Description
The HIMA F8652E is a Central Processing Unit (CPU) module for HIMA H41q safety-related automation systems. HIMA documentation identifies the F8652E as a central module for H41q systems, with support for safety-related applications and redundant processing architecture.
The module uses two clock-synchronized Intel 386EX 32-bit microprocessors, allowing the controller to perform safety-related processing with processor-level redundancy. Each processor has dedicated operating-system Flash-EPROM, user-program Flash-EPROM, and SRAM. The module also provides two RS-485 serial interfaces, a four-digit diagnostic display, and a fail-safe watchdog output.
Product Datasheet
| Item | Specification |
|---|---|
| Model | F8652E |
| Order Number | 984865264 |
| Brand | HIMA |
| Product Type | Central Processing Unit Module |
| System Family | H41q |
| Application | Safety-Related Control |
| Processor | 2 × Intel 386EX |
| Processor Architecture | 32-bit |
| Clock Frequency | 25 MHz |
| Operating System Memory | 1 MB Flash-EPROM per processor |
| User Program Memory | 512 KB Flash-EPROM per processor |
| Data Memory | 256 KB SRAM per processor |
| Communication Interfaces | 2 × RS-485 |
| Diagnostic Display | 4-digit alphanumeric display |
| Error Indicators | 2 × LEDs |
| Watchdog Output | Fail-safe, 24 VDC, up to 500 mA |
| Supply | 5 VDC |
| Current Consumption | Approx. 2 A |
| Module Width | 8 TE |
| Construction | Eurocard-style PCB assembly |
| Typical System | H41q-MS / H41q-HS / H41q-HRS |
The processor, memory, RS-485, diagnostic display, watchdog, 5 VDC supply, and 8 TE specifications are documented for the F8652/F8652E central-module family.
Typical Applications
- Safety Instrumented Systems (SIS)
- Emergency Shutdown (ESD)
- Process interlock systems
- Oil & gas facilities
- Chemical processing
- Power-generation control
- Turbine protection
- Legacy HIMA H41q installations
Installation & Use
- Verify the identification — Confirm F8652E / 984865264 and compare the hardware revision with the existing CPU.
- Check system compatibility — Verify that the target installation uses the H41q architecture.
- Power isolation — Remove system power according to the approved HIMA maintenance procedure before replacing the CPU.
- Inspect the backplane — Check the module connector, rack contacts, grounding, and adjacent boards.
- Check communication settings — The central module uses RS-485 interfaces; the bus station number and transmission rate should match the existing configuration.
- Check the backup battery — The F8652 family uses a battery-backed system; HIMA documentation recommends periodic battery replacement because battery life decreases significantly at elevated temperatures.
- Power-up diagnostics — Monitor the four-digit diagnostic display and error LEDs after startup.
- Safety validation — Verify CPU synchronization, communications, I/O status, alarms, watchdog operation, and application logic before returning the safety system to service.
Replacement Note
The F8652E belongs to an older HIMA H41q generation, so the complete part number and system configuration matter when sourcing a spare. HIMA approval documentation separately identifies F8652, F8652A, and F8652E as H41q central-module variants
