Product Description
The Yokogawa ST4*D AS S9191AQ-0 Multi Status Input Card is a high-reliability digital input module designed for monitoring and processing multiple discrete status signals in industrial safety and control systems. Part of Yokogawa's ProSafe-RS Safety Instrumented System (SIS) and CENTUM VP Distributed Control System (DCS), this module enables precise detection of field device statuses, such as valve positions, motor run/stop signals, and emergency shutdown (ESD) triggers. Certified to IEC 61508 SIL 2/3 standards, it ensures robust performance in hazardous environments like oil refineries, chemical plants, and power generation facilities.
Technical Specifications
Electrical Specifications:
Input Channels: 16 channels (configurable as dry contact or 24–48 V DC).
- Input Voltage Range:
Dry Contact: 0–60 V DC.
Wet Contact: 24–48 V DC (±20%).
Isolation: 1500 V AC (channel-to-channel, channel-to-system).
Response Time: ≤10 ms (typical).
- Safety Standards:
Certifications: IEC 61508 SIL 2/3, TÜV Rheinland, ATEX/IECEx Zone 2, CE, RoHS.
- Environmental Ratings:
Operating Temperature: -20°C to +60°C (-4°F to +140°F).
Humidity: 10–90% non-condensing.
Shock/Vibration: 5g (IEC 60068-2-6), 15g (IEC 60068-2-27).
Frequently Asked Questions (FAQ)
Q1: How to configure dry vs. wet contact inputs?
A: Use ProSafe-RS Engineering Studio to select the input type (dry/wet) in the channel configuration menu.
Q2: What triggers a "Channel Fault" LED?
A: Common causes include wiring shorts, open circuits, or voltage outside the configured range.
Q3: Can the ST4*D AS operate in Zone 1 hazardous areas?
A: No. For Zone 1, install in an explosion-proof enclosure or use intrinsic safety barriers (e.g., Yokogawa ZR401).
Q4: How to integrate with non-Yokogawa systems?
A: Use OPC UA gateways or Modbus TCP converters for third-party communication.
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