Key Features
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All-in-One Compact Design – Integrates CPU, 24V DC power supply, and I/O into a single 145 × 135 × 146 mm housing, reducing cabinet space and eliminating the need for a separate rack and backplane
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Dual AS511 Programming/Communication Interfaces – Two serial interfaces for simultaneous connection to a programmer (PG) and an operator panel/terminal (OP), enhancing system versatility
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Comprehensive Onboard I/O – 16 digital inputs (24V DC), 16 digital outputs (24V DC sourcing, 0.5A, short-circuit protected), 8 analog inputs (0–10V single-ended typical), and 1 analog output (0–10V / 0–20mA, switchable)
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8 K Statements Program Memory – STEP 5 program storage in internal RAM with approximately 2 µs binary operation execution time
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Battery-Backed RAM – 3.4V / 850mAh lithium backup battery retains the program and real-time clock during power loss, with a typical 5-year life at 25°C
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Interrupt and Counter Functions – 4 interrupt inputs and 2 counter inputs integrated into the 16 digital inputs
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Expansion Capability – Supports up to 448 digital I/O and 32 analog I/O via the IM315 expansion module (6ES5315-8MA11)
Technical Parameters
Core Advantages
1. Dual AS511 Interfaces for Flexible Connectivity
The -8MC01 variant stands out from other S5-95U models by providing two independent AS511 serial interfaces on the front panel . This allows simultaneous connection to a programming device (PG) for online monitoring and program modifications, and to an operator panel (OP) or terminal for HMI functionality — without needing to disconnect one to use the other. This dual-port capability makes the 6ES5095-8MC01 particularly valuable in applications requiring both programming access and operator interface on the same controller .
2. All-in-One Architecture for Compact Control
The S5-95U integrates the CPU, 24V DC power supply, and all onboard I/O into a single compact housing . This eliminates the need for a separate rack, power supply module, and I/O cards, significantly reducing cabinet space and simplifying installation. The turnkey design makes it ideal for OEM machinery, standalone control panels, and building services applications where panel space is at a premium .
3. Comprehensive Onboard I/O
The 6ES5095-8MC01 provides a versatile I/O mix directly on the CPU: 16 digital inputs (including 4 interrupt and 2 counter inputs), 16 digital outputs (0.5A sourcing, short-circuit protected), 8 analog inputs, and 1 analog output that can be switched between voltage (0–10V) and current (0–20mA) modes . This onboard capability handles many applications without requiring additional expansion modules.
4. Battery-Backed RAM for Program Integrity
The module incorporates a 3.4V / 850mAh lithium backup battery that retains the STEP 5 program in RAM when the 24V DC supply is interrupted . The battery has a typical service life of approximately 5 years at 25°C, with a yellow LED providing early warning of low battery condition. However, if the battery dies unnoticed and the power supply blips, the program can be lost — making battery maintenance and EPROM backup critical for reliable operation .
5. Proven Legacy Platform with Migration Path
The SIMATIC S5 series has a long track record of reliable operation in demanding industrial environments. For new installations or major redesigns, the closest modern equivalent is the S7-1200 (CPU 1214C for compact applications) or S7-1500 (CPU 1511 for higher performance) . However, STEP 5 programs do not auto-convert to STEP 7 — migration requires manual porting guided by Siemens migration documentation .
Applications
The 6ES5095-8MC01 is deployed across a range of industrial automation applications:
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What's Included
Why Buy From Us?
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In Stock – Ready to ship immediately
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New Original / Refurbished – Genuine Siemens factory condition or professionally refurbished
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Warranty Included – 12-month warranty for purchase confidence
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Fast Shipping – Expedited shipping options available
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Technical Support – Legacy system compatibility assistance available
Frequently Asked Questions (FAQ)
Q1: What is the Siemens 6ES5095-8MC01?
It is a compact central processing unit from the SIMATIC S5-95U series. It integrates the CPU, 24V DC power supply, and I/O into a single housing, featuring two AS511 serial interfaces for connecting a programming device and an operator terminal simultaneously .
Q2: What distinguishes the -8MC01 from other S5-95U variants?
The -8MC01 is the only S5-95U variant with two AS511 serial interfaces — one for a PG (programming device) and one for an OP (operator panel). Other variants offer a single programming port plus PROFIBUS (MB), PROFIBUS-DP slave (MD), or PROFIBUS-DP master (ME) functionality .
Q3: What I/O does this module provide?
It provides 16 digital inputs (24V DC, including 4 interrupt and 2 counter inputs), 16 digital outputs (24V DC sourcing, 0.5A, short-circuit protected), 8 analog inputs (0–10V single-ended typical), and 1 analog output (0–10V / 0–20mA, switchable) .
Q4: How much program memory does the 6ES5095-8MC01 have?
It has 8 K statements of internal RAM for STEP 5 programs, with a binary operation execution time of approximately 2 µs .
Q5: What happens if the backup battery fails?
The 3.4V / 850mAh lithium battery retains the program and real-time clock when 24V DC power is interrupted. If the battery dies and the power supply blips, the STEP 5 program in RAM will be lost. A yellow LED provides early warning of low battery condition — replace the battery promptly and maintain an EPROM backup of your program .
Q6: Can I replace a failed -8MC01 with a different S5-95U variant?
Not directly. The interface configurations are fixed at manufacture and cannot be field-upgraded. If your application uses the second AS511 port for an operator panel, you must replace with another -8MC01. Other variants (MA, MB, MD, ME) will not provide the dual AS511 functionality .
Q7: Is the SIMATIC S5 series still in production?
No. The SIMATIC S5 series has been discontinued by Siemens and replaced by the S7 series. The S5-95U is available only through third-party suppliers and remaining stock .
Q8: What is the modern replacement for the S5-95U?
The closest functional equivalent is the S7-1200 (CPU 1214C for compact applications) or S7-1500 (CPU 1511 for higher performance). Both are programmed in TIA Portal with STEP 7. STEP 5 programs do not auto-convert — migration requires manual porting .
Q9: What is the weight of this module?
Approximately 1.3 kg .
Q10: What should I verify before ordering?
Always verify the exact part number (6ES5095-8MC01), confirm your system requirements (dual AS511 ports for PG and OP), and check whether your application requires onboard analog I/O, counters, or expansion modules .
