F8621A (HIMA Secure Communication Coprocessor Module) Basic Information

Model: F8621A (often written as F8621/A)

Brand: HIMA (German HIMA)

Type: H41q/H51q System Safety Communication Coprocessor (to share the communication load of the main CPU)

Safety level: IEC 61508 SIL3, TÜV Certification

Part number: 984862160

Installation: Rack slot type (occupies 1 slot)

Protection level: IP20

Weight: Approximately 0.18kg

Electrical parameters

Power supply: 5VDC (backplane), 24VDC dual power supply

Power consumption: Typical 7W (5V backplane power supply)

Insulation withstand voltage: Input / communication interface to ground 500V AC / 1 minute

Built-in protection: Overvoltage, undervoltage, reverse connection, overtemperature, short circuit protection

Hardware performance

Processor: 400MHz PowerPC (independent communication core)

Memory: 32MB SDRAM, 8MB Flash (firmware / configuration)

Backplane bus: 1Gbit/s fault-tolerant safety bus (dual-port RAM interaction)

Architecture: Coordinated with the main CPU (F8650X/F8652X), TMR triple redundancy

Periodic load: Can offload the communication load of the main CPU up to 70%

Communication interface

Ethernet: 1× RJ45 10/100Base-TX (Modbus TCP, OPC, SNMP, NTP)

Serial port: 2× isolated RS-485 (PROFIBUS DP-V1 master / slave station, up to 126 slave stations per port)

System bus: HIMA dedicated redundant safety backplane bus

Supported protocols: PROFIBUS DP-V0/V1, Modbus RTU master / slave, Modbus TCP, ELOP II/SILworX diagnosis

Environmental parameters

Operating temperature: -20℃ ~ +60℃

Storage temperature: -40℃ ~ +85℃

Relative humidity: 5%~95%, no condensation

Vibration / shock: Compliant with IEC 60068 industrial standard

MTBF: >1,100,000 hours Core function

Communication Offloading: Independently process fieldbus/ethernet data, reducing the load on the main CPU

Redundant Communication: Dual RS-485 + Ethernet multi-link redundancy, automatic failover in case of failure

Real-time Diagnosis: Full self-diagnosis of hardware/links, fault reporting does not affect safety interlock

Hot Swap: Supports online replacement, automatically synchronizes configuration after replacement

Protocol Conversion: Achieve data intercommunication between SIS and DCS/PLC/HMI

Panel Indicator Lights

PWR Green: Power normal, constantly on

RUN Green: Operation normal, flashing

ALM Red: Hardware/communication failure alarm

ETH Yellow: Ethernet data transmission and reception flashing

COM Yellow: RS-485 / backplane bus communication flashing

Installation and Maintenance

The rack slot is pushed in and locked to ensure reliable backplane contacts

Connect power, Ethernet / serial port in accordance with specifications, and the cabinet is reliably grounded

Check the status of indicator lights during daily inspections, regularly tighten terminals, and clean dust

Replace with the same model directly, no need to reconfigure programs and addresses