Product Overview

The HIMA F8650E is a high-integrity Central Module designed for use within the H41q and H51q safety-related automation systems. This module acts as the primary processing core, managing safety logic execution and system diagnostics to protect critical industrial processes. Engineered with a 1-out-of-2 (1oo2) internal architecture, it utilizes dual clock-synchronized microprocessors to perform continuous self-tests and cross-checks. This design ensures that the system meets the stringent requirements of SIL 3 (Safety Integrity Level 3), providing a fail-safe environment for emergency shutdown (ESD) and fire and gas (F&G) applications. The integrated 4-digit alphanumeric display provides immediate hardware status and error codes, facilitating rapid on-site troubleshooting.

Hardware Parameters and Key Technical Characteristics

The F8650E is characterized by its deterministic processing and robust memory management, tailored for safety-critical execution.

• Manufacturer HIMA Paul Hildebrandt GmbH

• Model Designation F8650E (Part Number 98 4865064)

• Processing Architecture Dual-processor system using Intel 386EX CPUs

• Clock Frequency 25 MHz (Synchronized)

• Safety Certification SIL 3 compliant according to IEC 61508

• System Memory 1 MB Flash-EPROM for OS; 512 KB Flash-EPROM for user logic; 256 KB SRAM for data storage

• Watchdog Protection Safety-related watchdog with 24 V output (500 mA load capacity)

• Serial Connectivity Two electrically isolated RS-485 interfaces

• Operating Voltage 24 VDC nominal (Internal data processing at 5 VDC / 2000 mA)

• Physical Profile 4.1 cm x 18.7 cm x 12.8 cm

• Weight 0.34 kg

• Environmental Tolerance -20°C to +60°C operating range; 95% non-condensing humidity

Industrial Applications and Operational Use Cases

This central module is a fundamental component for safety instrumented systems (SIS) across hazardous industrial sectors.

• Emergency Shutdown (ESD) Systems Monitoring critical process variables in oil and gas refineries to initiate safe shutdown sequences during overpressure or thermal excursions.

• Fire and Gas (F&G) Detection Acting as the central logic solver for plant-wide flame and toxic gas detection networks, triggering suppression systems and alarms.

• Burner Management Systems (BMS) Overseeing the safe start-up, operation, and shutdown of industrial boilers and furnaces to prevent fuel-related explosions.

• Chemical Process Safety Managing high-risk chemical reactions where the loss of control could lead to environmental release or equipment failure.

• Redundant Control Configurations Operating within a dual or multi-processor rack to ensure that safety functions remain available even during a single-path hardware fault.

The HIMA F8650E ensures that safety functions are executed with the highest degree of reliability, minimizing the risk of both dangerous failures and nuisance trips in high-stakes production environments.