Siemens 6ES5943-7UB11 CPU | S5 Central Processing Unit

Why This CPU Powers Your SIMATIC S5 System

This central processing unit handles logic execution for medium to large applications. You get a powerful Siemens 6ES5943-7UB11 for SIMATIC S5 programmable controllers. It supports up to 32k words of user program memory. Therefore, your system can manage complex automation tasks without performance issues.

Technical Specifications and Physical Details

The Siemens 6ES5943-7UB11 features a built-in EPROM submodule for program storage. It includes one serial interface for programming and diagnostics. This CPU fits into a standard S5 rack slot. Its dimensions measure approximately 250 mm in width and 25 mm in height. The unit weighs around 0.65 kg for straightforward installation. This processor stores its program in battery-backed RAM during operation. Consequently, your logic remains safe for several months without external power.

Below is the detailed breakdown of the hardware specifications.

Parameter	Specification
Product Model	6ES5943-7UB11
Product Type	Central Processing Unit
Brand	Siemens
Family	SIMATIC S5
Program Memory	32k words (max)
Storage Type	Battery-backed RAM + EPROM submodule
Communication Port	1 x serial (TTY / RS-232)
Slot Requirement	1 S5 rack slot
Dimensions (W x H)	Approx. 250 x 25 mm
Approx. Weight	0.65 kg
Power Source	Backplane connection
Energy Storage	Battery-backed RAM
Component Count	Single integrated board

Installation and Programming Notes

This CPU slides into any standard S5 rack slot. You must align the card guides properly before insertion. The Siemens 6ES5943-7UB11 accepts STEP 5 programming language. Therefore, existing S5 logic transfers quickly without major changes. Always replace the backup battery every two years. A weak battery will cause complete program loss during a power failure.