Honeywell 2MLF-DC8A Analog Output Module

Honeywell 2MLF-DC8A 8-Channel Current Output Module

Product Introduction

The 2MLF-DC8A is a current output analog module built for the Honeywell MasterLogic-200 programmable logic controller series. This module converts CPU commands into standard current loop signals for field actuators. Specifically, it drives control valves, variable frequency drives, positioners, and other current-operated devices.

Control engineers choose this module when a plant standardizes on 4-20mA loops. Furthermore, the 8-channel density saves rack space in large analog control systems. Meanwhile, per-channel range selection adds flexibility without extra hardware. Consequently, the 2MLF-DC8A suits both new installations and expansion projects on existing MasterLogic-200 racks.

Technical Specifications

The module provides eight independent current output channels in a single unit. Output range covers DC 4-20mA and DC 0-20mA, and users select the range through applicable program settings or parameters for each channel individually.

Core output parameters include:

• Output Channels: 8 channels

• Current Output Ranges: DC 4-20mA / DC 0-20mA

• Load Resistance: 550Ω or less

• Range Selection: Per-channel via program or parameters

The 550Ω load capacity supports long field wiring runs and devices with moderate input impedance. Besides, the current loop format resists electrical noise far better than voltage signals. Therefore, signal integrity holds up in electrically noisy plant environments.

Channel Configuration and Flexibility

Each channel configures independently, so one module can serve mixed actuator types. For instance, a valve positioner may use 4-20mA while a drive reference uses 0-20mA. Moreover, changing a range requires only a software setting rather than rewiring or module replacement.

This per-channel approach simplifies spare parts planning. Specifically, one part number covers multiple loop types, which reduces inventory costs. In addition, commissioning engineers can adjust ranges during startup without pulling new hardware.

Mechanical and Environmental Parameters

The 2MLF-DC8A mounts as a plug-in card within the MasterLogic-200 rack system. Its compact housing matches the other I/O modules in the series for uniform panel layout. Meanwhile, backplane power feeds the module, so no separate supply wiring is needed at the card.

The module operates within the standard ambient conditions of the MasterLogic-200 platform. Additionally, the analog output stages include protection against short circuits and overloads on the field side, which guards the card during wiring errors.

Installation Guide

First, power down the rack and verify that the backplane carries no voltage. Next, insert the 2MLF-DC8A into an available I/O slot and push until the connector seats fully. Then, tighten the retaining screws to secure the card against vibration.

After mounting, wire the field devices to the output terminals using shielded twisted-pair cable. Specifically, observe correct polarity on each current loop. Subsequently, assign the output range for every channel in the configuration software. Finally, apply a test value and measure the loop current with a meter to confirm calibration before startup.

Packaging List

• 1x Honeywell 2MLF-DC8A Analog Output Module

• 1x Anti-static protective bag

• 1x Individual cardboard box with shock-absorbing foam

FAQ

Q1: How many output channels does the 2MLF-DC8A offer?
A1: The module provides 8 independent current output channels, each configurable for DC 4-20mA or DC 0-20mA operation.

Q2: Can I set different output ranges on different channels?
A2: Yes, the output range is selectable per channel through applicable program settings or parameters, so one module serves mixed loop types.

Q3: What is the maximum load resistance for this module?
A3: Each channel supports a load resistance of 550Ω or less, which covers most valves, positioners, and drive reference inputs.

Q4: Does this module output voltage signals as well?
A4: No, the 2MLF-DC8A is a current output type only, providing DC 4-20mA and DC 0-20mA ranges.

Q5: How do you ship this product?
A5: We ship via Fedex, UPS, and DHL. Each unit travels in anti-static packaging inside a shock-absorbing box for safe delivery.