General Electric IC693MDL645 Series 90-30 24 Volt DC Positive/Negative Logic Input Module

Description

The General Electric IC693MDL645 is a 16-point, 24-volt DC positive/negative logic input module designed for integration within the Series 90-30 Programmable Logic Controller (PLC) platform. This module features input characteristics that accommodate a wide range of user-supplied field devices, including mechanical pushbuttons, limit switches, and electronic proximity sensors. Current flowing into an individual input point updates the corresponding logic state within the PLC input status table (%I).

Power for field input devices can be supplied via an external user source or through the isolated 24 VDC supply terminals (+24V OUT and 0V OUT) provided on compatible Series 90-30 power supply units. The unit mounts directly into any available I/O slot on a 5-slot or 10-slot baseplate in a Series 90-30 system, utilizing a blue color-coded door label to signify low-voltage operation.

Features

• Provides 16 discrete input points arranged in a single group with a common power input terminal.
• Supports both positive and negative logic input characteristics for flexible field device wiring.
• Features two horizontal rows of green LED indicators (16 total) located at the top of the module for real-time ON/OFF status monitoring of points A1-A8 and B1-B8.
• Includes a hinged door with a reversible insert for recording circuit identification and viewing internal wiring diagrams.
• Offers 1500 V isolation between the field side circuitry and the logic backplane.

Applications

• Discrete signal monitoring in industrial automation and process control systems.
• Interfacing with pushbuttons, selector switches, and limit switches on machinery control panels.
• Monitoring status signals from electronic proximity sensors and photoelectric detectors.
• Factory automation upgrades and maintenance replacements for legacy Series 90-30 PLC architectures.

Technical Specifications

Connections / Interfaces

• Field Terminals: Removable terminal block connections supporting field wiring points 1 through 20, including dedicated 24V OUT and 0V OUT power terminals.
• Backplane Connector: Standard Series 90-30 bus connector interface for direct plug-in installation into baseplate I/O slots.
• Status Indicators: 16 green LEDs configured in two rows (A1-A8 and B1-B8) to display individual point logic status.

Installation Guidelines

• Ensure all rack power is removed from the Series 90-30 baseplate before inserting or removing the module.
• Install the module into any available I/O slot of a standard 5-slot or 10-slot Series 90-30 baseplate.
• Verify field device polarity matches the chosen positive or negative logic configuration during wiring.
• Connect external field power to the appropriate input terminals or utilize the baseplate power supply output terminals while respecting current limitations.