HIMA X-DO2401 Digital Output Module (985210203)

The HIMA X-DO2401 (order number 985210203) is a high-density fail-safe digital output module designed for the HIMax safety system. It provides 24 independent output channels, each capable of switching 24 VDC loads up to 0.5 A, such as solenoids, relays, indicator lights, and small actuators. The module is certified for SIL 3 applications and includes comprehensive protection features including short-circuit and overload protection on each channel, as well as line monitoring for open-load detection. Its robust design ensures safe and reliable control of field devices in emergency shutdown, fire & gas, and other critical safety functions.

Key Features

• 24 Fail-Safe Outputs: High channel density for controlling multiple actuators in a single module.

• SIL3 Certified: Suitable for the highest safety integrity levels per IEC 61508.

• Per-Channel Protection: Short-circuit and overload protection with automatic shutdown and recovery.

• Line Monitoring: Open-load detection (requires external load or pull-up) to verify wiring integrity.

• Galvanic Isolation: Outputs grouped with isolation to prevent fault propagation.

• Fast Switching: Typical output delay ≤ 5 ms.

• Hot-Swappable: Can be replaced while the system is running (in redundant configurations).

Technical Specifications

• Number of Outputs: 24 (in groups of 8, isolated between groups)

• Output Voltage: 24 VDC nominal (supply from field power)

• Output Current: 0.5 A per channel, 4 A per group, 8 A total

• Protection: Short-circuit (auto-shutdown), overload, overtemperature

• ON Voltage Drop: ≤ 0.5 V at rated current

• OFF Leakage Current: ≤ 0.5 mA

• Response Time: ≤ 5 ms (typical)

• Isolation: 500 VAC between groups and backplane

• Power Consumption: 300 mA from 5 V backplane + load current from field supply

• Operating Temperature: -20°C to +60°C

• Certifications: TÜV (SIL3), CE, UL, ATEX (Zone 2)

Applications

The X-DO2401 is used in process safety applications to drive actuators such as solenoid valves (for shutdown), alarm horns, beacon lights, and motor starters. It is ideal for emergency shutdown (ESD), fire and gas (F&G), and burner management (BMS) systems where reliable de-energization or energization of field devices is critical. Its high channel count reduces the number of modules needed, saving rack space and simplifying wiring.

Integration and Configuration

The module plugs into any I/O slot of a HIMax chassis and is automatically recognized by the safety CPU. Using HIMA's SILworX software, engineers configure each output's behavior, including line monitoring parameters and fail-safe states (de-energized or last state) upon communication loss. Diagnostic data, including channel faults and short-circuit events, is reported to the CPU for alarm handling and maintenance alerts.

Reliability and Environmental Compliance

Designed for continuous industrial use, the X-DO2401 meets IEC 61000-4 immunity standards and is tested for vibration and shock. It operates reliably in temperatures from -20°C to 60°C and is protected against transient overvoltages. The module is RoHS compliant and carries TÜV, CE, and UL certifications, ensuring global acceptance.

With its robust output drivers, comprehensive diagnostics, and SIL 3 capability, the HIMA X-DO2401 (985210203) digital output module delivers safe and reliable control of field actuators in the most demanding safety instrumented systems.