Siemens 6ES7960-1AA00-0XA0 – High-Availability Synchronization Module | SIMATIC S7-400H Platform
Engineering Background: The SIMATIC S7-400H is Siemens’ flagship fault-tolerant PLC platform, engineered for process industries where unplanned downtime carries catastrophic operational and financial consequences. The 6ES7960-1AA00-0XA0 is the dedicated synchronization module that forms the backbone of the H-system’s redundancy architecture — it maintains bumpless switchover between the active and standby CPUs by continuously mirroring process images, I/O states, and program data across a fiber-optic synchronization bus.
Product Positioning: Designed for procurement engineers and system integrators sourcing replacement or expansion components for existing S7-400H installations. This module is a direct OEM part, fully compatible with the S7-400H redundancy framework, and is supplied with traceability documentation upon request. Konmask.com maintains verified stock to support both planned maintenance windows and emergency replacement scenarios.
Complete Technical Specifications
- Part Number: 6ES7960-1AA00-0XA0
- MLFB (Order Number): 6ES7 960-1AA00-0XA0
- Product Family: SIMATIC S7-400H
- Module Type: Synchronization Module (Sync Module)
- Synchronization Interface: Fiber-optic (2 × fiber-optic connectors)
- Max. Synchronization Cable Length: Up to 10 m (standard); extended configurations available with appropriate fiber
- Redundancy Mode: Hot-standby (1-of-2 redundancy)
- Switchover Time: < 1 cycle time (bumpless)
- Compatible CPUs: S7-400H CPUs (e.g., 6ES7414-4HM14-0AB0, 6ES7416-5HS06-0AB0)
- Mounting: Plugs directly into H-CPU module slot
- Operating Voltage: Supplied via CPU backplane (no external power required)
- Operating Temperature: 0 °C to +60 °C
- Storage Temperature: −40 °C to +70 °C
- Relative Humidity: 10% to 95% (non-condensing)
- Degree of Protection: IP20
- Dimensions (W × H × D): Refer to Siemens SIMATIC S7-400H System Manual
- Weight: Approx. 60 g
- Certifications: CE, UL, cULus, ATEX (zone 2), IECEx
- Country of Origin: Germany
Proven Application Environments
- Oil & Gas: Pipeline SCADA, compressor control, wellhead automation — where process continuity is non-negotiable
- Chemical & Petrochemical: Reactor control, distillation column management, safety-critical batch processes
- Power Generation: Turbine control, substation automation, grid-tie protection systems
- Water & Wastewater: Pumping station control, treatment plant automation requiring 24/7 uptime
- Pharmaceutical: GMP-compliant manufacturing lines, validated redundant control architectures
- Automotive & Heavy Industry: Press lines, transfer systems, and assembly automation with zero-tolerance for unscheduled stops
Engineering Advantages
- Bumpless Switchover: CPU failover occurs within one PLC scan cycle — field devices see no interruption, no output glitch, no process upset
- Fiber-Optic Isolation: Galvanic isolation between redundant CPUs eliminates common-mode failure paths from electrical noise or ground faults
- Plug-and-Play Replacement: Module replacement does not require CPU reprogramming; the standby CPU re-synchronizes automatically after module insertion
- Deterministic Sync Latency: Fixed synchronization cycle ensures predictable redundancy behavior across all load conditions
- Compact Form Factor: Integrates directly into the CPU module — no additional rack space or wiring required
- Long Service Life: Designed for 10+ year operational lifecycles consistent with Siemens SIMATIC platform longevity commitments
System Architecture & Signal Flow
In an S7-400H system, two identical CPUs operate in parallel — one active (master), one standby. The 6ES7960-1AA00-0XA0 synchronization modules (one per CPU) are interconnected via fiber-optic cables. At each PLC scan cycle, the active CPU transmits its complete process image and program state to the standby CPU through this sync link. The standby CPU mirrors the active state in real time. Upon detection of a fault in the active CPU (hardware failure, watchdog timeout, or power loss), the standby CPU assumes control within the current scan cycle. The transition is transparent to the field I/O and the SCADA/DCS layer above.
Sourcing & Quality Verification
- Origin: Sourced from authorized Siemens distribution channels and verified OEM supply chains
- Inspection: Each unit undergoes visual inspection, label verification (MLFB, date code, firmware revision), and functional pre-shipment checks
- Documentation: Certificate of conformity, packing list, and optional third-party inspection reports available on request
- Packaging: ESD-safe anti-static packaging with moisture barrier; original Siemens carton where available
- Warranty: 12-month Konmask warranty covering manufacturing defects; Siemens OEM warranty terms apply where applicable
Procurement Process
- Confirm Compatibility: Verify your S7-400H CPU model and existing sync module revision before ordering — contact our engineering team if uncertain
- Request Quote: Submit your RFQ via support@konmask.com or WhatsApp +0086 19859288691 for volume pricing and lead time confirmation
- Order Placement: Purchase directly via this product page or via PO for B2B accounts
- Shipping: DHL Express / FedEx International Priority standard; freight forwarding and consolidation available for large orders
- After-Sales: Technical support available post-delivery for installation verification and system commissioning queries
Technical FAQ
Q: Is the 6ES7960-1AA00-0XA0 compatible with all S7-400H CPU versions?
A: It is compatible with the standard S7-400H CPU range. Always cross-reference the CPU firmware version and system manual (A5E00068271) to confirm compatibility with your specific CPU revision.
Q: Can I replace a single sync module without shutting down the system?
A: Yes — in a healthy H-system, the standby CPU can be taken offline, its sync module replaced, and the CPU reinserted for re-synchronization without interrupting the active process. Follow Siemens hot-swap procedures in the S7-400H system manual.
Q: What fiber-optic cable specification is required?
A: The module uses Siemens SIMATIC fiber-optic cables (e.g., 6XV1820-5BH20 for 2 m, or equivalent). Multimode 62.5/125 µm fiber with BFOC/2.5 (ST-compatible) connectors is required. Do not use single-mode fiber.
Q: Does Konmask provide installation support?
A: Yes. Our engineering team can provide remote commissioning guidance, wiring diagrams, and configuration checklists. Contact support@konmask.com.
Q: What is the lead time for this part?
A: In-stock units ship within 1–3 business days. For out-of-stock scenarios, typical lead time is 2–4 weeks. Contact us for real-time availability.
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Contact: support@konmask.com | +0086 19859288691
