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
Understanding Siemens PLC Memory Cards: MMC, SMC, and SD Solutions in Industrial Automation
Memory management plays a pivotal role in maintaining control system reliability across modern manufacturing plants. Industrial control systems rely on specialized memory cards to store project logic, firmware updates, and retentive system data. Siemens uses several memory architectures, including Micro Memory Cards (MMC) and SIMATIC Memory Cards (SMC). Engineers must understand these hardware variations to ensure zero data loss and minimize downtime during maintenance routines.
Redefining Control Systems: The Rise of Flexible I/O Modules in Industrial Automation
Conventional input-output architectures often limit engineering agility and inflate long-term inventory costs. Today, Flexible Input/Output Modules (FIOM) are transforming how control system engineers design, commission, and maintain automation infrastructure. By allowing individual channel software configuration, FIOM technology bridges the gap between rigid hardware design and dynamic plant requirements.
Understanding Modern SCADA Systems: Architecture, Communication Topologies, and Industrial Applications
Supervisory Control and Data Acquisition (SCADA) systems form the digital backbone of modern industrial automation. They collect critical field data, transmit signals across vast distances, and empower plant operators with real-time process visibility. Across modern infrastructures, SCADA solutions streamline centralized control and maintain continuous operational uptime.