Description
Core Product Summary
The HIMA F8621A (often designated in the F86xx series as an F8621x family variant) is a coprocessor and communication module designed for integration within HIMA H51q safety-related programmable electronic systems (PES). It functions as an auxiliary processing unit that offloads communication and specific data handling tasks from the main central processing unit.
Engineers specify the F8621A to expand system communication channels and streamline multi-module data exchange in safety instrumented systems. The module integrates dual RS-485 half-duplex interfaces with galvanic isolation, an internal 10 MHz microprocessor, and dual-port RAM for high-speed memory access. It installs directly into designated system slots, operating on internal rack power supplies while supporting configurable data transmission rates via software or central unit DIP switches.
Key Technical Specifications
| Parameter | Specification |
| Product Type | Coprocessor / Communication Module |
| System Compatibility | HIMA H51q Safety System (PES) |
| Microprocessor | HD 64180 (10 MHz clock frequency) |
| Memory Configuration | 384 KB static memory (CMOS-RAM and EPROM) |
| Memory Architecture | Dual-Port RAM for fast data exchange with the central module |
| Communication Interfaces | 2 \times RS-485 (half-duplex) with galvanic isolation |
| Transmission Rates | Software-selectable: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600 bps (or via CU DIP switch) |
| Operating Voltage | 5 V DC |
| Typical Current Consumption | 360 mA |
Detailed Product Overview
The HIMA F8621A acts as an intelligent coprocessor module engineered to optimize processing performance within H51q safety instrumented architectures. By hosting an independent 10 MHz HD 64180 microprocessor and dedicated communication controllers, the module manages serial data traffic and internal task scheduling without burdening the primary safety processor.
Data exchange between the F8621A and the primary central module occurs via high-speed dual-port RAM, ensuring rapid updating of control variables. The inclusion of two galvanically isolated RS-485 half-duplex interfaces allows the system to establish reliable serial links with external supervisory networks, HMI terminals, or peripheral safety nodes. RAM contents are protected against power interruptions via system-level battery backup mechanisms managed through the rack’s power supply monitoring modules.
F8621A
F8621A
System Compatibility & Integration Requirements
| Item / Dependency | Verified Compatibility or Requirement | Practical Note |
| System Family | HIMA H51q Programmable Electronic System (PES) | Designed to slot directly into standard H51q chassis backplanes. |
| Power Supply | 5 V DC rack power (approx. 360 mA draw) | Verified low-power draw allows integration within existing system power budgets. |
| Memory Backing | Power Supply Monitoring Module (e.g., F7131 series) | Provides battery buffering for the module’s static CMOS-RAM. |
| Interface Configuration | RS-485 hardware switches (S1–S4) | Specific switch combinations must be matched to activate designated interface channels. |
Dimensions, Mounting & Connection Notes
- Form Factor: Standard HIMA rack-mount module format designed for industrial control sub-racks.
- Dimensions: Compact modular footprint (approx. 2 cm \times 18.7 cm \times 12.8 cm).
- Weight: Approximately 0.16 kg to 0.6 kg depending on configuration packaging.
- Wiring & Isolation: Galvanic isolation on RS-485 ports protects against ground loops and common-mode industrial noise.
- Environmental Placement: Requires installation within a clean, dry, climate-controlled industrial cabinet with sufficient clearance for convective cooling.
FAQ
What is the HIMA F8621A?
The HIMA F8621A is a coprocessor and communication module built to enhance data processing and serial communication capabilities within HIMA safety systems.
Which controller family is compatible with the F8621A?
It is engineered specifically for deployment within the HIMA H51q safety-related programmable electronic system (PES) family.
What are the main processing characteristics of the module?
It utilizes an internal 10 MHz HD 64180 microprocessor paired with 384 KB of static memory (CMOS-RAM and EPROM) and dual-port RAM for fast memory access.
What communication interfaces does the F8621A provide?
It features two galvanically isolated RS-485 half-duplex serial interfaces supported by dedicated communication processors.
How are transmission rates configured on the module?
Transmission rates can be configured either via software across 9 selectable baud rates (ranging from 300 to 57600 bps) or by inheriting preset values from the central unit (CU) DIP switches.
Documented Performance Data
Performance metrics are limited to the verified hardware parameters: a 10 MHz processor clock speed, dual-port RAM memory access speeds, and selectable RS-485 baud rates up to 57,600 bps. No synthetic or unverified benchmark metrics are published.
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