Siemens 6ES5942-7UB11 Central Processing Unit for SIMATIC S5

Core Processing Power for S5-115U Systems

The Siemens 6ES5942-7UB11 is a central processing unit (CPU) for the SIMATIC S5-115U programmable logic controller . This module executes the user program, processes I/O signals, and manages communication tasks within the S5 automation system. It supports the STEP 5 programming language for straightforward program development . Consequently, it provides reliable processing power for medium-performance industrial control applications.

Memory Capacity and Performance Specifications

This CPU features an internal program memory capacity of 10 KB for storing user logic and configuration data . It delivers a processing time of 1.6 µs per bit operation for efficient program execution . The 6ES5942-7UB11 also includes a receptacle for a 375 memory submodule (RAM/EPROM/EEPROM) to expand storage or protect programs from power loss . Furthermore, its built-in 20 mA interface supports connection to programming devices, operator panels, or the SINEC L1 LAN .

Technical Specifications and Hardware Details

This CPU features an integral hardware clock and a RUN/STOP switch for convenient operation. Its design includes switches for setting retentive memory and performing a complete reset . The following table details its key functional and electrical parameters.

Application in Legacy S5 Systems

Plant engineers use this CPU to maintain and support existing SIMATIC S5-based production lines. It is a critical component for system lifecycle management in industries like automotive and manufacturing . The Siemens 6ES5942-7UB11 enables continued operation of proven legacy equipment. Therefore, sourcing tested units is crucial for reliability in older automation infrastructure