Product Short Description
Product Name: HIMA F8650 Safety Central Processing Unit (CPU) Module
Product Overview: The HIMA F8650 is a safety-rated central processor module designed for HIMA HIMax and HIQuad X (H51q-MS / -HS / -HRS) Safety Instrumented Systems (SIS). It serves as the core logic solver for executing emergency shutdown (ESD), burner management (BMS), and fire & gas (F&G) safety functions.
Description
Technical Specifications:
- Processor: 2 × Intel 386EX 32-bit microprocessors, clock-synchronized at 25 MHz
- Memory: 1 MB Flash-EPROM (OS) + 1 MB Flash-EPROM (user program) + 1 MB SRAM per processor
- Communication: 2 × electrically isolated RS485 interfaces (Modbus RTU)
- Safety Watchdog: 24 V DC output, max 500 mA, short-circuit protected
- Supply Voltage: 5 V DC via backplane (typical 2 A, < 10 W)
- Safety Integrity Level: SIL 3 (IEC 61508), PL e / Cat.4 (ISO 13849-1)
- Diagnostics: 4-digit alphanumeric display + LED status indicators + ACK reset button
- Backup Battery: CR2032 (protects RAM, recommended replacement every 2 years)
Functional Features: Implements a 1oo2D dual-CPU lock-step redundant architecture within a single module; two F8650 modules form a 2oo4D Quadruple Modular Redundant (QMR) central unit. Continuous cross-comparison and self-diagnostics enable automatic fault isolation while maintaining SIL 3 operation.
Operating Principle: Both microprocessors execute safety logic in synchronous lock-step. Any discrepancy between the two processors triggers an immediate fail-safe transition, driving outputs to a predefined safe state and raising an alarm without interrupting plant operations.
Application Scenarios: Offshore platform ESD and HIPPS; reactor safety interlock in petrochemical plants; turbine overspeed protection and boiler safety control (BCS) in power generation; vacuum monitoring in pharmaceutical freeze-drying; signaling system safety interlock in rail transit.
Structural & Environmental Characteristics:
- Module width: 8 SU (European standard PCB, approx. 100 × 80 × 40 mm)
- Weight: approx. 0.3 – 0.5 kg
- Operating temperature: -20 °C to +60 °C (wide-temp version -40 °C to +85 °C)
- Storage temperature: -40 °C to +85 °C
- Humidity: 5 % – 95 % non-condensing
- Protection class: IP20
Installation Requirements: Mount in dedicated CPU slots of the HIMax chassis / 19-inch rack (8 SU slot). Ensure correct redundant pairing — never mix different CPU revisions (e.g., F8650E with F8650X) in a redundant pair.
Usage Notes: Always verify that the redundant counterpart module is the exact same revision. Firmware versions must be matched across the redundant pair. Hot-swapping is supported for online replacement. The backup battery should be replaced preventively every 2 years to avoid loss of protected RAM data.
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