Honeywell 2MLF-AV8A MasterLogic Analog Input Module

Description

Engineered for high-density voltage acquisition within the Honeywell MasterLogic PLC platform, the Honeywell 2MLF-AV8A analog input module provides robust signal processing for industrial automation environments. This module interfaces seamlessly with field-level voltage instrumentation, converting analog signals into highly precise digital registers for the controller. With its high-speed conversions and dense channel packaging, it is ideal for systems demanding fast response times and compact panel space.

Features

• 8 Voltage Input Channels: High-density processing in a single module footprint to minimize rack space.
• Fast Conversion Speed: Achieves a digital conversion rate of 250 microseconds per channel.
• Electrical Protection: Photo-coupler isolation between input terminals and PLC power supply protects sensitive control logic.
• Flexible Addressing: Supports both fixed I/O mapping (64 points) and variable mapping (16 points) to optimize backplane data exchange.
• Secure Field Wiring: Equipped with an 18-point detachable terminal block for straightforward field maintenance.

Applications

• Power plant auxiliary process monitoring
• Water and wastewater flow and pressure telemetry
• Factory automation assembly and testing lines
• Oil and gas storage tank level monitoring

Technical Specifications

Empirical Engineering Insights

Alternative Models & Compatibility

The 2MLF-AV8A is specifically designed for voltage signals. If your field loops utilize 4-20mA or 0-20mA current signals, you must use the 2MLF-AC8A current input module instead. Using inline shunt resistors on the 2MLF-AV8A to measure current signals is not recommended as it bypasses the design specifications and degrades overall loop accuracy.

Application Pitfalls & Engineering Notes

Note that while there is strong photo-coupler isolation between the field terminals and the PLC backplane, there is no isolation between individual channels. If your analog inputs come from different physical locations with different ground potentials, you will experience ground loops. These loops will corrupt your measurement data and potentially damage the module. Use external signal isolators for loops with distinct ground potentials.

Commissioning & Wiring Tips

To minimize high-frequency noise from nearby variable frequency drives (VFDs) or motor contactors, always run analog input cables inside dedicated, grounded metal conduits separated from high-voltage AC cables. Connect the cable shield to the cabinet’s single-point ground system on the PLC end only, leaving the field end ungrounded to prevent circulating shield currents.

Installation Guidelines