GE IC693MDL655 Review: A High-Density 32-Channel 24VDC Input Module for Series 90-30 PLCs
The GE IC693MDL655 is a high-density discrete input module from the Series 90-30 platform, originally manufactured by GE Fanuc and now supported under Emerson Automation. This module provides thirty-two 24VDC input channels organized into four groups of eight. Engineers and system integrators will find this module suitable for monitoring a wide range of on/off devices, including limit switches, proximity sensors, pushbuttons, and auxiliary contacts.
One of the key features is its support for both positive and negative logic wiring configurations. This flexibility simplifies integration with existing field wiring schemes. The module accepts an input voltage range of 0 to 30 VDC with a nominal voltage of 24 VDC. Each channel draws 7 mA of input current at 24 VDC. The on-state voltage is 11.5 to 30 VDC, while the off-state voltage is 0 to 5 VDC, providing clear switching thresholds.
Technical Specifications and Performance
The IC693MDL655 offers a fast response time of 2 ms for both on and off transitions. Isolation between the field side and the logic side is rated at 1500 V, achieved through optocouplers on the module. The backplane current draw is 195 mA at 5 VDC and 224 mA at 24 VDC. These parameters ensure reliable operation in demanding industrial environments.
The module uses two male 24-pin connectors (Fujitsu FCN-365P024-AU) mounted on the front panel. These connectors interface with input groups A, B, C, and D. Users need pre-wired cables such as the IC693CBL327 or IC693CBL328, which are purchased separately. Alternatively, custom cables can be built to suit specific application requirements.
Compatibility and Installation
This module fits into any Series 90-30 baseplate, including CPU, I/O expansion, or remote I/O baseplates. It occupies a single slot in a 5-slot or 10-slot baseplate. The module is compatible with both embedded and modular 90-30 CPUs. LED indicators on the front panel provide clear status for each group (A1-A8, B1-B8, C1-C8, D1-D8), simplifying troubleshooting.
Typical applications include monitoring pushbuttons, limit switches, level switches, proximity switches, and other on/off devices. The 32 input points allow efficient use of rack space, making it a cost-effective choice for high-density I/O requirements.
Note: The product lifecycle status is listed as discontinued/obsolete. While the module may no longer be available new from the manufacturer, it remains a valuable option for maintenance and replacement in existing Series 90-30 systems. Users should verify availability with authorized distributors or consider compatible alternatives.
In summary, the GE IC693MDL655 is a reliable, high-density input module with fast response, flexible wiring, and robust isolation. Its 32-point design and compatibility with the Series 90-300 platform make it a practical choice for industrial automation projects requiring digital input monitoring.