V.24 communications through RS-232C and RS-422/485 interfaces for programming devices or terminals. The module also includes a dedicated slot for a MC 374 memory card (Flash EPROM) to store programs or data, enabling persistence between power cycles. As part of the S5-115U family, the 6ES5945-7UA13 serves as a CPU/central control board that pairs substantial RAM with expandable I/O connectivity, a configuration commonly encountered in legacy Siemens S5 installations and suitable for repair, maintenance, or continuation of older automation lines.