Description
1. At-A-Glance Executive Brief
- Model: F8621A (Part No. 984862160)
- Brand: HIMA
- Part Type: Coprocessor / Communication Module (HIQuad H51q Series)
- Lifecycle Status: Mature / Discontinued
- System Compatibility: HIMA H51q Safety Instrumented Systems (PES)
- Core Protocol: Dual RS-485 Half-Duplex Interfaces
2. Technical Introduction
Managing internal data traffic and offloading communication tasks inside legacy safety-critical processor racks is essential for maintaining deterministic processing speeds during continuous plant operation. The HIMA F8621A is a specialized coprocessor and communication module engineered for deployment within HIQuad H51q programmable electronic systems. Powered by an independent HD 64180 microprocessor running at 10 MHz, the unit features dedicated dual-port RAM for high-speed memory access alongside static memory storage. It handles peripheral data exchange and system communications via galvanically isolated RS-485 interfaces, preventing bottlenecks on the main safety CPU.
Engineer’s Takeaway: Integrating a verified F8621A replacement card into your H51q rack restores proper communication handshakes and processing bandwidth, resolving systemic rack communication lags without requiring a controller redesign.
3. Core Technical Specifications
| Parameter | Value |
| Manufacturer | HIMA (Paul Hima GmbH) |
| Product Family | HIQuad H51q System Series |
| Module Type | Coprocessor / Communication Module |
| Microprocessor | HD 64180 (10 MHz clock frequency) |
| Memory Configuration | 384 KB static memory (CMOS-RAM and EPROM combination) |
| Communication Interfaces | 2 x galvanically isolated RS-485 (half-duplex) |
| Rack Space Requirement | 4 TE standard industrial module width |
| Module Weight | Approx. 0.16 kg |
4. Field Engineer’s Tech Notes
- Onboard Battery Backup and RAM Integrity: The internal CMOS-RAM relies on an onboard backup power source to preserve stored parameters and volatile configurations during power-down cycles. Always check the battery voltage status prior to commissioning a surplus or long-term stored F8621A module to prevent configuration loss upon system startup.
- RS-485 Bus Polarization and Biasing: When attaching external serial communication lines to the half-duplex RS-485 ports, verify that proper line polarization resistors and termination schemes are active on the trunk. Unbalanced line reflections in high-noise industrial environments will cause frame error accumulation and drop communication links between the coprocessor and external nodes.
5. Adaptive QA & Testing Protocol
Before dispatch, this F8621A module is mounted on an active H51q test backplane to verify dual-port RAM read/write cycles and internal microprocessor execution stability. Technicians validate communication data packet transmission across both isolated RS-485 serial ports under simulated load conditions. Watchdog timer responses and power-up diagnostic routines are checked to confirm hardware integrity. Complete test logs and verification recordings are available upon request prior to shipment.
6. Buyer’s FAQ
- What warranty is provided with this hardware?
All New Surplus and fully tested refurbished HIMA processor modules include a standard 12-month operational warranty from the date of purchase.
- Is this part supplied as New Surplus or Refurbished?
Stock availability fluctuates between factory-sealed New Surplus (NSFP) and fully bench-tested refurbished inventory. Contact our sales department to verify current stock condition.
- What is the typical shipping lead time for urgent plant needs?
Stocked items ship same-day from our primary distribution center, ensuring rapid transit to minimize downtime during critical maintenance turnarounds.
