PLCs, Power Supplies & Others

The Siemens 6ES5946-3UA22 serves as a central processing unit for SIMATIC S5 systems. This module executes user logic and manages all I/O operations efficiently. You will find this processor in factory automation and process control applications. It handles discrete and analog control tasks with ease.

Manufacturer: Siemens
Series: SIMATIC S5
Category: CPU Module (Central Processing Unit)

Physical Dimensions and Weight

The Siemens 6ES5946-3UA22 measures 12.0 inches in length. Its width reaches 2.0 inches for dual-slot occupancy. The board thickness sits at 5.5 inches including components. This standard form factor fits into any S5 series rack. The total weight comes to approximately 0.8 kilograms.

Technical Specifications and Processing Power

This CPU module uses a 16-bit microcontroller architecture. It operates at a clock speed of 10 MHz. The module stores user programs in 64KB of battery-backed RAM. Additionally, it holds 32KB of EPROM for firmware storage. The typical scan time reaches 2 milliseconds per 1,000 instructions.

Energy Storage and Data Retention

The Siemens 6ES5946-3UA22 includes a replaceable lithium battery for RAM backup. This battery provides 6 months of data retention without external power. A supercapacitor array adds 72 hours of temporary backup during battery changes. Therefore, you can replace the battery without losing your program. The module also stores critical parameters in non-volatile EEPROM.

Interface and Connectivity

This CPU module features a built-in programming port using RS-232 protocol. A separate RS-485 port supports communication with remote I/O racks. The front panel includes an 8-position mode selector switch. Five LED indicators show RUN, STOP, and fault status clearly. You can connect a programming terminal through the 15-pin D-sub connector.

Component Layout and Memory Map

The Siemens 6ES5946-3UA22 contains 140 discrete components on a six-layer PCB. Key parts include the main CPU chip and 20 memory ICs. The memory map divides into four distinct regions. Program blocks occupy 32KB of the address space. Data blocks use another 16KB, and flags use 8KB. The remaining 8KB serves system functions and diagnostics.

Integration and Compatibility

Use the Siemens 6ES5946-3UA22 with any S5 series I/O rack. It works alongside 6ES5942-3UA22 or 6ES5944-3UA22 CPU modules. This processor supports all standard S5 programming software packages. For similar industrial control solutions, explore the RMS-TSG-TZ-C Static Trip device [link removed per instruction]. Order this original Siemens CPU to maintain your legacy S5 system’s operation.

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