Technical Overview
The HIMA F8621A functions as a dedicated coprocessor and serial communication interface for legacy H41q and H51q HI-Quad safety racks . This module offloads serial protocol handling from the main safety CPU. Consequently, it preserves deterministic execution of critical safety logic. The unit operates within a 1oo2D fault-tolerant architecture. Furthermore, it performs continuous self-diagnostics and reports hardware faults via front-panel LEDs .
Key Specifications
The HIMA F8621A relies on an HD64180 processor running at 10 MHz. It includes 384 KB of combined CMOS-RAM and EPROM. Moreover, RAM data retention depends on the companion F7131 power-monitor module. Two galvanically-isolated RS-485 half-duplex ports handle field communications. Additionally, baud rates range from 300 to 57,600 bps and remain configurable via software . The module draws 5 VDC from the rack backplane with a nominal 360 mA consumption .
| Parameter | Value |
|---|---|
| Processor | HD64180 @ 10 MHz |
| Memory | 384 KB CMOS-RAM / EPROM |
| Interfaces | 2 × RS-485 half-duplex, isolated |
| Baud Rate | 300–57,600 bps |
| Supply | 5 VDC, 360 mA |
| Form Factor | Eurocard, 4 TE |
| Weight | 0.58 kg |
| Operating Temp | -20 °C to +60 °C |
| Safety Rating | SIL 3 (IEC 61508) |
Functional Role
The HIMA F8621A enables data exchange with DCS, SCADA, and intelligent field devices. It supports Modbus-RTU and HIMA internal protocols. A dual-port RAM provides fast access to the main CPU bus . Therefore, the module maintains efficient backplane communication. It requires the HIMap engineering tool for configuration. Notably, hot-swap operation is not supported .
Details
| Weight | 0.16 kg |
|---|---|
| Dimensions | 70 × 70 × 50 mm |
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