Buyer’s Guide: Is the GE IC693MDL655 Right for Your Series 90-30 System?
When a Series 90-30 line goes down, every hour of downtime costs money. The GE IC693MDL655 is a high-density discrete input module that packs 32 input points into a single slot, making it a practical choice for panels where slot space is tight. This module was formerly manufactured by GE Fanuc and now falls under Emerson Automation. Before you buy, understand exactly what this module offers, what it needs, and how to plan around its discontinued lifecycle status.
What the Module Actually Does
The IC693MDL655 is a 24 VDC discrete input module for the Series 90-30 PLC platform. It provides Thirty-Two (32) input channels arranged in Four (4) groups of Eight (8) channels each. Each channel accepts On/Off devices such as limit switches, level switches, proximity switches, auxiliary contacts, and pushbuttons. The module supports Positive or Negative logic wiring, so it fits a range of field wiring conventions without extra hardware.
Key Specifications That Matter
The input voltage range spans 0-30 VDC, with a nominal input voltage of 24 VDC. The trigger voltage sits at 11.5-30 Volts, which means a channel registers as ON once the signal crosses that threshold. The On State Voltage is 11.5 – 30.0 VDC, while the Off state voltage is 0-5 VDC. Input current is 7 mA per channel, and the On state current is 3.2 mA with an Off state current of 1.1 mA. Response time is 2 ms on and 2 ms off, with a maximum On response time of 2 ms. The module draws 195 mA at 5VDC and 224 mA at 24 VDC from the backplane.
These numbers matter in practice. The 7 mA input current keeps field device loading low, which helps when you chain multiple switches. The 2 ms response time suits most machine control and interlock applications, though very high-speed registration tasks may need a faster module. The 11.5 VDC trigger point gives reasonable noise immunity on 24 VDC circuits.
Physical Layout and Connections
This module mounts directly into any available I/O slot on a 5-slot or 10-slot Series 90-30 baseplate. It occupies a single slot and works with CPU baseplates, I/O Expansion baseplates, and Remote I/O baseplates. It is compatible with both embedded 90-30 CPUs and modular 90-30 CPUs.
Connections use Two (2) male 24-pin connectors with ordering number Fujitsu FCN-365P024-AU, pre-mounted on the front panel. These interface to input groups A, B, C, and D. You will need pre-wired cables, which are sold separately. Compatible pre-wired cables are IC693CBL327 and IC693CBL328, though custom-built cables are also an option. LED status indicators are labelled A1-A8 (Group 1), B1-B8 (Group 2), C1-C8 (Group 3), and D1-D8 (Group 4), giving you fast per-point diagnostics.
Lifecycle Status: Read This Before Ordering
The IC693MDL655 is Discontinued/Obsolete. That does not mean you cannot find it, but it does mean availability depends on remaining stock and the secondary market. If you are maintaining an existing Series 90-30 installation, buying a tested spare now is far cheaper than scrambling after a failure. Contact SpareTechPLC to verify current availability and discuss replacement options before committing to a purchase.
Installation and Setup Guidance
Mount the module in any open I/O slot and secure it to the baseplate. Wire your field devices to the two 24-pin connectors using the compatible pre-wired cables or a custom cable built to your specification. Confirm your logic configuration (positive or negative) matches your field device wiring before powering up. Use the group LEDs to verify each channel after commissioning. Follow the manufacturer’s installation manual for all wiring and grounding details.
Maintenance and Reliability
Inspect the module and its connectors periodically for loose connections, dust buildup, and signs of heat stress. The LED indicators make it easy to spot a failed input channel during routine checks. Keep the panel environment within the conditions specified by the manufacturer. Because the module is discontinued, keeping one or two tested spares on the shelf is a smart reliability strategy for any critical Series 90-30 line.
What to Verify Before You Buy
Confirm your baseplate type and available slot. Check that your field devices operate within the 0-30 VDC range and that your wiring logic matches the module’s positive or negative logic capability. Verify you have the correct pre-wired cables (IC693CBL327 or IC693CBL328) or plan to build custom cables. Finally, confirm lifecycle status and stock with SpareTechPLC before ordering, since this module is discontinued.
