HIMA H41Q-B4237-2 Redundant Safety Controller Module

System Architecture and Performance

The H41q-B4237-2 is a high-availability redundant controller designed for safety-critical process automation. Built on the proven H41q platform, this module set ensures continuous operation by utilizing dual-processor architecture where each unit operates with independent power regulation. It is specifically engineered for SIL 3 (IEC 61508) applications, providing a robust logic solver for emergency shutdown (ESD) and burner management systems (BMS).

Key Technical Specifications

• Model Designation: H41q-B4237-2

• Redundancy Level: Dual-channel central module configuration for maximum uptime

• Processor Memory: Up to 16 MB of integrated RAM for complex safety logic execution

• Supply Voltage Inputs: Dual 24 VDC / 5 VDC dedicated power rails per CPU

• Network Connectivity: Integrated Ethernet interface for peer-to-peer and DCS communication

• Expansion Capacity: Support for up to 13 I/O modules via the system backplane

• Communication Slots: Two dedicated slots for specialized communication protocols

• Thermal Management: Support for up to four integrated fan units for high-density installations

• Chassis Dimensions: Standard 19-inch rack mount, 5 HU height profile

• Unit Mass: Approximately 1.5 kg

• Operating Ambient Range: -20°C to +60°C (standard industrial conditions)

• Storage Temperature Range: -40°C to +85°C

Functional Engineering Overview

The B 4237-2 utilizes a 1oo2D (1-out-of-2 with diagnostics) architecture to provide fault tolerance without compromising safety integrity. The integrated 16 MB RAM allows for large-scale user programs and extensive diagnostic buffers. By isolating the 24V/5V power conversion at the module level, the H41q-B4237-2 prevents single-point power failures from affecting the entire safety loop. The high-speed Ethernet port supports modern industrial protocols, facilitating seamless data exchange with plant-wide supervisory systems.

Technical FAQ

How does the redundancy switchover affect process timing?The H41q-B4237-2 features high-speed synchronization between the dual central modules. In the event of a primary processor fault, the secondary module assumes control within one scan cycle, ensuring no interruption to the safety function.

Can this module be used in harsh outdoor environments?While the B 4237-2 is rated for -20°C to +60°C, it should be installed in a NEMA 4 or IP65 rated enclosure if exposed to moisture or corrosive atmospheres to maintain its safety certifications.