Product Details
The Yokogawa RS81*B, also cataloged as the RS81 Interface Module Card, operates as a dedicated hardware component for serial RS-232C data communication within Yokogawa CENTUM VP control system racks. The module establishes point-to-point asynchronous physical data links between central processor units and third-party subsystems. Onboard surface-mount technology (SMT) circuitry executes signal formatting, parity checking, and buffer management across the backplane bus interface to maintain deterministic transaction timing.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | RS81*B |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.8 kg |
| Dimensions | 25 mm x 254 mm x 381 mm (1.0 in x 10.0 in x 15.0 in) |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | Backplane bus powered (5 VDC / 24 VDC rail) |
| Communication Interface | RS-232C serial port |
| Assembly Technology | High-precision surface-mount technology (SMT) |
| System Compatibility | Yokogawa CENTUM VP |
Serial Interface Architecture and Galvanic Isolation
The RS81*B module coordinates RS-232C serial telemetry transfers while decoupling field communication paths from internal backplane logic rails. Galvanic channel-to-channel isolation protects signal drivers from common-mode electrical noise and ground loops when interfacing with external controllers or smart instrumentation executing 4-20 mA HART loop protocol conversion routines. Onboard buffer circuits handle asynchronous frame transmission to prevent packet collisions during cyclic DCS processor updates.
Frequently Asked Questions
Q: What physical communication protocol is supported by the RS81*B interface card?
A: The module incorporates an RS-232C serial interface driver designed for direct point-to-point asynchronous communication with external devices.
Q: Can the RS81*B module be extracted or replaced while the host rack is energized?
A: Module removal requires isolating the serial interface loop; online replacement is permitted only when supported by the specific CENTUM VP subrack backplane redundancy configuration.
Q: How does the card protect backplane circuits against serial line surges?
A: Integrated galvanic isolation barriers isolate the RS-232C signal pins from the internal system bus, suppressing voltage spikes and high-frequency noise from field wiring.
Field Installation Guidelines
- Module Alignment: Align the RS81*B card edges with the subrack guide slots inside the CENTUM VP cabinet. Push the module smoothly until the rear backplane connectors fully lock into the motherboard.
- Retaining Screw Fastening: Tighten upper and lower retaining screws on the front panel to lock the assembly in place and ensure frame ground contact.
- Cable Shield Termination: Connect RS-232C serial cable shields to the cabinet functional earth (FE) ground bus at a single termination point to prevent noise coupling.
- Thermal Constraints: Maintain adequate ventilation above and below the card slot array to allow natural convection, keeping cabinet operating temperatures within 0 to 60 deg C.
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
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