SIEMENS SIMATIC S5 6ES5090-8MA01

SIEMENS SIMATIC S5 6ES5090-8MA01 – Central Processor Unit CPU 90 for S5-90U PLC

The Siemens SIMATIC S5 6ES5090-8MA01 is a compact central processing unit (CPU 90) designed for the SIMATIC S5-90U programmable logic controller system. This unit serves as the core controller in small-scale automation applications, particularly in distributed and space-constrained installations where reliability and basic control functionality are required.

The CPU 90 integrates the processor, memory, and input/output handling in a single unit. It is engineered for direct mounting and simple integration into low to mid-range automation solutions. The module is equipped with a basic range of internal functions and supports essential control tasks, including sequential logic, basic arithmetic operations, and real-time processing.

The unit features a built-in 20 mA current loop interface (TTY) used for programming and diagnostics via a programming device or operator panel. It supports programming with STEP 5 software, using standard Siemens programming languages such as STL (Statement List), LAD (Ladder Diagram), and FBD (Function Block Diagram).

Technical specifications:

• Model: 6ES5090-8MA01

• CPU type: CPU 90

• PLC system: SIMATIC S5-90U

• Memory: Integrated RAM for user programs

• Power supply: 24V DC

• Communication: 1 x TTY (20 mA current loop)

• Integrated I/O: No built-in I/O, expandable with additional modules

• Programming software: STEP 5

• Mounting: Direct panel or rail mounting

• Dimensions: Compact form factor suitable for limited space applications

• Weight: Approx. 0.5 kg

This CPU is suitable for basic automation tasks in industrial environments such as machine control, small production lines, and auxiliary process systems. It allows for modular expansion through additional S5-90U I/O modules and provides a solid base for systems where cost-efficiency and minimal complexity are key requirements.

Although discontinued, this CPU remains a dependable component in legacy systems where continuity of control and integration into existing architectures is necessary. It is often retained in facilities that continue to operate SIMATIC S5-based infrastructure and require reliable spare parts for ongoing maintenance.

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