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Yokogawa S9921DH-00
Product Introduction: A high-speed digital input module for Yokogawa S900 series I/O systems, designed for capturing fast-changing discrete signals with configurable filtering to eliminate noise interference. It features 24 isolated channels with group isolation, making it ideal for monitoring high-speed limit switches, encoder pulses, and alarm signals in industrial process control and automation systems.
Technical Specifications:
- Input Channels: 24 channels (group isolation, 8 channels per group)
Detailed content
- Input Type: 24 V DC dry contact, NPN/PNP transistor
- Input Voltage: ON: 18–26.4 V DC; OFF: ≤5.0 V DC
- Isolation Voltage: 1500 V AC (1 minute) between groups and system
- Response Time: ≤1 ms (filter off), 1–100 ms (configurable filter)
- Input Current: 3.5 mA per channel (at 24 V DC)
- Power Supply: 24 V DC (system-powered), 0.8 W max
- Terminal Type: ALPS screw terminals (anti-vibration)
- Operating Temperature: -20°C to 70°C (ISA G3 compliant)
- Certifications: CE, CSA, SIL 2
Functional Features:
- Configurable high-speed filtering eliminates false triggers from industrial noise and vibration
- 24-channel density maximizes I/O utilization in control cabinets
- Group isolation prevents cross-channel interference and enhances system reliability
- Per-channel status LEDs provide real-time visibility of signal presence and module health
- Hot-swappable design allows module replacement without system shutdown
- Seamless integration with S900 I/O racks and CENTUM VP DCS for centralized control and monitoring
Application Scenarios: Automotive manufacturing, packaging machinery, material handling systems, and chemical plants where high-speed digital input with noise filtering is required to monitor fast-acting sensors and actuators.
