Description
Technical Specifications
- Product Model: STO1726KO1
- Brand: ALSTOM
- Warranty: One Year
- Input Voltage: 24 VDC ±10%
- Operating Temperature: -40°C to +70°C
- Storage Temperature: -40°C to +85°C
- Response Time: ≤10 ms safety response (emergency shutdown)
- Protection Class: IP20 (control cabinet installation)
- Accuracy Class: High-reliability safety signal processing
- Output Frequency: Real-time control signal switching
- Rated Current Range: Up to 10 A output capability (depending on configuration)
- Communication Interface: Industrial fieldbus integration (e.g., PROFIBUS or safety networks depending on system configuration)
- Supported Protocols: Industrial safety standards including IEC 61508 / EN 50129 compatible systems
- Overload Capacity: Integrated overload and fault protection for drive safety circuits
- Dimensions: Approx. 90 × 45 × 80 mm (typical industrial module size)
Product Overview
The STO1726KO1 is a functional safety module designed for use in industrial drive systems and rail-grade automation platforms. Manufactured by ALSTOM, this module implements the Safety Torque Off (STO) function, which immediately removes torque from electric motors when a safety event occurs, preventing uncontrolled motion and protecting both personnel and equipment.
In high-risk environments—such as traction systems, automated production lines, or heavy machinery—the ability to quickly disable motor torque is essential for emergency stop chains and safety interlocks. The module performs this task by isolating the drive’s power stage and interrupting the torque-producing signals within milliseconds after a safety trigger is detected.
The design incorporates dual-channel safety architecture, electrical isolation between control and power circuits, and continuous diagnostic monitoring. These features allow the module to meet stringent functional safety standards while maintaining stable operation under vibration, electromagnetic interference, and wide temperature ranges typical in industrial and railway environments.
Because of its fast response, reliable safety logic, and compatibility with industrial automation platforms, this ALSTOM safety module is commonly deployed in rail traction drives, industrial motor control cabinets, and process automation systems where compliance with safety regulations is mandatory.
Key Functions
Safety Torque Off (STO) Protection
The primary function of this module is to implement the STO safety mechanism, which immediately removes motor torque when an emergency stop command or safety fault is detected. This prevents unexpected machine movement and significantly reduces accident risk in automated machinery.
Dual-Channel Redundant Safety Circuit
The module uses redundant safety channels with cross-monitoring to ensure that safety signals are validated before execution. This architecture improves fault detection coverage and ensures reliable shutdown even if one channel experiences a failure.
High-Speed Emergency Response
With a response time typically within milliseconds, the module ensures rapid motor shutdown during abnormal conditions such as overload, operator emergency stop activation, or control system faults. Fast response minimizes machine inertia and reduces mechanical hazards.
Integrated Diagnostics and Status Monitoring
Built-in diagnostic functions continuously monitor safety circuits, contact status, and module health. LED indicators and internal fault detection enable maintenance teams to quickly identify wiring faults, safety chain interruptions, or hardware issues.
Electrical Isolation for System Protection
The module provides galvanic isolation between control and power circuits, protecting sensitive control electronics from high-power drive circuits and improving noise immunity in high-EMI industrial environments.
Application Scenarios
Rail Transit Traction Systems
In railway traction converters and auxiliary drive systems, the module performs critical safety shutdown functions. When emergency braking or fault conditions occur, the module instantly removes motor torque to prevent uncontrolled train movement.
Industrial Motor Drive Safety
Manufacturing equipment such as conveyors, robotics, and machine tools requires safety shutdown capability. The module can be integrated into drive control cabinets to enforce safety stops during emergency conditions or maintenance operations.
Power Generation and Heavy Industry
Large turbines, pumps, and compressors used in power plants require reliable safety mechanisms. The module helps protect equipment by rapidly disabling motor torque when abnormal vibration, overspeed, or electrical faults are detected.
Automated Production Lines
In automated assembly or packaging systems, the module ensures that moving equipment stops immediately if safety sensors detect operator presence or mechanical faults, helping maintain workplace safety compliance.
