HIMA F8621A

Description

Product Overview

HIMA F8621A is a dedicated auxiliary coprocessor expansion board designed for HIMA H41q and H51q programmable electronic safety systems (PES). It delivers independent high-speed serial communication processing and offloads data handling workload from the main central CPU, supporting external HMI, plant DCS interconnection, and field device serial protocol conversion without delaying core safety logic execution cycles. The module is fully integrated into the HIQuad redundant safety architecture for SIL3 rated safety loops.

Technical Specifications

• Dimension: 4 TE Eurocard width; physical size 100 mm × 80 mm × 32 mm
• Net Weight: 0.16 kg
• Operating Power Supply: 5 V DC, nominal operating current 360 mA
• Main Processor Chipset: HD64180 8-bit CISC industrial microcontroller, clock speed 10 MHz
• Onboard Static Memory: Total 384 KB combined CMOS RAM + EPROM storage
• RAM Backup Support: Battery-backed memory via matching F7131 monitoring module
• Serial Communication Interfaces: 2 × isolated half-duplex RS-485 ports
• Adjustable Baud Rate Range: 300 bps to 57600 bps software configurable
• Inter-CPU Interface: Dual-port RAM direct high-speed link to main HIQuad CPU Bus 1
• Isolation Rating for Serial Ports: 1500 V AC galvanic separation
• Operating Temperature Range: 0 °C to +60 °C
• Storage Temperature Range: -40 °C to +85 °C
• Safety Certification: IEC 61508 SIL 3, IEC 61511
• EMC Standard Compliance: EN 61000-6-2 industrial environment

Function Features

1. Independent serial communication coprocessor offloads main CPU non-safety data traffic
2. Dual isolated RS-485 channels support simultaneous connection to DCS systems and local safety HMIs
3. Software configurable serial baud rate, parity, stop bit, and protocol framing parameters
4. Onboard dual-port RAM enables zero-latency bidirectional data exchange with primary safety CPU
5. Continuous serial port line diagnostics detecting open circuit, short circuit, and signal attenuation
6. Non-volatile EPROM storage for permanent communication protocol configuration parameters
7. Front panel multi-color LED indicators for power, coprocessor active state, channel transmit/receive, and fault alarm

Performance Parameters

• Serial channel data processing throughput: Max 57600 bps per port simultaneous
• Inter-CPU dual-port RAM access latency: ≤ 0.8 μs
• Diagnostic coverage rate for serial communication faults: 99.2%
• MTTFd under rated operating conditions: > 1,850,000 hours
• Safety logic cycle delay introduced by coprocessor: < 1 ms maximum
• Continuous operation duty cycle: 100% 24/7 rated

Material Composition

• Main PCB: UL94-V0 FR4 flame retardant printed circuit board
• Front Panel: Black PA66 flame retardant industrial plastic with integrated LED light guides
• Communication Connectors: D-Sub 9 pin nickel-plated copper alloy connectors
• Internal Memory ICs: Industrial temperature grade CMOS RAM and UV-erasable EPROM chips
• Isolation Components: High-voltage optocoupler arrays with reinforced insulation
• Mounting Clips: Zinc-plated spring steel DIN rail lock hardware

Structural Characteristics

• Standard 4 TE vertical plug-in Eurocard form factor compatible with HIQuad H41q/H51q rack backplanes
• Rear side DIN 41612 96-pin backplane connector for power and inter-CPU bus connection
• Front panel equipped with D-Sub serial port outlets and dedicated LED status window
• Internal single-layer EMI shielding plate separating analog serial circuits and digital CPU bus circuits
• Mechanical anti-vibration locking tab to prevent module dislodging under plant vibration loads
• IP20 internal component cavity protection against cabinet dust accumulation

Working Principle

The main HIQuad safety CPU transfers non-safety communication data to F8621A via shared dual-port RAM. The onboard HD64180 coprocessor independently packages, encodes, and transmits data through isolated RS-485 channels, while receiving external serial data and formatting packets for the primary safety controller without occupying core safety logic computation resources. Integrated monitoring circuits continuously sample serial port signal integrity; any detected communication hardware fault triggers front panel fault LED and transmits fault diagnostic codes to the main CPU for safety system logging. All serial signal paths maintain full galvanic isolation to prevent external field circuit faults penetrating the safety CPU backplane.

Advantage Highlights

1. Coprocessor offloading eliminates safety logic cycle slowdown caused by heavy external serial communication traffic
2. Dual isolated RS-485 ports enable independent, interference-free connection to separate upper-level DCS and local HMI hardware
3. Wide software-configurable baud rate range compatible with legacy and modern industrial serial field devices
4. Compact 4 TE slot design preserves rack space for additional safety I/O modules
5. Battery-backed memory retains communication configuration parameters through full rack power loss events
6. Reinforced galvanic isolation blocks ground loop interference from remote field serial wiring

Applicable Industries

Legacy petrochemical safety control retrofits, thermal power plant HIQuad safety systems, natural gas pipeline interlock stations, refinery ESD control rooms, industrial boiler burner management systems, offshore platform safety monitoring cabinets

Installation Requirements

1. Mount exclusively on HIMA H41q / H51q standard 19-inch vertical Eurocard rack backplane slots
2. Pair with matching F7131 monitoring module to activate RAM backup power function
3. External rack 24 V DC power supply fitted with 6 A slow-blow T-type protective fuse
4. RS-485 field wiring must use shielded twisted pair cable with 120 Ω line termination resistor at cable far end
5. Maintain minimum 10 mm vertical ventilation gap between adjacent rack modules
6. Cabinet ambient humidity limited to 5% – 90% non-condensing, no corrosive gas exposure

Usage Precautions

1. Hot-swapping of F8621A is forbidden; fully disconnect rack primary power before insertion or removal
2. Do not connect RS-485 ports to AC mains voltage circuits; maximum field signal voltage limited to 24 V DC
3. Configure serial communication parameters exclusively via HIMA ELOP II factory programming software
4. Conduct monthly visual inspection of front panel fault LED indicators for hidden serial channel degradation
5. Store spare modules inside anti-static ESD shielding packaging at controlled 18–22 °C storage temperature
6. Operating temperature exceeding +60 °C causes permanent reduction of coprocessor service life