Siemens 6ES5928-3UB12 – High-Performance CPU Processor Module | SIMATIC S5-928B Platform
Engineering Background
The Siemens 6ES5928-3UB12 is a central processing unit (CPU) module designed for the SIMATIC S5-928B programmable logic controller platform — one of Siemens’ most robust and widely deployed industrial automation architectures. Engineered for demanding process control environments, this CPU delivers deterministic scan-cycle execution, high-capacity program memory, and seamless integration within the S5 bus backplane ecosystem.
Product Positioning
Targeted at procurement engineers and maintenance teams managing legacy SIMATIC S5 installations, the 6ES5928-3UB12 is the authoritative replacement and upgrade CPU for S5-928B systems. Konmask.com sources verified OEM units to ensure full hardware and firmware compatibility with existing S5 infrastructure — eliminating costly system re-engineering.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 6ES5928-3UB12 |
| Product Family | SIMATIC S5 Series |
| Platform / System | SIMATIC S5-928B PLC |
| Module Type | Central Processing Unit (CPU) |
| Manufacturer | Siemens AG |
| Country of Origin | Germany |
| Program Memory | Up to 256 KB (expandable via memory submodule) |
| Data Memory | Integrated RAM with battery-backed retention |
| Processing Speed | High-speed binary instruction execution |
| Communication Interface | SINEC H1 / L2 compatible; multiprocessor capable |
| Bus Interface | SIMATIC S5 backplane bus |
| Operating Voltage | 24 V DC (via backplane) |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +70 °C |
| Relative Humidity | 5% to 95% (non-condensing) |
| Protection Class | IP20 |
| Dimensions (W×H×D) | Standard S5 single-slot module form factor |
| Weight (approx.) | 1.2 kg |
| Certifications | CE, UL, cUL |
| Programming Language | STEP 5 (STL, LAD, CSF) |
| Software Tool | STEP 5 / S5 for Windows |
Proven Application Environments
- Continuous Process Industries: Chemical plants, oil & gas refineries, and water treatment facilities requiring 24/7 deterministic control loops.
- Discrete Manufacturing: Automotive assembly lines, press control, and robotic cell coordination within legacy S5 architectures.
- Power Generation & Utilities: Turbine governor control, substation automation, and grid-tied SCADA integration.
- Material Handling: Conveyor systems, sorting lines, and warehouse automation with high I/O point counts.
- Building Automation: HVAC, fire suppression, and access control systems in industrial facilities.
Engineering Advantages
- Deterministic Scan Cycle: Guaranteed cycle-time consistency critical for closed-loop process control and safety interlocks.
- Multiprocessor Architecture: Supports multi-CPU configurations within a single S5-928B rack for parallel processing and load distribution.
- Battery-Backed Memory Retention: Program and data memory preserved through power interruptions — essential for continuous process environments.
- SINEC Network Integration: Native SINEC H1 and L2 support enables seamless integration into existing Siemens industrial Ethernet and fieldbus networks.
- Proven Long-Term Reliability: Designed to IEC 61131 industrial standards with a field-proven MTBF exceeding 100,000 hours in controlled environments.
- Drop-In Replacement Compatibility: Direct hardware replacement for existing S5-928B CPU slots — no rack modification or rewiring required.
System Architecture & Signal Flow
The 6ES5928-3UB12 occupies the CPU slot of the SIMATIC S5-928B central controller rack. It communicates with I/O modules via the S5 parallel backplane bus, executing the STEP 5 user program in a cyclic scan. The CPU reads process image inputs (PII) at the start of each scan, executes logic, and writes process image outputs (PIO) at scan completion. Memory submodules (EEPROMs or RAMs) plug directly into the CPU’s onboard submodule socket for program storage expansion. The integrated SINEC interface allows the CPU to act as a network master or slave node within a multi-tier SIMATIC network topology.
Sourcing & Quality Verification
- OEM-Verified Stock: All 6ES5928-3UB12 units sourced by Konmask.com are verified against Siemens OEM part markings, date codes, and hardware revision labels.
- Functional Testing: Each unit undergoes power-on self-test (POST) verification and basic I/O bus communication checks prior to dispatch.
- Anti-Counterfeit Inspection: PCB markings, component date codes, and enclosure laser engravings are cross-referenced against known-good reference units.
- Condition Grades Available: New-in-box (NIB), factory-refurbished (FR), and tested-used (TU) — clearly labeled on each order.
- Traceability Documentation: Certificate of conformity and inspection report available upon request for regulated industries.
Procurement Process
- Submit RFQ: Contact [email protected] or call +0086 19859288691 with your required quantity, condition grade, and delivery timeline.
- Quotation & Lead Time: Receive a formal quotation within 24 business hours including unit price, shipping cost, and estimated lead time.
- Order Confirmation: Confirm purchase order via email or through the Konmask.com checkout. Proforma invoice issued for wire transfer or credit card payment.
- Quality Inspection & Dispatch: Unit inspected, photographed, and securely packaged in anti-static ESD shielding with foam cushioning.
- Shipping & Tracking: Dispatched via DHL Express, FedEx, or UPS with full tracking. Export documentation (commercial invoice, packing list, COO) included.
- After-Sales Support: 90-day warranty on all tested units. Technical support available for installation and commissioning queries.
Technical FAQ
Q: Is the 6ES5928-3UB12 compatible with STEP 7 programming software?
A: No. The S5-928B platform uses STEP 5 programming software. STEP 7 is designed for the SIMATIC S7 series. Siemens provides migration tools (S5/S7 converter) if you are planning a platform upgrade.
Q: Can this CPU be used in a multiprocessor configuration?
A: Yes. The 6ES5928-3UB12 supports multiprocessor operation within the S5-928B rack, allowing up to 4 CPUs to share I/O and coordinate tasks via the backplane bus.
Q: What memory submodules are compatible?
A: The CPU accepts standard SIMATIC S5 memory submodules including 6ES5375-series EEPROMs and RAMs. Consult the S5-928B system manual (6ES5998-3UB12) for the full compatibility matrix.
Q: Is a backup battery required?
A: Yes. A 3.6 V lithium backup battery (Siemens 6ES5980-0MA11 or equivalent) is required to retain RAM program data and real-time clock during power loss.
Q: What is the typical lead time for in-stock units?
A: In-stock units typically ship within 1–3 business days. Lead time for sourced units is 5–15 business days depending on availability. Contact us for current stock status.
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Contact: [email protected] | +0086 19859288691
