HIMA F8620/11 Central Processing Unit Module
The HIMA F8620/11, also cataloged as the F8620/11 Central Processing Unit Module, operates as a dedicated hardware component for executing safety logic routines and backplane data arbitration within PES H41q/H51q and HIMax 2000 controller platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | F8620/11 |
| Brand | HIMA |
| Origin | Germany |
| Weight | 0.45 kg |
| Dimensions | 172 x 110 x 41 mm |
| Operating Temp | -40 to +85 deg C |
| Power Consumption | 24 VDC supply voltage (Power consumption <= 50 W, current draw <= 2.1 A @ 24 VDC) |
| Architecture | 32-bit RISC processor, 1 GHz main frequency (1oo2D dual structure) |
| System Memory | 1 MB RAM, 1 MB Flash memory |
| System Capacity | Supports up to 1024 I/O points per CPU |
| Communication Ports | Ethernet, RS-232, Modbus RTU/ASCII, PROFIsafe |
| Electrical Isolation | 500 VDC |
| Functional Safety Rating | SIL3 (IEC 61508 / IEC 61511) |
| Ingress Protection | IP65 rated |
Triple Modular Redundancy (TMR) Architecture & Fail-Safe Execution
The HIMA F8620/11 leverages a dual 1oo2D internal architecture to execute real-time fault detection and guarantee deterministic fail-safe state execution across active safety loops. Built-in hardware watchdog circuits, bus monitoring logic, and memory fault detection algorithms continuously validate system integrity.
Operating across the HIBUS backplane, the unit provides 500 VDC electrical isolation to prevent external line surges from penetrating core logic circuits. The module executes cross-checking diagnostic routines between processor cores, allowing seamless fail-safe action or redundant channel fallback without introducing latency into field shutdown commands.
Frequently Asked Questions
Q: Does the HIMA F8620/11 CPU support hot-swapping during active control operations?
A: Yes. In redundant system configurations, technicians can remove and replace the processor module without shutting down power or interrupting active logic execution on the companion CPU module.
Q: What is the maximum initial inrush current drawn by the module during power-up?
A: The module draws an inrush current of less than 10 A for a duration under 1 ms when energized by a nominal 24 VDC supply.
Q: How does the internal architecture maintain SIL3 compliance under hardware faults?
A: The processor uses 1oo2D diagnostic cross-checking with internal hardware watchdogs, driving outputs directly to a defined fail-safe state if memory corruption or clock synchronization errors are detected.
Field Installation Guidelines
Install the CPU module directly into its designated rack slot on the backplane, ensuring the retention latches engage fully to secure mechanical alignment. Maintain a minimum vertical clearance of 50 mm above and below the chassis assembly to allow natural convection cooling across the -40 to +85 deg C operating temperature range.
Route 24 VDC main power leads and communication cabling in separate, shielded wire channels to isolate the processor from high-frequency electromagnetic interference. Connect the subrack grounding terminal directly to a central, low-impedance master ground earth point using a heavy-gauge wire strap. Verify bus connection tightness before energizing the system.
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