Honeywell 2MLI-D22B Digital Input Module | Replacement, Equivalent & Selection Guide
The Honeywell 2MLI-D22B is a Digital Input Module designed for use within the Honeywell TDC 3000 Distributed Control System (DCS). It provides reliable discrete signal acquisition from field devices, enabling precise process monitoring and control in demanding industrial environments. This page serves as a comprehensive selection, replacement, and compatibility reference for engineers and procurement teams.
Technical Specifications
- Part Number: 2MLI-D22B
- Manufacturer: Honeywell Process Solutions
- Module Type: Digital Input (DI)
- Platform: TDC 3000 / TotalPlant Solution (TPS)
- Series: Multifunction Link Interface (MLI)
- Input Channels: 22 discrete input channels (typical for D22 series)
- Signal Type: Dry contact / wet contact discrete inputs
- Communication: Local Control Network (LCN) backplane interface
- Form Factor: Card/module for TDC 3000 card cage
- Operating Temperature: 0°C to 60°C
- Power Supply: Supplied via backplane
- Compliance: CE, UL (verify with datasheet for exact certifications)
Compatible Replacement & Equivalent Models
The following models are commonly evaluated as functional equivalents or drop-in replacements for the 2MLI-D22B. Always verify firmware revision and backplane compatibility before substitution.
- Honeywell 2MLI-D22A – Earlier revision; functionally similar, check firmware compatibility
- Honeywell 2MLI-D22C – Later revision with potential firmware enhancements
- Honeywell 51304485-100 – Alternative DI module for TDC 3000 / TPS platforms
- Honeywell 51304485-150 – Enhanced variant; confirm channel count and I/O mapping
- Honeywell 51401469-100 – Multifunction I/O card; evaluate for mixed DI/DO applications
Note: Cross-referencing should be performed by a qualified controls engineer. Konmask.com can assist with compatibility verification — contact us before ordering a replacement.
Why Choose the Original 2MLI-D22B
- Guaranteed OEM Compatibility: Designed and validated specifically for TDC 3000 / TPS card cages and LCN architecture
- Proven Field Reliability: Widely deployed in refining, petrochemical, and power generation facilities globally
- Minimal Integration Risk: No firmware re-flashing or I/O remapping required when replacing like-for-like
- Long Service Life: Robust industrial-grade components rated for continuous 24/7 operation
- Simplified Spare Parts Management: Standardized module format reduces stocking complexity
Typical Applications
- Refinery and petrochemical plant DCS control loops
- Power generation unit monitoring (turbine, boiler, BOP systems)
- Pulp & paper process control
- Chemical batch processing with discrete event monitoring
- Water and wastewater treatment facility automation
- Pharmaceutical manufacturing with GMP-compliant control systems
System Compatibility
- DCS Platform: Honeywell TDC 3000, TotalPlant Solution (TPS)
- Network: Local Control Network (LCN)
- Card Cage: Standard TDC 3000 card cage (verify slot type)
- Software: Compatible with Honeywell Universal Station (US) and Application Module (AM) configurations
- Not Compatible With: Honeywell Experion PKS (different hardware architecture — separate module family required)
Selection Guide
Use the following criteria to confirm the 2MLI-D22B is the correct module for your application:
- Step 1 – Confirm Platform: Verify your DCS is TDC 3000 or TPS (not Experion PKS or Safety Manager)
- Step 2 – Check Channel Count: Confirm you require 22 discrete input channels; if more are needed, consider a higher-density module
- Step 3 – Signal Type: Confirm field devices output dry or wet contact signals compatible with this module’s input specifications
- Step 4 – Revision Level: Match the revision suffix (A/B/C) to your existing installed base to avoid firmware conflicts
- Step 5 – Slot Availability: Verify an open, compatible slot exists in your TDC 3000 card cage
- Step 6 – Contact Us: Share your system configuration details with Konmask.com for a final compatibility check before purchase
Quality Assurance & Sourcing
- All modules sourced through verified industrial automation supply channels
- Pre-shipment functional inspection and visual QC performed on every unit
- Original OEM packaging preserved where available; clearly labeled if repackaged
- Traceability documentation (lot number, revision, test records) available on request
- Warranty: 90-day replacement warranty against DOA or functional defects
- Export compliance: ECCN classification and export documentation available for international orders
How to Order
- Confirm part number: 2MLI-D22B (include revision if known)
- Specify quantity required
- Provide your shipping destination and preferred Incoterm (EXW, FOB, CIF, DDP)
- Contact us via email or phone for a formal quotation with lead time
- Purchase Order accepted; T/T, L/C, and other B2B payment terms available
📧 support@konmask.com | 📞 +0086 19859288691
Replacement & Compatibility FAQ
Q: Can the 2MLI-D22B replace a 2MLI-D22A directly?
A: In most cases yes, but firmware revision compatibility must be verified with your TDC 3000 system version. Contact us for guidance.
Q: Is this module compatible with Honeywell Experion PKS?
A: No. The 2MLI-D22B is designed exclusively for TDC 3000 / TPS architecture. Experion PKS uses a different I/O module family (Series C or CIOM-A).
Q: Do you supply new, refurbished, or surplus units?
A: We supply both new OEM stock and tested surplus units. Condition is clearly stated on each order confirmation.
Q: What is the lead time?
A: In-stock units ship within 3–5 business days. Out-of-stock items typically have a 2–6 week lead time depending on sourcing. Contact us for current availability.
Q: Can you provide a Certificate of Conformance (CoC)?
A: Yes. CoC and inspection reports are available upon request for all orders.
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Contact: support@konmask.com | +0086 19859288691
