Technical Specifications
| Parameter | Value |
|---|---|
| Product Model | 6ES5095-8MC03 |
| Manufacturer | Siemens AG |
| Product Type | SIMATIC S5-95U Compact Unit (Integrated CPU + I/O Bus) |
| Product Family | SIMATIC S5 (S5-90U / S5-95U Series) |
| Interface | 2nd AS511 Programming/Communication Port (S5 proprietary) |
| Programming Language | STEP 5 (STL / LAD / CSF) |
| I/O Expansion | Up to 32 S5-100U-series I/O modules |
| Operating Voltage | 24 V DC |
| Power Consumption | Version-dependent (typical S5-95U class) |
| Mounting Method | 35 mm DIN Rail |
| Protection Rating | IP20 (indoor cabinet) |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -25°C to +70°C |
| Dimensions (W×H×D) | 151 × 154 × 159 mm (15.50 × 15.90 × 15.20 cm packaged) |
| Weight | 1.272 kg |
| Communication Protocol | AS511 (Siemens S5 programming/diagnostic protocol) |
| Compliance | CE, EU EMC Directive; Non-RoHS (legacy class) |
| EAN / UPC | EAN 4025515063346 / UPC 662643261615 |
| Commodity Code | 85371091 |
| Lifecycle Status | Discontinued since 01-Oct-2020, “Deleted without replacement” |
| Country of Origin | Germany |
Main Features and Advantages
Second AS511 interface for parallel engineering and monitoring: The defining advantage of the 6ES5095-8MC03 over the base S5-95U is its dual AS511 ports. AS511 is Siemens’ classic point-to-point protocol for STEP 5 programming devices, operator panels, and early SCADA gateways. With two ports, the 6ES5095-8MC03 lets an engineer keep a PG laptop permanently connected for live diagnostics while simultaneously linking an HMI or telemetry gateway—eliminating the disruptive “unplug-replug” cycle during commissioning and troubleshooting. This convenience translates directly into reduced mean-time-to-repair (MTTR) on the factory floor.
All-in-one compact architecture: Unlike modular S5-115U or S5-135U controllers that require a dedicated rack, power supply, and separate CPU card, the 6ES5095-8MC03 consolidates the processor, memory, and I/O bus driver into a single 1.272 kg block that snaps onto a standard 35 mm DIN rail. This space-saving design makes the 6ES5095-8MC03 ideal for small control cabinets, machine-side junction boxes, and retrofit projects where panel real estate is at a premium. Despite its compact footprint, it retains the ability to address up to 32 I/O modules—sufficient for the vast majority of discrete manufacturing and skid-mounted process applications.
Proven SIMATIC S5 reliability: The 6ES5095-8MC03 inherits the legendary durability of the SIMATIC S5 platform, which has been the workhorse of European and global industrial automation since the late 1970s. Engineered for 24 V DC operation, 0–60°C ambient, and IP20 cabinet environments, the 6ES5095-8MC03 delivers deterministic scan-cycle execution of STEP 5 code with exceptional resistance to electrical noise, vibration, and temperature cycling. Many units in the field have logged 20+ years of continuous duty—a testament to the build quality that modern PLCs struggle to match.
Seamless legacy system compatibility: Because the 6ES5095-8MC03 uses the identical STEP 5 instruction set, AS511 protocol, and S5-100U I/O bus as its S5-95U siblings, it drops directly into existing programs and hardware topologies without code migration. Plants that standardized on S5-95U decades ago can swap in a 6ES5095-8MC03 as a hot standby or permanent replacement, preserving thousands of lines of validated ladder logic and avoiding the six-figure cost of a full DCS/PLC platform modernization.
Availability as a professionally refurbished MRO spare: Although Siemens has discontinued the 6ES5095-8MC03, specialized automation surplus suppliers now offer fully overhauled, bench-tested units with warranties of 12 to 24 months—comparable to new-equipment assurance. Every refurbished 6ES5095-8MC03 undergoes component-level inspection, capacitor reforming where needed, firmware/EPROM verification, and loop-back testing before shipment, ensuring the unit performs identically to the original Siemens factory build.
