I/O modules

Product Overview

The GE IC693MDL646B discrete input module interfaces 12 field devices with the Series 90-30 programmable controller. This unit accepts 120 VAC signals from pushbuttons, limit switches, and proximity sensors. It provides optical isolation between the field wiring and the controller backplane. The module includes individual LED indicators for each input point to simplify field troubleshooting.

Technical Specifications

Input Circuit Design

Each input channel on the GE IC693MDL646B incorporates a full-wave rectifier for AC signal detection. The module filters and shapes incoming waveforms to prevent false triggering from electrical noise. Its 10 kΩ input impedance ensures compatibility with most industrial sensors. The circuit provides a typical current draw of 12 milliamperes at 120 VAC.

Isolation and Protection

Optical couplers provide 1,500 VAC isolation between the field inputs and the logic side. This protection prevents ground loops and transient surges from damaging the CPU. The module also includes built-in snubber networks for suppressing contact bounce effects. Consequently, this design enhances system reliability in electrically noisy environments.

Response Time Characteristics

The GE IC693MDL646B delivers a maximum ON and OFF response time of 15 milliseconds. This speed suits most discrete control applications without requiring high-speed counting. You can increase the response time using software filtering for extremely noisy installations. The module updates its input status table once each CPU scan cycle.

Physical Interface

The 18-point removable terminal block accepts solid or stranded wires from 14 to 22 AWG. You can disconnect the field wiring without removing the entire module from the rack. Twelve green LEDs display real-time status for each input channel individually. The housing carries clear labeling that identifies terminal assignments for each point number.

Power Consumption and Thermal Dissipation

This module draws only 30 milliamperes from the 5 VDC backplane supply. It dissipates approximately 1.5 watts of heat during normal operation. The unit achieves this low power consumption through efficient optocoupler and logic IC designs. Therefore, it generates minimal thermal load inside the control cabinet.

Installation and Compatibility

The GE IC693MDL646B installs into any standard Series 90-3 slot without special configuration. You can mix this module with analog and specialty modules in the same base. The CPU auto-configures the input mapping during power-up initialization. This plug-and-play approach reduces installation labor and eliminates manual dip-switch settings.

Details