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Overview

The HIMA F8650E Central Module is designed for safety-related applications in Process Automation Systems (PES), including H51q-MS, HS, and HRS. It meets rigorous functional safety standards from SIL 1 to SIL 3 and AK 1 to AK 6, ensuring reliable operation in safety-critical environments. Its robust architecture combines real-time processing with comprehensive diagnostics and fault-handling capabilities.

Key Features

• Safety certification: SIL 1–3, AK 1–6
• Microprocessor: Intel 386EX, 32-bit, 25 MHz
• Memory: 1 MB Flash-EPROM, 1 MB SRAM
• Onboard diagnostics: Four-digit matrix display, error LEDs, toggle switches, push-button ACK
• Event handling: Up to 2048 events, 500 events stored in buffer
• Backup battery: 100-day lifetime at 60°C, recommended replacement every 2 years
• RS-485 communication interfaces with galvanic isolation
• Safety-related watchdog with 24 VDC output and short-circuit protection

Technical Specifications

Processor & Memory

• Microprocessor: Intel 386EX, 32-bit
• Clock: 25 MHz
• Flash-EPROM: 1 MB
• SRAM: 1 MB (OS-dependent efficiency)
• Operating System: Custom PES OS supporting user programs and data

Interfaces & Diagnostics

• Two RS-485 interfaces with galvanic isolation
• Four-digit matrix display for system diagnostics
• Two LEDs for CPU and I/O error status
• Toggle switches and push-button for error reset (ACK function)

Event Handling

• Up to 2048 programmable events
• 500 events stored in event buffer

Power & Environmental

• Operating Voltage: 5 V, 2 A
• Backup Battery: 100-day lifetime at 60°C
• Recommended battery: CR 2477N, HIMA 44 0000018

Physical & Mechanical

• Construction: Two European standard PCBs (central module + diagnostic display)
• Space Requirements: 8 TE
• Cooling: Modification needed when upgrading from F8650 to F8650E

RS-485 Pin Allocation

• Pin 2: RP (5 V, decoupled)
• Pin 3: A/A’ (RxD/TxD-A)
• Pin 4: CNTR-A (Control signal A)
• Pin 5: C/C’ (DGND)
• Pin 6: VP (5 V, positive supply)
• Pin 8: B/B’ (RxD/TxD-B)
• Pin 9: CNTR-B (Control signal B)

Switch Settings

• S1-8: Transmission rate (9600 bps ON, 57600 bps OFF)
• S1-1/2/3/4/5: Bus station number

Applications

• Safety-critical process automation in PES systems
• Functional safety control in H51q-MS, HS, HRS installations
• High-reliability industrial automation requiring SIL/AK certification
• Event-driven monitoring and fault-tolerant system design

Details