HIMA F 8620/11 H41q/H51q Series Central Processing Unit Module

Module Performance and Architecture

The F 8620/11 (Part Number F-8620/11) is the high-integrity computational core designed for HIMA H41q and H51q safety systems. As a central processing unit, it executes complex safety-instrumented functions (SIF) with a focus on deterministic logic solving. The module is engineered for SIL 3 safety environments, utilizing a 1oo2D internal diagnostic structure to ensure that all processing tasks are validated in real-time before output commands are committed to the field.

Detailed Hardware Specifications

• Model Identification: F 8620/11

• Part Number: F-8620/11

• Microprocessor: Dual 32-bit RISC safety processors

• Clock Frequency: 50 MHz

• Memory Capacity: 1 MB Flash EPROM / 1 MB SRAM

• Logic Execution Time: 0.05 ms per 1K instructions

• Backplane Supply Voltage: 5.0 VDC ± 5%

• Current Consumption: 1.2 A at 5 VDC

• Communication Interface: Integrated system bus for I/O and peer-to-peer links

• Diagnostics Display: Front-facing alphanumeric LED status array

• Safety Integrity Level: SIL 3 (IEC 61508) / AK 6 (DIN V 19250)

• Heat Dissipation: Max 6.0 W

• Operating Temperature: 0 to +60°C

• Storage Temperature: -40 to +85°C

• Physical Weight: 0.5 kg (1.10 lbs)

System Integration and Safety Logic

The F8620/11 handles the central arbitration of all safety data. It operates by cyclically scanning inputs, executing the user-defined logic, and updating outputs via the HIMA system bus. To ensure maximum reliability, the module performs continuous self-tests on its ALUs, registers, and memory sectors. In high-availability configurations, two F 8620/11 modules are utilized in parallel, allowing the system to tolerate a single hardware failure without tripping the process, provided the redundant partner is healthy.

Technical FAQ

What is the maximum program size supported by the F 8620/11?The module supports user programs up to 1 MB in size, which is sufficient for large-scale ESD or BMS applications involving several hundred I/O points.

How does the F 8620/11 handle memory errors?The CPU utilizes Error Correction Code (ECC) and parity checks. If a non-recoverable memory fault is detected, the F-8620/11 triggers a fail-safe shutdown of the CPU to prevent erratic logic execution.