HIMA H51q-H High-Integrity Safety Controller (B5233-2 / 997235233)

The HIMA H51q-H (type designation B5233-2, order number 997235233) is a compact yet powerful safety controller from the HIMatrix family. It integrates a fail-safe CPU, a range of onboard I/O channels, and multiple communication interfaces into a single, space-saving housing. Certified for use in applications up to SIL 3 (IEC 61508) and PL e (ISO 13849-1), the H51q-H is ideal for medium-scale safety instrumented systems where a modular rack-based solution may be overkill. Its rugged design and flexible configuration make it suitable for both process safety and machine safety applications.

Key Features

• All-in-One Design: Combines CPU, I/O, and communication ports in one compact unit, reducing panel space and wiring complexity.

• SIL3 / PL e Certified: Meets the highest safety integrity levels for both process and machinery applications.

• Integrated I/O: Typically includes 24 digital inputs, 16 digital outputs, 4 analog inputs, and 2 analog outputs (exact configuration may vary by variant).

• Multiple Communication Options: Built-in Ethernet (Modbus TCP, PROFINET), serial (Modbus RTU), and CANopen; supports safety-related communication via safe Ethernet protocols.

• Flexible Programming: Programmed using HIMA's SILworX with certified function blocks for valves, motors, sensors, and logic.

• Wide Operating Temperature: -20°C to +70°C, suitable for harsh environments.

Technical Specifications

• Power Supply: 24 VDC ±20%

• Digital Inputs: 24 (24 VDC, type 3 compliant)

• Digital Outputs: 16 (24 VDC, 0.5 A each, short-circuit protected)

• Analog Inputs: 4 (4–20 mA / 0–10 V, 12-bit)

• Analog Outputs: 2 (4–20 mA, 12-bit)

• Communication: 2× Ethernet (100Base-TX), 1× RS-485 (Modbus RTU), 1× CAN

• Safety Integrity: SIL 3 (IEC 61508), PL e (ISO 13849-1), Category 4 (EN 954-1)

• Cycle Time: ≥ 10 ms (depending on program size)

• Operating Temperature: -20°C to +70°C

• Certifications: TÜV, CE, UL, ATEX (Zone 2)

Applications

The H51q-H is used in a wide range of industries, including chemical, pharmaceutical, oil and gas, power, and manufacturing. Typical safety functions include emergency shutdown, fire and gas detection, burner control, high-integrity pressure protection, and machine safety interlocks. Its compact form factor makes it especially suitable for skid-mounted systems, remote terminal units (RTUs), and small-to-medium process units where space and cost are constrained.

Integration and Programming

Configuration and programming are performed with HIMA's SILworX software, which provides a comprehensive engineering environment compliant with IEC 61131-3. The tool includes pre-certified safety function blocks and supports online simulation, monitoring, and debugging. The H51q-H can communicate with higher-level control systems (DCS/SCADA) via Modbus TCP or PROFINET, while safety-related data exchange with other HIMA controllers uses safe Ethernet protocols.

Reliability and Diagnostics

The H51q-H features extensive onboard diagnostics, including processor self-tests, memory checks, I/O monitoring, and communication integrity verification. Any detected fault forces outputs to a safe state and alerts the operator. The unit is designed for high availability, with mean time between failures (MTBF) exceeding 100,000 hours. Its rugged enclosure meets IP20 protection for control cabinet installation.

With its integrated I/O, small footprint, and full safety certification, the HIMA H51q-H (B5233-2 / 997235233) offers a cost-effective and reliable solution for demanding safety applications.