Product Short Description
Product Overview
SIL 3 certified digital output module used to drive field safety actuators including solenoid valves, safety trip relays and alarm horn devices. It provides 24 isolated 24 V DC output channels with dual fault monitoring circuits to ensure fail-safe cut-off upon any module hardware failure.
Description
Technical Specifications
- Output Channel Count: 24 isolated digital output channels
- Output Signal Type: 24 V DC transistor sinking output
- Single Channel Rated Load Current: 0.5 A
- Channel Galvanic Isolation: 2000 V AC isolation voltage
- Signal Response Time: < 1 ms
- Safety Level: IEC 61508 SIL 3
- Power Supply: 24 V DC (-15% ~ +20%)
- Dimension: 100 mm × 60 mm × 20 mm, weight 0.1 kg
- Operating Temperature: -20 ℃ ~ +60 ℃; storage -40 ℃ ~ +85 ℃
- Channel Diagnosis: Load open circuit, short circuit and overload overcurrent detection
Core Functional Features
- 24 independent isolated output channels for multi-point safety actuator control
- Real-time monitoring of each output load state; automatically cut off output upon overload or short circuit
- Fail-safe design: All channels cut off output power when module loses power or detects internal fault
- Hot-swappable structure for online replacement without system full stop
- Built-in overcurrent and freewheeling protection for inductive solenoid valve loads
- Front panel LED status indicators for channel output enable and channel fault alarm
Working Principle
After receiving safety trip logic commands from X-CPU 01 via backplane XBus, the module’s safety drive chip controls the conduction of each channel’s power transistor to output 24 V DC voltage to field solenoid valves or relays. Each output channel integrates current sampling circuit; if load current exceeds 0.6 A (overload) or approaches zero (wire breakage), fault signal is fed back to the main CPU and the corresponding channel output is immediately shut down. When internal module hardware failure or backplane communication loss occurs, all output transistors are forced to cut off to realize safety fail state. Freewheeling diodes inside each channel absorb reverse electromotive force generated by inductive actuators to protect drive circuits.
Structural & Material Characteristics
- Outer shell: Thin aluminum alloy heat dissipation shell
- Drive circuit: High-power MOSFET per channel with independent heat sink pad
- Wiring terminals: Screw terminals supporting 0.75–2.5 mm² copper cables
Installation Requirements
- Installed on HIMax system baseplate I/O slots
- All field output cables must use shielded twisted pair wire, shield single-point grounding
- Inductive loads (solenoid valves) must install external freewheeling diodes at the field terminal end as secondary protection
- Maintain heat dissipation gap between modules to avoid thermal accumulation triggering overcurrent protection
Application Scenarios
ESD emergency shutdown solenoid valve drive, boiler fuel cut-off valve control, fire protection alarm horn output, turbine trip relay drive, chemical reactor safety isolation valve control.
Operation & Maintenance Precautions
- Strictly prohibit connecting AC loads directly to DC output channels
- Do not parallel multiple solenoid valves on a single channel to avoid exceeding 0.5 A current limit
- When replacing field actuators, set the corresponding channel to forced OFF state via SILworX software before live disconnection
- Inspect channel terminal current load every quarter to prevent long-term overload aging of drive transistors
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