The Siemens 6ES5 700-8MA11 bus module (also cataloged as 6ES5700-8MA11) is a two‑bus‑unit backplane interface card for SIMATIC S5 automation systems, designed to connect S5‑100U, ET 100U, and ET 200U configurations to the central bus backplane and expand the network with multiple bus nodes. It uses screw‑terminal blocks for I/O wiring and a 10‑pin bus connector to link to adjacent modules, aligning with the older S5 backplane architecture. The 8MA11 variant is listed alongside related versions such as 6ES5 700‑8MA22 in maintenance catalogs, confirming its role within the legacy Siemens S5 module family.
