Yokogawa ASS9981DE-01 Back Plane | Replacement, Equivalent & Selection Guide
The Yokogawa ASS9981DE-01 is a DCS backplane module designed for use in Yokogawa CENTUM VP and CS3000 distributed control systems. As a critical interconnect component, it provides the physical and electrical bus infrastructure for I/O and controller modules. This page serves as a comprehensive selection, replacement, and compatibility reference for engineers and procurement teams sourcing this part.
Technical Specifications
- Part Number: ASS9981DE-01
- Manufacturer: Yokogawa Electric Corporation
- Module Type: Back Plane / Backplane Bus Module
- Compatible System: CENTUM VP, CENTUM CS3000
- Weight: Approx. 900 g
- Country of Origin: Japan
- Condition Available: New (OEM), Refurbished, Tested Surplus
- Warranty: 12 months (new); 6 months (refurbished)
Compatible Replacement & Equivalent Models
When the ASS9981DE-01 is unavailable or discontinued, the following models may serve as functional equivalents or drop-in replacements depending on your system revision. Always verify firmware and hardware revision compatibility before substitution.
- ASS9981DE-02 — Revised version with minor PCB updates; functionally equivalent in most CENTUM VP configurations
- ASS9981DF-01 — Alternative backplane variant; confirm slot count and bus type before use
- ANB10D / ANB11D — Node interface backplanes used in CS3000; applicable in specific rack configurations
- Third-party compatible backplanes — Available from certified Yokogawa integrators; must match bus protocol and physical form factor
Note: Konmask.com recommends consulting your system documentation or contacting our technical team before substituting backplane modules in live DCS environments.
Why Choose the Original Model
- OEM Guaranteed Compatibility: Designed and tested by Yokogawa for seamless integration with CENTUM VP/CS3000 hardware
- Signal Integrity: Factory-calibrated bus connections minimize noise and communication errors in critical control loops
- Long Service Life: Industrial-grade PCB and connector materials rated for continuous 24/7 operation
- Regulatory Compliance: Meets IEC 61511 / IEC 61508 functional safety standards applicable to process control
- Reduced Commissioning Risk: No firmware or configuration changes required when replacing like-for-like
Typical Applications
- Oil & gas upstream/downstream DCS control panels
- Chemical and petrochemical plant automation racks
- Power generation and utilities control systems
- Pharmaceutical batch control and SCADA integration
- Pulp, paper, and continuous process manufacturing
- Water treatment and environmental monitoring systems
System Compatibility
| System Platform | Compatible | Notes |
|---|---|---|
| Yokogawa CENTUM VP | ✅ Yes | Primary target platform |
| Yokogawa CENTUM CS3000 | ✅ Yes | Verify rack generation |
| Yokogawa CENTUM CS1000 | ⚠️ Partial | Confirm hardware revision |
| Yokogawa ProSafe-RS | ❌ No | Different safety bus architecture |
| Third-party DCS (ABB, Emerson) | ❌ No | Not cross-platform compatible |
Selection Guide
Use the following criteria to confirm the ASS9981DE-01 is the correct backplane for your application:
- Step 1 — Identify your DCS generation: Confirm whether your system is CENTUM VP R4/R5/R6 or CS3000 R3. The backplane revision must match the controller generation.
- Step 2 — Count required I/O slots: Verify the slot count on the ASS9981DE-01 matches your rack configuration (refer to Yokogawa IM 33J01B30-01EN).
- Step 3 — Check bus type: Confirm V-net or Vnet/IP bus compatibility with your field control station (FCS).
- Step 4 — Review power supply compatibility: Ensure the backplane is rated for your rack’s power supply module (e.g., PW481, PW482).
- Step 5 — Confirm physical dimensions: Measure rack depth and slot pitch before ordering to avoid mechanical interference.
Quality Assurance & Sourcing
- All units sourced from authorized Yokogawa distributors or certified surplus channels
- Pre-shipment inspection: visual, functional, and continuity testing on all backplane connectors
- Anti-static packaging with humidity indicator cards for safe international transit
- Traceability documentation available upon request (batch records, test reports)
- Export compliance: ECCN classification and customs documentation provided for cross-border orders
How to Order
- Online: Add to cart directly on this page — stock availability shown in real time
- Email RFQ: Send part number, quantity, and required delivery date to support@konmask.com
- Phone/WhatsApp: +0086 19859288691 (Mon–Fri, 09:00–18:00 CST)
- Bulk / Project Orders: Volume pricing available for orders of 3+ units — contact us for a formal quotation
- Lead Time: In-stock items ship within 1–3 business days; sourced items 7–21 business days
Replacement & Compatibility FAQ
Q: Can I use ASS9981DE-02 as a direct replacement for ASS9981DE-01?
A: In most CENTUM VP installations, yes. The -02 revision includes minor PCB improvements but maintains backward compatibility. Confirm with your Yokogawa system integrator for safety-critical loops.
Q: Is the ASS9981DE-01 still in production?
A: Yokogawa periodically revises or discontinues legacy backplane models. Contact Konmask.com to check current OEM availability and recommended successor parts.
Q: Can this backplane be repaired instead of replaced?
A: Backplane repair is possible for connector damage or trace faults, but is not recommended for safety-instrumented systems. Replacement with a tested OEM unit is the preferred approach.
Q: Do you provide installation support?
A: We provide technical documentation and remote guidance. On-site commissioning support can be arranged through our partner network — contact us for details.
Q: What is your return policy for this part?
A: Unused, unopened items may be returned within 30 days. Tested/installed units are non-returnable unless covered under warranty claim.
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Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
