Overview
The Yokogawa SDV144-S33, also cataloged as the SDV144-S33 Digital Input Module, provides isolated 16-channel contact input processing for Yokogawa N-IO systems. It receives external 24 VDC discrete signals and converts field contact states into digital status data for control system monitoring.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | SDV144-S33 |
| Brand | Yokogawa |
| Product Type | Digital Input Module |
| Origin | Japan |
| Weight | 0.4 kg |
| Dimensions | 3.8 x 11.4 x 13 cm |
| Input Channels | 16 channels, module isolation |
| Input Type | Digital contact input |
| Input Current | 6 mA +/- 20 % |
| Contact Rating | 24 VDC +20 % / -10 %, 10 mA or greater |
| External Power Supply | 24 VDC +20 % / -10 % |
| Maximum Input Voltage | 30.0 VDC instantaneous maximum |
| ON Resistance | 1 kohm maximum |
| OFF Resistance | 100 kohm minimum |
| Input Response Time | 40 ms maximum |
Yokogawa DCS Digital Input Signal Isolation Characteristics
The SDV144-S33 applies channel isolation to digital input circuits, allowing separate field contact signals to be processed within the Yokogawa control architecture. Therefore, the module reduces signal interference between input points and maintains stable discrete status acquisition.
The module supports 24 VDC contact input signals with defined ON and OFF resistance thresholds. Furthermore, the 40 ms maximum input response time enables status monitoring for standard process control applications.
For Yokogawa DCS installations, digital modules typically operate with isolated field wiring interfaces. The isolation design supports channel-to-channel protection requirements when connecting external switches, relay contacts, and discrete field devices.
Frequently Asked Questions
Q: How many digital input points does the Yokogawa SDV144-S33 provide?
A: The SDV144-S33 provides 16 digital input channels with module isolation for discrete signal acquisition.
Q: What field voltage does the SDV144-S33 accept?
A: The module accepts 24 VDC external power and contact input signals within the specified voltage range of 24 VDC +20 % / -10 %.
Q: What is the input response time of the SDV144-S33?
A: The maximum input response time is 40 ms for digital status detection.
Field Installation Guidelines
- Install the SDV144-S33 according to the Yokogawa system hardware configuration requirements.
- Verify the 24 VDC field supply polarity before connecting external contact circuits.
- Use appropriate shield grounding practices when installing signal cables near high-voltage equipment.
- Separate digital input wiring from power cables to reduce electrical interference.
- Confirm field contact resistance values remain within the specified ON and OFF thresholds before commissioning.
- Check module seating and backplane connection status during installation and maintenance procedures.
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