Description

The General Electric IC697MDL253 is a high-performance 24-volt AC discrete input module designed specifically for the Series 90-70 programmable controller platform. This module provides 32 input points arranged in four isolated groups of eight points each, allowing each group to operate on a different phase of the AC supply system.

Engineered for industrial applications, the IC697MDL253 features a resistive input structure with current-voltage characteristics that comply with IEC Type 1 standards. It offers seamless compatibility with a wide range of control devices, including pushbuttons, limit switches, selector switches, and both two-wire and three-wire electronic proximity switches.

Integration is streamlined via LED status indicators located at the top of the module for rapid diagnostic viewing on the logic side. The unit utilizes a detachable field wiring terminal board and incorporates mechanical keying to prevent incorrect slot placement during maintenance or replacement procedures.

Features

32 Isolated Input Points: Organized into four independent groups of eight points each for multi-phase AC supply flexibility. Proximity Switch Compatible: Fully supports both two-wire and three-wire electronic proximity sensors. Built-in Filtering: Standard 20 ms input filter delay time to suppress electrical noise. Diagnostic LEDs: Logic-side ON-OFF status indicators for every individual input channel. Mechanical Slot Keying: Prevents inadvertent module substitution during field maintenance. Detachable Terminal Board: Simplifies wiring installation and replacement without disturbing field cables.

Applications

Discrete Industrial Automation: Monitoring machine status, panel pushbuttons, and limit switches. Multi-Phase AC Systems: Applications requiring isolated input groups tied to separate AC supply phases. Proximity Sensing Networks: Interfacing with 2-wire and 3-wire proximity detectors in harsh environments. Series 90-70 PLC Upgrades: Direct replacement or expansion for legacy General Electric rack-based control architectures.

Technical Specifications

Connections / Interfaces

Field Wiring Terminal Board: Detachable screw-clamp terminal block accepting wire sizes from #22 AWG (0.36 mm2) to #14 AWG (2.10 mm2). Power Supply Terminals: Separate power input terminals (10, 20, 30, 40) for each of the four isolated input groups. Backplane Connector: VME standard C.1 compliant interface for direct insertion into the Series 90-70 rack.

Installation Guidelines

Power Disconnection: Always remove system rack power before inserting or removing the module or detachable terminal board. Terminal Board Removal: Loosen the integrated module jackscrew counter-clockwise and swing the terminal board outward; do not pull directly on the hinged door. Ventilation Clearance: Ensure a minimum of 6 inches (152 mm) of clearance above and below the rack grill to maintain proper thermal airflow. Wire Bundling: Secure field wiring bundles using the cable tie cleat located at the lower corner of the terminal board to prevent strain on connections.