Product Details
Configured for multi-channel discrete state switching in CENTUM systems, the Yokogawa ST7*A (ST7 Multipoint Status Output Card) provides direct physical/electrical execution.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | ST7*A |
| Brand | Yokogawa |
| Origin | Japan |
| Module Type | Multipoint Status Output Card |
| Output Channels | Multiple Relay Output Points |
| Output Contact Type | Form-C, Normally Open (N.O.), Normally Closed (N.C.) |
| Power Consumption | 24 V DC +/-10% (Card Logic); 85 to 132 V AC / 170 to 264 V AC (Nest Dependent) |
| Mounting Form | Horizontal or Vertical Mounting Nests (e.g., RYH-32, RYV-11) |
| System Connection | Block Connector Cable to DCS Backplane |
| Operating Temp | 0 to 50 deg C |
Channel-to-Channel Isolation & Loop Protocol Connectivity
The ST7*A relay output card utilizes galvanic relay isolation barriers between control logic circuits and field actuator wiring. Channel-to-channel isolation prevents electrical transients, back-EMF spikes, and common-mode noise from propagating from high-voltage field loads back into sensitive controller backplane buses. This isolated contact interface enables parallel operation alongside 4-20 mA HART loop protocol instruments within the same rack infrastructure.
Frequently Asked Questions
Q: What contact configurations are supported across the output channels of the ST7*A?
A: The channel relays provide potential-free dry contact configurations including Form-C, Normally Open (N.O.), and Normally Closed (N.C.) arrangements.
Q: How does the power supply specification vary depending on cabinet mechanical hardware?
A: Internal logic runs on 24 V DC +/-10%, while field relay coils and nest electronics receive line power (85-132 V AC or 170-264 V AC) based on the targeted mounting nest model (e.g., RYH-32 or RYV-11).
Field Installation Guidelines
Slot the ST7*A card vertically or horizontally into the selected RYH-32 or RYV-11 mounting nest until the rear connector seats into the backplane socket. Connect the block connector interface cable to establish digital communication with the DCS rack. Ensure inductive loads (such as magnetic solenoid valves or motor starter coils) are fitted with external RC snubber networks or flyback diodes across field terminals to prevent contact arc degradation.
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.
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