Digital guide
You are here:
Yokogawa S9251ALPS31*A
Product Introduction: A high-density digital input module for Yokogawa S900 series I/O systems, featuring 24 isolated channels with ALPS screw terminals for secure wiring. It is designed for monitoring discrete signals in harsh industrial environments with ISA G3 corrosion resistance and wide temperature operation.
Technical Specifications:
- Input Channels: 24 isolated channels (group isolation)
Detailed content
- Input Type: Dry contact, NPN/PNP transistor (24 V DC)
- Isolation Voltage: 1500 V AC (1 minute) between input groups and system
- Response Time: ≤ 5 ms
- Power Supply: 24 V DC (system-powered)
- Operating Temperature: -20°C to 70°C (ISA G3)
- Terminal Type: ALPS screw terminals (anti-vibration, high contact reliability)
- Certifications: CE, CSA, SIL 2 compliant
Functional Features:
- High-density 24-channel design maximizes cabinet space utilization
- Group isolation prevents cross-channel interference and enhances system reliability
- ALPS terminals provide secure wiring resistance to industrial vibration and temperature cycling
- Status LEDs for each channel indicate signal presence and fault conditions
- Hot-swappable design allows module replacement without system shutdown
- Seamless integration with S900 series I/O racks and CENTUM DCS systems
Application Scenarios: Refineries, chemical plants, power generation facilities, and automotive manufacturing plants where high-density digital input is required to monitor limit switches, valve positions, and alarm signals.
