GE IC693MDR390C Mixed 24 VDC Input / Relay Output I/O Module

Description

In compact machines where every rack slot has to pull double duty, the GE IC693MDR390C is at its best handling both sensor feedback and load switching in one mixed I/O module. It fits naturally into packaging machines that need to monitor photoeyes and limit switches while also driving small contactors, indicators, and solenoids from the same PLC drop. On OEM skids for compressors, pumps, or standalone process units, the GE IC693MDR390C lets designers terminate start/stop commands, pressure or level switches, and motor starter coils on a single card instead of dedicating separate input and output modules. This saves cabinet space, reduces wiring runs, and simplifies spares management—important for integrators supporting global fleets where standardization is critical.​

In material handling or conveyor cells, the mixed 8-in/8-out layout makes it easy to tie each sensor to its corresponding actuator, so installers can land field cables logically and technicians can trace faults quickly during troubleshooting. Small batch systems in water treatment, food processing, or specialty chemicals use the GE IC693MDR390C as a localized “island” of control, combining 24 VDC digital inputs from pushbuttons and proximity switches with relay outputs that can safely switch either DC loads or 120/240 VAC devices. The result is a compact, versatile module that supports practical control tasks without forcing a redesign of the whole Series 90‑30 rack architecture.​

Product Introduction & Positioning

The GE IC693MDR390C is a mixed digital input/output module for the GE Fanuc Series 90‑30 PLC platform, combining 24 VDC input channels with relay-based outputs on a single board. Functionally, it provides eight discrete DC inputs and eight normally open relay outputs, giving one slot the ability to both read field status and command external loads. Within a control system, it sits on the I/O baseplate alongside pure input or output cards, with its channels mapped into the PLC’s discrete input (%I) and output (%Q) memory areas just like dedicated modules.​

In architectural terms, the GE IC693MDR390C is often used at the “edge” of a system—close to where field cables enter the panel—so that local devices can be grouped and commissioned as a small, self-contained segment of logic. Because its relay outputs can switch both low‑voltage DC and higher AC voltages, it acts as a convenient interface between low‑level 24 VDC signal wiring and line-voltage loads, helping engineers avoid external interposing relays in many cases. For machine builders and retrofit specialists, this mixed module is particularly valuable when expanding existing Series 90‑30 racks in limited space while needing both inputs and outputs on the same node.​

Key Technical Features & Functional Benefits

The strength of the GE IC693MDR390C lies in its flexible front end and rugged back end: the 24 VDC inputs accept typical industrial sensor signals in the −30 to +30 VDC range, with input circuits designed to work with both sourcing and sinking field devices. That means proximity switches, pushbuttons, selector switches, and similar contacts can all be landed without exotic wiring schemes, which simplifies design and speeds up commissioning. On the output side, the integrated relays provide a switching capacity of up to 2 A per point, giving the module enough margin to drive motor starters, solenoid valves, stack lights, and other common loads directly.​

From a hardware perspective, the GE IC693MDR390C draws its internal relay power from the 24 VDC bus on the backplane and uses mechanical relay contacts for the outputs, which brings two advantages: true galvanic isolation between field circuits and a very broad allowable voltage range on the load side. Because the outputs are real relays rather than transistor drivers, a single module can serve both DC and AC loads within its specified range, making it ideal in mixed‑voltage panels or retrofit projects where field wiring and voltages may vary. Clear status LEDs across the top of the module provide per‑point indication, enabling technicians to check input and output states at a glance during startup and diagnostics.​

Compatibility and lifetime support are also important benefits. The GE IC693MDR390C installs into any I/O slot of a 5‑ or 10‑slot Series 90‑30 baseplate, so it can be integrated into existing systems with CPUs and power supplies already in service. Standard 20‑screw terminal blocks provide a familiar connection method for panel builders, with circuit identification printed on the inside surface and point labels on the outside for quick reference. Overall, the module’s relay isolation, wide voltage handling, and mixed I/O layout make it an efficient choice for long‑term operation in general‑purpose automation panels.

​

Detailed Technical Specifications

Related Modules or Compatible Units

IC693MDL645 – 24 VDC input module used when additional pure DC inputs are needed alongside the GE IC693MDR390C.
IC693MDL740 – 12/24 VDC transistor output module for higher‑density DC output applications that complement the GE IC693MDR390C relays.
IC693MDL930 – Eight‑point isolated relay output module for applications requiring only relay outputs with similar contact ratings.
IC693MDL240 – 120 VAC input module often paired with the GE IC693MDR390C in mixed AC/DC panels.
IC693MDL730 – High‑density DC output module used when additional purely digital outputs are required next to the GE IC693MDR390C.
IC693CPU374 – Series 90‑30 CPU commonly used in systems where the GE IC693MDR390C provides local mixed I/O near the controller.
IC693PWR331 – Power supply that provides the 5 VDC and 24 VDC backplane power consumed by the GE IC693MDR390C.​

Installation Notes & Maintenance Best Practices

When installing the GE IC693MDR390C, it is worth planning cabinet layout so that mixed I/O modules sit near field cable entry to minimize wire runs and ease segregation between low‑voltage signal wiring and higher‑voltage relay loads. Inputs should be wired with properly rated 24 VDC cabling, while relay outputs must use conductors sized for the expected current and voltage, with external fusing or breakers selected according to the load. Because the module’s relays can switch both DC and AC, keeping clear labeling on each output circuit is important to avoid miswiring during future modifications. Good practices include separating AC and DC load wiring in the duct, observing recommended torque on the 20‑screw terminals, and maintaining proper grounding and shielding for noise‑sensitive input lines.​

From a maintenance perspective, scheduled visual checks of the front‑panel LEDs and terminal integrity help catch issues early, especially in high‑vibration environments where screw connections may loosen over time. Periodic testing of relay outputs—either via the PLC’s forcing functions or a maintenance program—can verify that contacts still operate within expected timing and do not show signs of sticking or excessive wear. For systems switching inductive loads such as coils or solenoids, external suppression (diodes or RC snubbers, as appropriate to DC or AC) will extend relay life and reduce electrical noise on nearby inputs. Keeping detailed as‑built wiring diagrams aligned with the module’s internal and external labels simplifies fault‑finding and module replacement throughout the life of the installation.