YOKOGAWA RS81*B (AS S9826AM-0) – High-Speed Interface Card | CENTUM CS / VP DCS Platform
Engineering Background
The YOKOGAWA RS81*B, manufactured under part number AS S9826AM-0, is a dedicated interface card engineered for the CENTUM CS and CENTUM VP Distributed Control System (DCS) platforms — YOKOGAWA’s flagship process automation architecture deployed across refining, petrochemical, power generation, and advanced manufacturing facilities worldwide. This module serves as a critical communication bridge within the field control station (FCS), enabling deterministic, high-integrity data exchange between the process I/O subsystem and the supervisory control network.
Product Positioning
Designed for engineers who demand zero-compromise reliability in continuous-process environments, the RS81*B delivers the signal fidelity and protocol compliance required for SIL-rated and non-SIL control loops alike. Konmask.com sources this module from verified surplus and decommissioned plant inventories, providing procurement teams with a cost-effective, lead-time-independent alternative to OEM new supply — without sacrificing functional integrity.
Complete Technical Specifications
- Manufacturer: YOKOGAWA Electric Corporation
- Part Number: RS81*B
- OEM Reference / Alternate PN: AS S9826AM-0
- Module Type: Interface Card (Communication / Signal Interface)
- Compatible Platform: CENTUM CS Series, CENTUM VP Series (Field Control Station)
- Form Factor: PCB card module, rack-mount / card-cage insertion
- Communication Role: FCS internal bus interface — bridges I/O modules to the control processor
- Operating Temperature: 0 °C to +55 °C (storage: −25 °C to +70 °C)
- Humidity: 5% to 95% RH, non-condensing
- Power Supply: Supplied via backplane / card-cage bus (no external PSU required)
- Weight: Approx. 800 g (module + packaging)
- Compliance: CE Marking; manufactured to IEC 61511 / IEC 61508 process safety standards
- RoHS Status: Confirm with Konmask technical team for specific production batch
Proven Application Environments
- Oil & Gas: Upstream wellhead control, midstream pipeline SCADA integration, downstream refinery DCS migration projects
- Petrochemical & Chemical: Reactor temperature/pressure loop control, batch process sequencing, safety instrumented system (SIS) interfacing
- Power Generation: Boiler management systems, turbine control integration, grid-tie protection relay interfacing
- Pulp & Paper / Pharmaceuticals: Continuous process monitoring, FDA 21 CFR Part 11-compliant data acquisition architectures
- Water & Wastewater: SCADA-linked FCS deployments requiring long-term spare parts availability
Engineering Advantages
- Drop-in Compatibility: Direct replacement for existing RS81*B slots in CENTUM CS/VP FCS cabinets — no firmware reconfiguration required in standard swap scenarios
- Deterministic Latency: Engineered for YOKOGAWA’s proprietary high-speed control bus, ensuring scan-cycle-consistent data throughput
- Redundancy Support: Compatible with YOKOGAWA’s dual-redundant FCS configurations when paired with appropriate redundancy modules
- Long Service Life: Industrial-grade components rated for continuous 24/7 operation in Class 1 control room environments
- Immediate Availability: Konmask maintains physical stock — eliminates 12–26 week OEM lead times typical for legacy CENTUM CS components
System Architecture & Signal Flow
Within the CENTUM CS/VP Field Control Station, the RS81*B occupies the interface card slot of the FCS card cage. It arbitrates communication between the I/O module bus (carrying raw field signals from transmitters, actuators, and field devices) and the FCS processor card, which executes the control application. The card implements YOKOGAWA’s proprietary bus protocol, ensuring time-stamped, error-checked data frames are delivered to the control processor within each defined scan cycle. In redundant FCS configurations, the RS81*B participates in bumpless switchover logic, maintaining process continuity during active/standby transitions.
Sourcing & Quality Verification
- Source: Verified surplus from decommissioned YOKOGAWA CENTUM CS/VP installations; no counterfeit-risk gray-market channels
- Inspection: Each unit undergoes visual inspection (PCB, connectors, component integrity) and functional verification prior to listing
- Condition: Used / refurbished — full functional condition; cosmetic wear consistent with controlled industrial environment service
- Packaging: Anti-static ESD bag + foam-padded carton; humidity indicator card included
- Documentation: Original YOKOGAWA part label retained; certificate of conformance available on request
- Warranty: 90-day Konmask operational warranty — DOA replacement or full refund
Procurement Process
- Confirm Compatibility: Verify your FCS cabinet model and card-cage slot designation against the RS81*B / AS S9826AM-0 part number. Contact our technical team if cross-referencing is required.
- Request Quote / Place Order: Add to cart or contact support@konmask.com for volume pricing, lead-time confirmation, and export documentation.
- Export & Compliance: Konmask handles CN export customs documentation. Buyers are responsible for import duties and compliance in their jurisdiction. EAR99 classification — no export license required for most destinations.
- Shipping: DHL Express / FedEx International Priority standard. Sea freight available for multi-unit orders. Typical transit: 3–7 business days to major industrial hubs.
- Incoming Inspection: Recommended: perform incoming ESD-safe inspection and bench test against a known-good FCS chassis before installation in live process.
Technical FAQ
Q: Is the RS81*B compatible with both CENTUM CS and CENTUM VP?
A: Yes. The RS81*B / AS S9826AM-0 is used across both CENTUM CS and CENTUM VP FCS platforms. Confirm your specific FCS generation with YOKOGAWA documentation or contact Konmask for cross-reference support.
Q: Can this card be used in a redundant FCS configuration?
A: Yes, provided the FCS chassis and redundancy module (e.g., RB401) are correctly configured. The RS81*B supports YOKOGAWA’s standard dual-redundant FCS architecture.
Q: What is the difference between RS81*B and RS81B?
A: The asterisk (*) in YOKOGAWA nomenclature denotes a hardware revision suffix. RS81*B refers to the current or latest revision of the RS81B series. Functionally equivalent for standard replacement purposes — confirm with your site’s CENTUM revision documentation if operating in a validated environment.
Q: Do you provide a test report or functional verification certificate?
A: A functional verification statement is available upon request. For SIL-rated loop applications, we recommend independent incoming inspection by a qualified instrument technician.
Q: What is your return policy?
A: 90-day DOA warranty. Units must be returned in original ESD packaging. Contact support@konmask.com to initiate an RMA.
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