TV8S 335-02Z-ST Dual Contact Mechanical Interlock Switch IP67 Stainless Steel Machine Guard

1. ​Product Overview​

The Schmersal TV8S 335-02Z-ST is an advanced safety logic module designed for centralized control of safety functions in industrial automation systems. This DIN-rail mounted unit integrates safety monitoring, diagnostic feedback, and relay control into a single compact device (45mm width) rated for ​IP20​ enclosures. Engineered for use with Schmersal's AZM400 safety system, it features ​20 safety contact points​ ("335" variant) and solid-state ​Safe Torque Off (STO) outputs​ ("02Z-ST" suffix). Key functionalities include dual-channel monitoring of safety devices (e.g., interlock switches, light curtains), programmable time delays, and cross-circuit diagnostics. Its black polycarbonate housing supports operation in ambient temperatures of ​​-25°C to +55°C, making it ideal for control panels requiring high-integrity safety processing.

2. ​Key Technical Parameters​

• ​Voltage Range:​​ 24V DC ±10%
• ​Safety Contacts:​​ 20 force-guided contacts (8 NC + 8 NO + 4 freely configurable)
• ​STO Outputs:​​ 2 semiconductor outputs (3A safety switching)
• ​Safety Ratings:​​ SIL 3 (IEC 62061), PL e (ISO 13849-1 Cat. 4)
• ​Diagnostic LEDs:​​ Per-channel status indication (green/red)
• ​Response Time:​​ <100ms for safety signal processing
• ​Max. Load:​​ 6A per contact @ 250V AC
• ​Communication:​​ RS-485 (for system integration)
• ​Standards Compliance:​​ IEC 62061, ISO 13849-1, UL 508
• ​Mechanical Life:​​ 10 million operations

3. ​Primary Applications and Use Cases​

This module centralizes safety logic for complex machinery like ​automated assembly lines, ​robotic cells, and ​material handling systems. It processes signals from safety devices (emergency stops, guard locks, light curtains) to execute coordinated safety actions. Typical deployments include:

• Managing safety zones in automotive manufacturing
• Monitoring access gates on CNC machining centers
• Controlling STO functionality on conveyor drives
• Integrating safety mats in packaging machinery
• Providing diagnostic feedback to PLC/HMI systems via RS-485

4. ​Product Advantages and Functional Benefits​

• ​Centralized Safety Logic:​​ Reduces wiring complexity by 60% compared to relay-based systems
• ​Flexible Configuration:​​ Freely assignable contacts adapt to machine-specific safety sequences
• ​Diagnostic Transparency:​​ Per-channel LED status enables rapid troubleshooting
• ​STO Integration:​​ Direct control of drive safety functions without external components
• ​Compliance Optimization:​​ Pre-validated SIL 3/PL e architecture simplifies certification
• ​Space Efficiency:​​ 45mm width saves panel space versus conventional safety relays
• ​Cross-Circuit Monitoring:​​ Detects contact welding and channel discrepancies
• ​Time-Delay Functionality:​​ Programmable restart interlock delays (0.1-30s)

5. ​Core Functionality and Safety Operation​

The TV8S 335-02Z-ST operates as a programmable safety hub. Dual-channel safety inputs (e.g., from door switches) are continuously monitored for discrepancies. Valid signals trigger configurable logic: STO outputs can disable drives within 100ms, while force-guided contacts control peripheral devices. A critical innovation is its ​contact monitoring logic​ - if an NC contact welds shut, the module automatically locks affected circuits and illuminates fault LEDs while maintaining safe operation of other channels. The RS-485 interface transmits diagnostic codes to higher-level controllers, enabling predictive maintenance. Reset requires deliberate manual intervention after fault resolution, ensuring safety integrity. Integration with Schmersal's AZM400 ecosystem allows scalable safety architectures for everything from single machines to plant-wide systems.

Packaging & Shipping

Company Information
Xiamen ZhiCheng Automation Technology Co., Ltdit is a leading global supplier of control system components. We specialize in control systems and drives.

With many years of experience in the industrial sector, we consistently deliver the highest quality of spare parts.which make sure that all this jobs are

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