Description

HIMA H41q-HS B4237-1

1. Basic Information

Model: H41q-HS Main Rack Controller Unit | Order No.: B4237-1 | Part Code: 997104237

Product Profile: A SIL3 high-speed safety CPU rack assembly belonging to Germany HIMA HIQuad H41q series adopting 1oo2D safety redundant architecture. It serves as the core master base for SIS (Safety Instrumented System), ESD (Emergency Shutdown System) and BMS (Burner Management System) boiler combustion interlock systems. Integrated with dual CPUs, backplane bus and power supply slots, it acts as original OEM spare part for critical safety systems in chemical, petrochemical and thermal power industries.

Brand: HIMA | Origin: Germany

Compatible Equipment & Software: HIQuad H41q-HS safety control system, F8652X safety CPU module, F7130A power supply module, full range of H41q digital/analog safety I/O modules, Profibus DP/Ethernet communication modules, ELOPⅡ programming software; seamless interconnection with mainstream factory DCS systems including ABB, Honeywell and Yokogawa DCS.

Mounting Specification: Standard 19-inch DIN rack mounting; Overall dimensions: 222(H)×248(D)×185(W) mm, Net weight ≈3.6kg. Constructed with red all-metal aluminum extrusion housing and embedded backplane bus; PCB coated with full Grade G3 three-proof conformal coating, certified with CE and TÜV Rheinland approvals.

Standard Hardware Configuration: Rack equipped with dual CPU slots, dual redundant power supply slots, 8-channel local I/O backplane slots, high-speed safety I/O bus, front-panel LED diagnostic status indicators, passive dry-contact fault alarm terminals and dual-side front & rear wiring terminal blocks.

2. Technical Specifications

(1) Safety Architecture Parameters

Safety Certification: IEC61508 SIL3 and ISO13849 PL e certified by TÜV Rheinland; features 1oo2D dual-processor fault-tolerant redundant design. Two independent F8652X safety CPUs execute logic in parallel and cross-check calculated results in real time.

Scan Cycle: The HS high-speed variant features a minimum system cycle time of 1ms to fulfill millisecond-level tripping response for emergency interlocks, with a logic processing speed of 10 million instructions per second.

Redundancy Mechanism: Hardware diagnosis isolates a faulty single CPU within 5μs; the faulty channel goes offline while the standby channel takes over operation seamlessly to ensure non-stop system running.

(2) Electrical Power Specifications

System Power Input: Wide-range DC24V (18~32VDC); the rack supports redundant dual F7130A power supply input (N+1 power fault tolerance). Graded overcurrent fuse protection per individual module with built-in reverse connection, surge and Level 4 EMC lightning protection; total power consumption ≤38W.

Isolation Rating: Full galvanic isolation ≥2500VAC across safety I/O loops and communication circuits to eliminate ground loop interference between high-voltage field circuits and low-voltage control circuits.

(3) Bus & Communication Specifications

Backplane Bus: Dedicated HIQuad high-speed deterministic low-latency safety I/O backplane bus; one rack supports up to 8 local safety I/O modules, and remote sub-racks can be externally mounted to expand the system for a maximum of 32 safety I/O modules overall.

External Communication: Optional slot-mounted F8627X (Ethernet) / F8628X (Profibus-DP) modules supporting Profinet, Profibus-DP, Modbus TCP and RS485; safety communication protocols comply with IEC61158 standard for data exchange with upper-level DCS and SCADA platforms.

(4) Environmental Specifications

Operating Temperature: -20℃ ~ +65℃; Storage Temperature: -40℃ ~ +85℃

Humidity: 5%~95% RH non-condensing; compliant with IEC61000 Level 4 industrial EMC immunity to withstand electromagnetic interference from chemical dust, corrosive gas and high-power variable-frequency drive equipment.

H41q-HS B4237-1.jpg

3. Key Features

1oo2D Hardware Safety Redundancy for SIL3 Interlock Protection

Dual CPUs execute safety logic synchronously and compare operational outputs continuously. Any single CPU hardware failure triggers automatic isolation of the faulty unit while interlock output remains uninterrupted, delivering core hardware guarantee for ESD emergency shutdown and overpressure protection of process facilities.

High-Speed HS Scan for Ultra-Fast Safety Tripping

Minimum 1ms program cycle fits high-demand fast-response applications including unit ESD tripping, compressor interlock and machinery emergency stop, differentiating it from the standard low-speed H41q-MS variant.

Full-Loop Onboard Hardware Self-Diagnosis

Comprehensive power-up self-test covering CPU, power supply, backplane bus and all I/O slots; continuous real-time health monitoring during runtime. Fault alerts are issued via dual channels: front-panel LED indicators plus passive dry contacts, and fault messages are uploaded to DCS HMI via system bus.

Hot-Swap Module Replacement Without System Shutdown

CPU, power supply and I/O modules can be hot-plugged and replaced online without production halt, a critical advantage for continuous-process petrochemical plants.

Flexible Expansion & Multi-System Compatibility

8-slot local I/O plus remote extension architecture compatible with full-series HIMA safety I/O products; seamless interface with mainstream DCS brands, enabling drop-in replacement for legacy H41q system retrofit without cabinet rewiring.

4. Operating Principle

Dual redundant DC24V power feeds into the rack → F7130A power modules regulate and distribute power to dual CPUs and backplane bus.

Downstream Control: Safety logic downloaded via ELOPⅡ software → Synchronous computation by dual F8652X CPUs → Command transmitted over backplane I/O bus to safety DO modules → Drive field emergency shutdown valves and unit trip coils.

Upstream Data Collection: Field analog AI signals (pressure/temperature/liquid level) and discrete DI switch status → Acquired by safety I/O modules → Aggregated to dual CPUs via backplane → Logic evaluation triggers interlock shutdown upon process limit violation; meanwhile process data is uploaded to DCS through Profibus-DP or Ethernet.

Fault Handling Logic: Single CPU or power supply failure → Rapid hardware isolation of defective component; redundant equipment takes over standalone operation, and the rack’s alarm terminal outputs fault signals to upper monitoring system.

5. Application Scenarios

Petroleum Refining & Oil-Gas Industry: ESD emergency shutdown systems for refineries, long-distance oil/gas pipeline interlock and offshore platform safety control systems.
Fine & General Chemical Industry: SIS interlock for reactor overtemperature/overpressure protection and linked leakage cut-off systems for tank farm areas.
Thermal Power Generation: BMS boiler safety combustion system, steam turbine ESD protection and gas turbine interlock control.
Metallurgical Industry: Blast furnace safety interlock and rolling mill emergency stop protection systems.
Retrofit & Spare Parts: Drop-in upgrade replacement for legacy HIMA H41q-MS systems to HS high-speed version and overhaul spare parts for SIS projects of domestic and overseas process plants.