Product Short Description

Product Introduction

HIMA F8650E is the entry-grade safety central processing unit core for HIMA HIMax H51q-MS safety programmable electronic systems (PES). It executes user-defined safety logic programs, coordinates backplane I/O module communication, processes continuous safety diagnostics, and delivers safety shutdown actuation commands for critical industrial safety loops. It implements dual redundant 1oo2D fault-tolerant architecture to satisfy IEC 61508 SIL3 functional safety requirements.
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HIMA F8650E
HIMA F8650E - Image 2

Description

Technical Specifications

  • Main Processor: Dual synchronized Intel 386EX 32-bit microprocessors, 25 MHz clock frequency
  • Memory Configuration:

    OS Flash EPROM: 512 KB

    User Program Flash EPROM: 1 MB

    Runtime SRAM Data Memory: 512 KB

  • Power Supply Input: 24 V DC ±10 %
  • Typical Power Consumption: 12 W
  • Communication Interfaces: 2 galvanically isolated RS485 serial ports, internal HIMax SyncBus backplane bus
  • Supported Communication Protocols: Modbus RTU, HIMA SafeCom internal safety bus
  • Safety Scan Cycle Range: 10 ms – 1000 ms user-configurable
  • Physical Dimensions: 187 mm × 128 mm × 41 mm
  • Module Weight: 0.34 kg
  • Protection Rating: IP20 (cabinet internal installation only)
  • Operating Temperature Range: -20 °C ~ +60 °C
  • Storage Temperature Range: -40 °C ~ +85 °C
  • Humidity: 5 % – 95 % RH non-condensing
  • Certifications: TÜV SIL3, IEC 61511, ATEX, CE, UL

Function Features

  1. Dual synchronous CPU voting architecture; divergent calculation results trigger safety fail-safe state
  2. Hardware watchdog timer independent of both CPUs for complete processor fault detection
  3. Full backplane I/O module hot-swap support during online system operation
  4. Comprehensive event timestamp logging for safety incident sequence-of-event analysis
  5. Built-in over-temperature protection with graded alarm and safety trip thresholds
  6. Redundant communication path automatic switchover upon RS485 port failure
  7. Full self-test execution during every power-up cycle and periodic background runtime test

Performance Parameters

  • Maximum executable safety logic program size: 9600 logic network blocks
  • Maximum addressable I/O module quantity per CPU rack: 32 HIMax I/O modules
  • Serial communication baud rate range: 300 bps – 115200 bps
  • Maximum bus data transmission latency: 5 ms
  • PFDH Safety Index: ≤ 10⁻⁷ SIL3 rated

Material Composition

  • Front panel: UL94-V0 flame retardant ABS plastic with printed safety status legend
  • Main PCB: Double-sided FR4 fiberglass board with full G3 anti-corrosion conformal coating
  • Backplane connector: Gold-plated beryllium copper multi-pin contact assembly
  • Chassis frame: Galvanized cold rolled steel anti-vibration support frame

Structure Characteristics

  • Horizontal plug-in rack-mounted module design with locking ejector levers
  • Front panel integrated multi-color LED array for power, CPU fault, communication, safety trip status
  • Separate isolated power and signal circuit partitions on PCB layout
  • Internal passive finned aluminum heat sink for CPU heat dissipation

Working Principle

Two identical 32-bit CPUs receive identical backplane I/O input data simultaneously and execute identical safety logic algorithms independently. All output calculation results are cross-compared via dedicated inter-processor safety bus. If all calculation values match, safety actuation commands are transmitted to output I/O modules; persistent mismatch initiates controlled fail-safe shutdown of all safety outputs. Independent watchdog circuit monitors CPU clock activity; loss of clock signal forces immediate safety trip state regardless of CPU operation.

Advantage Highlights

  1. Cost-optimized entry SIL3 CPU for small-to-medium safety systems (≤32 I/O modules)
  2. Deterministic fixed safety scan cycle eliminates unpredictable logic latency
  3. Integrated event logging removes external data recorder hardware requirement
  4. Full backward compatibility with all HIMax F-series I/O modules
  5. Continuous background diagnostics reduce mandatory offline proof-test frequency
  6. Compact rack footprint minimizes safety cabinet dimension requirements

Applicable Industries

Small-scale power plant auxiliary safety systems, medium chemical batch reactors, local fire & gas detection panels, marine vessel machinery safety shutdown, water treatment plant emergency interlocks

Installation Requirements

  1. Install exclusively on HIMax H51q-MS dedicated redundant backplane rack
  2. Reserve minimum 15 mm vertical air gap between adjacent CPU/I/O modules
  3. 24 V DC power source must supply dual redundant feed lines with independent circuit breakers
  4. RS485 field communication cables require 120 Ω termination resistor at bus end node
  5. Cabinet ambient temperature must not exceed 60 °C maximum continuous operating limit

Usage Notes

  1. Only HIMA certified programming software (SafeCAD) permitted for logic program download
  2. Module replacement requires complete safety loop re-calibration and proof-test
  3. Do not operate without all rack blank filler panels installed to maintain airflow cooling
  4. All program modifications require formal safety management change control documentation
  5. Avoid mounting adjacent to high-power resistive heating equipment inside control cabinet

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