WATLOW MLS300-AIM,Analog Input Module (16-channel expansion),Discontinued

Watlow Anafaze MLS300-AIM is a 16-channel Analog Input Module designed as a high-density expansion unit for the MLS300 series.

It is the primary interface for collecting field sensor data to be processed by the system’s central CPU.

1. Introduction

The MLS300-AIM (Analog Input Module) is a critical expansion block within the modular MLS300 system.

Its primary role is to convert low-level analog signals from sensors into digital data for the MLS300-PM (Processor Module).

A single system can utilize multiple AIM units to scale up to 32 loops of control.

Though discontinued by Watlow, it remains widely used in legacy industrial stacks, often paired with the AIM-TB (Analog Input Terminal Board) for physical wiring.

2. Technical Parameter Table

3. Product Advantages and Features

High-Density Monitoring: Consolidates 16 high-precision analog inputs into a single modular slice, saving significant rail space.

Universal Input Support: Capable of handling a diverse range of sensors, from standard thermocouples to linear process signals like pressure or flow.

Differential Circuitry: Uses differential inputs to provide superior noise rejection, which is vital in high-interference industrial environments.

Plug-and-Play Integration: Designed to “stack” directly with other MLS300 modules via ribbon cables, requiring no complex field-level communication setup.

4. Application Cases

Semiconductor Tools: Precision monitoring of multi-zone heater plates where uniform temperature across a wafer is mandatory.

Plastic Extrusion: Aggregating data from multiple barrel and die-head thermocouples back to a central HMI.

Aerospace Curing: Managing 16 separate monitoring points in large autoclaves to ensure composite material integrity.

Food & Beverage: Multi-point temperature logging for industrial drying tunnels and ovens.

5. Other Models in the Same Series

MLS300-PM: Processor Module (The “Brain” that processes AIM data).

MLS300-CIM: Control Interface Module (Handles external communication).

AIM-TB: The physical Terminal Board specifically paired with the AIM module.

MLS316 / MLS332: Complete base units that often incorporate these modules.

MLS300-AIM

6. Installation and Maintenance

Installation

Stacking: Align the AIM module with the MLS300-PM and connect using the factory-supplied ribbon cable. Ensure the connectors are fully seated and locked.

Wiring: Sensors must be wired to the AIM-TB terminal board. For 4-20mA signals, ensure the 250$\Omega$ precision resistors are installed on the terminal block.

Shielding: Shielded cables are mandatory for thermocouple signals. Connect the shield at the terminal board end only to avoid ground loops.

Maintenance

Contact Cleaning: Over decades, the ribbon cable pins can oxidize. Periodically use a non-residue electronic contact cleaner to maintain signal integrity.

Failed Sensor Alarms: If the system displays “FS” (Failed Sensor) or “RT” (Reversed Thermocouple), check the terminal board connections first, as the AIM module is sensitive to loose wiring.

Refurbishment: Because it is discontinued, maintain a spare AIM module or utilize a professional repair service to recalibrate the A/D converters if readings begin to drift.

7. Unique Product Description

“The Watlow MLS300-AIM is the high-fidelity ear of your thermal system. By translating 16 channels of raw analog noise into digital precision, it provides the granularity required for world-class PID control. It is a legacy masterpiece of high-density engineering, proving that even in complex environments, accuracy does not have to be sacrificed for scale.”