Siemens SIMATIC S5-95U 6ES5095-8MA03 Compact Controller Unit

Product Overview

The Siemens 6ES5095-8MA03 (6ES50958MA03) is a highly integrated, performance-optimized compact PLC from the legendary SIMATIC S5-95U range. Designed to provide a robust control solution where cabinet space is at a premium, this compact unit merges the CPU, power supply, and diverse I/O points into a single, reliable chassis. It is a cornerstone for legacy automation in industries such as textile manufacturing, food packaging, and local pump station control. By integrating high-speed counters and interrupt inputs directly into the base unit, the 6ES5095-8MA03 ensures high-precision process execution and significantly reduces the total cost of ownership by eliminating the need for multiple expansion modules.

Technical Configuration

The 6ES5095-8MA03 is engineered for "standalone" excellence while maintaining full integration capabilities within the S5 ecosystem.

• Integrated I/O Map: Features 16 digital inputs (including 2 interrupt-driven inputs) and 16 digital outputs, providing immediate connectivity for standard field devices.

• Specialized Functions: Includes two high-speed 2 kHz counters and two frequency meters, making it ideal for simple positioning and speed monitoring tasks.

• Analog Capability: Equipped with 8 analog inputs (8-bit) and 1 analog output, allowing for basic closed-loop control without additional hardware.

• Communication Interface: Standard 20mA (TTY) interface for direct connection to S5 programming units (PG) or OP-series Operator Panels.

• Memory Management: Supports external EPROM or RAM submodules for program security and non-volatile data storage during long-term power outages.

Technical Specifications

Technical FAQs

Can I expand the I/O of a 6ES5095-8MA03 if I run out of onboard points?

Yes. Although it is a compact unit, the S5-95U supports expansion via the S5-100U series bus units. You can add digital, analog, or functional modules to the right of the CPU to scale your system.

What is the primary difference between the 8MA03 and the PROFIBUS (8ME) versions?

The 8MA03 is the standard compact unit focused on localized control. It does not include the integrated PROFIBUS-DP Master port found in the 8ME models, though it can still communicate via the standard PG/L1 bus.

Does this unit require a backup battery?

Yes, to retain the RAM program and internal flags during power loss, a standard 3.6V Lithium battery is required. It is housed behind a small door on the front panel; always replace it while power is ON to prevent data loss.

Engineering & Installation Guide

• DIN Rail Mounting: The 6ES5095-8MA03 is designed for 35mm DIN rail mounting. Ensure the metal mounting clip at the back is securely engaged. In high-vibration environments, use end-brackets to prevent lateral movement that could loosen the 24V power connections.

• Thermal Clearances: To ensure the longevity of the internal electrolytic capacitors, maintain a minimum vertical clearance of 80mm above and below the unit. This facilitates natural convection cooling, which is vital for the 8MA03 when all digital outputs are fully loaded.

• Shielding Analog Signals: When utilizing the onboard 8-bit analog inputs, ensure the signal cables are shielded and the shield is clamped to the grounding rail as close to the unit as possible. This minimizes the risk of signal jitter caused by adjacent high-voltage AC wiring.