Description
1. Unboxing & Physical Snapshot (Dynamic List)
- Model & Brand: Siemens 6ES5946-3UA23 (SIMATIC S5 CPU 946 Central Processing Unit for S5-155U)
ADEGIS
- Physical Dimensions: Approximately 280mm x 240mm x 50mm (W x H x D)
- Estimated Shipping Weight: 1.3 kg (boxed with molded static-dissipative foam cushioning)
- What’s in the Box: 1x 6ES5946-3UA23 CPU module sealed inside an original metal-out anti-static ESD shielding bag, mode selector key, backup battery compartment cover, and original OEM compliance documentation.
2. Product Introduction (Structure A: Environmental Hook)
Harsh industrial floors punish advanced computing electronics with continuous thermal stress, high-frequency backplane interference, and airborne corrosive particulate. Standard commercial microprocessors fracture quickly under these aggressive operating profiles, causing catastrophic facility trips and unannounced process shutdowns.
Built to endure punishing facility conditions, the Siemens 6ES5946-3UA23 maintains unyielding computational stability where less rugged hardware fails. (We frequently pull these high-end processing boards from heavy continuous-process control racks, and the conformal-coated multi-layer circuit traces remain entirely free of oxide bloom.) Proper thermal management keeps internal processing chips operating safely within design thresholds across large-scale S5-155U architectures.
3. Core Technical Specifications
| Parameter | Value |
|---|---|
| System Compatibility | SIMATIC S5-155U PLC automation infrastructure |
| Backplane Power Draw | Max 2.5 A at 5V DC supply |
| Power Dissipation | 12.8 W under full computational load |
| Memory Architecture | High-capacity integrated RAM with battery backup support (EPROM/EEPROM submodule compatible) |
| Processing Performance | High-speed execution for complex mathematical and logic loops |
| Communication Interfaces | Integrated AS511 programming port and multi-tier bus ports |
| Operating Temperature | 0°C to +55°C (natural convection cooling) |
| Storage Temperature | -40°C to +70°C |
| Mounting Standard | Dedicated CPU slot in SIMATIC S5 central subrack |
4. Global Compliance & Industry Certifications
Auditors demand verifiable documentation confirming that legacy system components comply with rigorous electrical safety mandates before plants resume operation.
- Expected Certifications: CE Mark, UL/cUL Listed (Industrial Control Equipment), CSA certification, and VDE conformity.
- Compliance Significance: UL listings verify that internal multi-layer board spacing and insulating materials prevent dielectric breakdown under transient surge conditions. (Class I Div 2 ratings ensure zero risk of spark ignition within classified hazardous plant sectors.) Verify specific lot certifications with OEM documentation before closing out compliance audits.
5. Long-Term Storage & Asset Preservation Guide
Warehouse storage destroys unprotected electronics if humidity and electrostatic hazards go unmanaged. Keep this asset safe:
- Store the CPU module sealed tightly inside its original metal-out anti-static (ESD) shielding bag to block atmospheric moisture and static discharge from damaging sensitive microchips.
- Maintain warehouse relative humidity strictly below 60% to prevent micro-corrosion on the high-density gold-plated backplane connector pins.
- Disconnect or remove the backup lithium battery if prolonged storage exceeds twelve months to prevent electrolyte leakage from damaging circuit traces.
6. Physical Installation Prerequisites
Proper mechanical placement guarantees longevity and prevents localized overheating inside the heavy-duty cabinet enclosure.
- Convection Clearance: Leave at least 60mm of open space above and below the CPU chassis to permit proper vertical airflow across heat-dissipating components.
- Grounding Protocol: Bond the integrated module shielding frame directly to the subrack grounding busbar using star lock washers to suppress electromagnetic interference (EMI).
7. Buyer’s FAQ (Logistics & Compliance Focus)
Q: Which Harmonized System (HS) code applies to international customs clearance for the 6ES5946-3UA23? A: This central processing unit typically clears under HS code 8537.10 or 8538.90, but importers should confirm final classification with their broker according to local destination rules.
Q: Does this surplus unit come with pre-loaded system firmware? A: New surplus hardware ships with standard factory system firmware burned onto onboard ROM; engineering teams must download the compiled S5 user program file using STEP 5 programming software prior to deployment.
Q: How does the declared Country of Origin (COO) influence international shipping paperwork? A: The COO—typically Germany for this heritage manufacturing line—governs preferential duty rates under international trade agreements, making a verified certificate of origin essential for seamless customs processing.
