Product Details
The Yokogawa ST4*D, also cataloged as the ST4*D Multi-Status Input Card, operates as a dedicated hardware component for discrete status monitoring and relay contact switching within Yokogawa CENTUM-XL and u-XL DCS platforms. It accepts non-voltage contact or open-collector input signals and drives configurable relay outputs across a high-density 16-card nest structure.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | ST4*D |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.9 kg |
| Dimensions | 25 mm x 178 mm x 51 mm |
| Operating Temp | 0 to 50 deg C |
| Power Consumption | 24 VDC +/-10% (Horizontal) / 85-132 VAC, 170-264 VAC, 24 VDC +/-10% (Vertical) |
| Product Type | Multi-Status Input Card |
| Input Signal Types | Non-voltage contact, Open collector |
| Output Contact Types | Configurable Normally Open (N.O.), Normally Closed (N.C.), or Form-C |
| Mounting Form Factor | Nest-mounting type (Up to 16 cards per nest), Horizontal or Vertical |
| Visual Indicators | Front-panel LED relay operation indicators |
Channel-to-Channel Isolation and DCS Integration
The ST4*D card features channel-to-channel isolation architecture designed to prevent ground loops and shield internal system buses from field-side electrical surges. Non-voltage and open-collector field inputs pass through high-speed isolation stages before energizing the output relay matrix. The board's relay outputs can be mapped as Normally Open, Normally Closed, or Form-C contacts, providing physical signal translation for control units across CENTUM-XL and u-XL system architectures.
Frequently Asked Questions
Q: What input contact formats can be wired directly to the ST4D input channels?
A: The ST4D accepts non-voltage dry contacts and transistor open-collector outputs directly from field devices.
Q: How do power supply requirements differ between mounting orientations?
A: Horizontally mounted configurations accept 24 VDC +/-10% power, whereas vertically mounted assemblies accommodate 24 VDC +/-10%, 85-132 VAC, or 170-264 VAC line inputs depending on backplane selection.
Q: How is the physical operation of individual channels verified on the card?
A: Front-panel LED indicators illuminate corresponding to each channel state to provide real-time visual confirmation of relay energization.
Field Installation Guidelines
- ESD Protection: Always ground yourself with an anti-static wrist strap before touching the module to prevent electrostatic damage to internal components.
- Nest Insertion: Ensure the nest chassis power is turned off before inserting or removing the card from the mounting rack. Slide the module squarely along the guide rails until fully seated in the backplane connector.
- Wiring Practices: Route dry contact field wiring separately from high-voltage AC utility wiring to reduce induced electrical noise on open-collector lines.
- Chassis Grounding: Connect cable shields and rack framework directly to the dedicated instrument earth system to maintain single-point isolation.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Mastering Wire Identification in Industrial Automation: The Power of Ferrules and Cross-Ferruling
Proper wire labeling forms the cornerstone of reliable control system installation and long-term maintenance. In complex industrial automation environments, technicians terminate thousands of conductor ends inside control panels, marshalling racks, and field junction boxes. Ferrules serve as individual tube-shaped sleeve markers slipped onto conductors before final termination. While technicians historically relied on pre-printed individual letter rings, modern control panel builders utilize automated ferrule printing machines. These thermal-transfer printers generate durable, single-sleeve heat-shrink tags directly matching approved wiring schematics, significantly accelerating cabinet assembly workflows.
Understanding Marshalling Cabinets in Industrial Automation and Control Systems
Marshalling cabinets serve as the crucial connection hub between field instruments and centralized processing units. In large DCS and PLC control system architectures, hundreds of multipair field cables run from local junction boxes to the central instrument equipment room. The marshalling cabinet houses field terminal blocks, surge arresters, intrinsic safety isolation barriers, and interposing relays. By segregating field field-wiring terminations from sensitive processor hardware, engineers protect expensive controller backplanes from high-voltage transients. Consequently, this modular separation dramatically streamlines maintenance workflows and simplifies system expansion.
Essential Best Practices for PLC Wiring and Installation in Industrial Automation
Successful control system deployment begins with thoroughly reviewing manufacturer technical documentation. Controllers from major brands like Allen-Bradley, Siemens, and Schneider Electric feature unique terminal layouts. Engineers must verify voltage requirements before connecting power cables to prevent catastrophic equipment damage. Standard line connections require strict adherence to regional electrical codes and proper wire color coding. Furthermore, panel builders should always establish a robust low-impedance ground connection using at least 16-AWG copper conductor tied directly to the main plant grounding grid.