Product Details
The Honeywell 2MLI-D28A, also cataloged as the 2MLI-D28A Digital Input Module, operates as a dedicated hardware component for high-density discrete signal acquisition within MasterLogic-200 PLC systems. Configured to interface 64 digital field channels operating at 24 VDC nominal, it converts physical binary state inputs into digital logic signals routed over the internal rack backplane.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 2MLI-D28A |
| Brand | Honeywell |
| Origin | Industrial Standard Assembly |
| Weight | 0.30 lbs (0.14 kg) |
| Dimensions | Standard MasterLogic-200 Module Width |
| Operating Temp | 0 to 55 deg C |
| Power Consumption | Backplane Powered (5 VDC Bus Load Dependent) |
| Input Channels | 64 Points |
| Nominal Input Voltage | 24 VDC |
| Input Type | Sink / Source Compatible |
| Signal Classification | High-Density Digital Input Module |
| Connection Type | Multi-pin Cable Connector |
Channel-to-Channel Isolation & DCS Signal Integrity
The 2MLI-D28A integrates optocoupler isolation barriers between external field wiring terminals and the backplane logic processing paths. This channel-to-channel isolation structure prevents high-voltage electrical surges, common-mode noise, and ground potential differences across the 64 discrete points from affecting the central processor logic. By decoupling field noise from system data buses, the module ensures robust execution alongside analog cards monitoring critical 4-20 mA HART loop protocol field instruments.
Frequently Asked Questions
Q: How are field wiring connections terminated on the high-density 2MLI-D28A module?
A: Due to the high-density 64-point architecture, connections are made via dedicated multi-pin front connectors designed for pre-wired cable assemblies or terminal block interface boards.
Q: Is hot-swapping allowed for the 2MLI-D28A card during system operation?
A: No, module replacement must be performed with the base rack chassis de-energized to prevent electrical arc damage to the high-density edge connector pins and CPU backplane bus corruption.
Field Installation Guidelines
- Power off the main rack chassis supply and external 24 VDC field power sources prior to module installation.
- Insert the 2MLI-D28A into its assigned backplane slot, locking the module retaining latches securely.
- Attach pre-assembled multi-pin connector cables, ensuring strain-relief brackets are tightened to prevent accidental pin disconnection.
- Keep 24 VDC input signal cables isolated from high-voltage AC lines and motor leads inside wire ducts to suppress electromagnetic noise coupling.
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
Understanding Marshalling Cabinets in Industrial Control Systems Architecture
Industrial control system deployments rely on structured signal distribution to bridge field instrumentation with central processing hardware. A marshalling cabinet serves as the vital intermediate connection point between heavy field home-run multi-pair cables and delicate input/output (I/O) modules housed inside Programmable Logic Controller (PLC) or Distributed Control System (DCS) enclosures. By segregating field cable terminations from control hardware, engineers maintain system flexibility, safeguard controller components, and streamline commissioning workflows.
FAT vs SAT in Industrial Control Systems: Key Differences and Execution Guide
Industrial control system deployment relies on strict verification protocols to guarantee operational safety, system stability, and regulatory compliance. Commissioning complex Programmable Logic Controller (PLC) racks, Distributed Control Systems (DCS), and Safety Instrumented Systems (SIS) requires two critical milestones: the Factory Acceptance Test (FAT) and the Site Acceptance Test (SAT). Both procedures validate that system automation meets design specifications, but they occur at different stages of project execution and target distinct operational risks.
Hub vs Switch vs Router in Industrial Automation Architecture
Modern factory automation relies on reliable industrial networking infrastructure to exchange real-time field data across operational technology systems. Engineers often encounter networking hardware like hubs, switches, and routers when integrating Programmable Logic Controllers, Distributed Control Systems, and SCADA monitoring nodes. Although these devices share physical ports, they operate at different layers of the Open Systems Interconnection reference model and deliver distinct traffic management capabilities.