Siemens 6ES5925-3SA11 Communication Interface Module

Siemens 6ES5925-3SA11 is a CPU 925 central processor module for the SIMATIC S5 family, configured for Zentralbaugruppe 150U/150S (ZG 150S/150U). It delivers the core processing for legacy automation tasks within S5-150U/S systems, consolidating control logic in a compact module. The unit measures 20 mm in height, 250 mm in length, and 200 mm in width, and weighs about 0.34 kg, making it a substantial but modular component in the S5 rack. As part of the 6ES5925 series, the 3SA11 variant corresponds to CPU 925 functionality for the S5-150U/S configurations. The product is described by Siemens and third‑party suppliers as a CPU 925, 150U/150S central processor module and is identified by the part number 6ES5925-3SA11. Be aware that this item has reached the end of its lifecycle and official Siemens support was discontinued on October 1, 2022; some suppliers offer refurbished or repaired units as replacements for aging installations. This CPU module is intended for legacy Siemens SIMATIC S5 systems, commonly used where the 150U/150S central bus architecture remains in operation, and is typically sourced when upgrading or maintaining older automation lines that still rely on the S5-150U/S control logic.