Overview
The Yokogawa NFDV157-S00 S2 Digital Input Module is a high-density safety-oriented digital input module designed for ProSafe-RS Safety Instrumented Systems (SIS) and compatible Yokogawa control platforms. It is engineered to reliably capture discrete ON/OFF signals from field devices and transmit them to safety controllers with high integrity and stability.
Built to meet SIL3 safety requirements, this module is widely deployed in critical process industries where system reliability and fail-safe operation are essential. The S2 revision typically represents an updated production version with improved lifecycle support and enhanced hardware consistency for long-term industrial deployment.
Technical Specifications
| Parameter | Specification |
|---|
| Model | NFDV157-S00 S2 |
| Manufacturer | Yokogawa |
| Type | Digital Input Module |
| Input Channels | 32 channels |
| Input Signal Type | 24 V DC ON/OFF signals |
| Input Voltage Range | 18–26.4 V DC |
| Input Current | Approx. 4–6 mA per channel |
| Response Time | ≤ 10–40 ms |
| Isolation | Channel-to-system isolation |
| Safety Level | SIL3 compliant (SIS applications) |
| Input Type | Contact, switch, push button, sensor signals |
| Diagnostics | Built-in self-diagnostics and fault detection |
| Power Consumption | Approx. 320 mA (5 V DC) |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -40°C to +85°C |
| Humidity | 5–95% RH non-condensing |
| Dimensions | Approx. 130 × 107 × 32 mm |
| Weight | Approx. 0.3–0.35 kg |
| Mounting Type | Rack-mounted (ProSafe-RS / DCS base unit) |
Applications
The NFDV157-S00 S2 is designed for safety-critical and process automation environments where reliable digital signal acquisition is required.
Typical applications include:
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Emergency Shutdown Systems (ESD)
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Fire & Gas Detection Systems (F&G)
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Burner Management Systems (BMS)
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Oil & gas processing plants
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Petrochemical and refinery automation
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Power generation safety systems
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Industrial safety interlock monitoring
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Critical infrastructure protection systems
Its SIL3 capability makes it ideal for applications requiring high safety integrity and dependable signal monitoring.
Advantages
The Yokogawa NFDV157-S00 S2 delivers strong safety and operational benefits:
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32-channel high-density input design reduces hardware footprint
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SIL3-certified safety performance supports critical applications
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Reliable 24 V DC signal acquisition for industrial field devices
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Integrated diagnostics and fail-safe mechanisms enhance system reliability
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Robust isolation design protects against electrical interference
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Stable performance in harsh industrial environments
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Efficient integration with Yokogawa ProSafe-RS systems
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Reduced downtime through modular and replaceable design
Technical FAQs
1. What is the main function of the NFDV157-S00 S2?
It collects digital ON/OFF signals from field devices and transmits them to safety or control systems.
2. How many input channels are available?
It supports 32 digital input channels.
3. What type of signals does it accept?
24 V DC discrete signals from switches, sensors, and push buttons.
4. Is this module suitable for safety systems?
Yes, it is designed for SIL3 safety applications.
5. What is the response time?
Typically between 10 ms and 40 ms depending on configuration.
6. Does it include diagnostics?
Yes, it features continuous self-diagnostics for fault detection.
7. What systems is it compatible with?
Yokogawa ProSafe-RS and related DCS/SIS platforms.
8. What is the operating temperature range?
-20°C to +70°C.
9. What is the weight of the module?
Approximately 0.3–0.35 kg.
10. What does the S2 version indicate?
It represents an updated hardware or production revision for improved reliability and lifecycle support.
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