Product Details
The Honeywell 2MLI-D22A, also cataloged as the 2MLI-D22A Digital Input Module, operates as a dedicated hardware component for discrete field signal processing within MasterLogic-200 PLC platforms. It connects up to 16 digital field channels operating at 24 VDC nominal, executing physical signal acquisition via sink or source wiring configurations to route input states to the CPU backplane bus.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 2MLI-D22A |
| Brand | Honeywell |
| Origin | Industrial Standard Assembly |
| Weight | 0.22 lbs (0.10 kg) |
| Dimensions | Standard MasterLogic-200 Module Width |
| Operating Temp | 0 to 55 deg C |
| Power Consumption | Backplane Powered (System Bus Load Dependent) |
| Input Channels | 16 Points |
| Input Voltage | 24 VDC |
| Input Type | Sink / Source Compatible |
| Signal Classification | VDC Logic I/O Module |
Channel-to-Channel Isolation & DCS Process Telemetry
The 2MLI-D22A incorporates optocoupler isolation circuits between field wiring terminals and backplane logic interfaces. This structural channel-to-channel isolation barrier isolates 24 VDC field instrument signals from the backplane CPU data paths, preventing ground loop currents and high-voltage field spikes from corrupting digital state memory. Electrical separation across field-side logic circuits ensures interference-free processing alongside 4-20 mA HART loop protocol transmitters and analog instrumentation connected to adjacent DCS cards.
Frequently Asked Questions
Q: Does the 2MLI-D22A support both sinking and sourcing field input connections?
A: Yes, internal circuitry supports both sink and source wiring topologies by alternating the common terminal return path to 0 VDC or 24 VDC according to field sensor specifications.
Q: Is hot-swapping supported for the 2MLI-D22A while the rack is under power?
A: De-energize the base rack chassis power supply before inserting or removing the 2MLI-D22A module to prevent electrical arcing across backplane pins and memory parity faults in the CPU.
Field Installation Guidelines
- Isolate main power feeds to the base rack chassis and external 24 VDC field loops prior to module installation.
- Seat the 2MLI-D22A firmly into its designated backplane slot until the top and bottom locking levers snap into place.
- Wire field inputs using recommended copper wire gauges and verify correct polarity setup for sink or source configuration at the terminal block.
- Separate 24 VDC discrete signal wiring from AC power lines inside control raceways to avoid induced electromagnetic noise.
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.