GE IC693MDL940 Relay Output Module (N.O. contacts)

Description

In many industrial automation setups, controlling a mix of AC and DC loads from the same PLC rack creates wiring complexity, voltage incompatibility issues, or the need for multiple specialized output modules. Situations like retrofitting older equipment, integrating third-party devices, or handling diverse actuators—such as 24 VDC solenoids alongside 120 VAC motors—often force engineers to compromise on density or add external interposing relays, increasing panel space and potential failure points. The GE IC693MDL940 resolves this by providing 16 normally-open relay outputs in four isolated groups, each capable of switching loads from 5–30 VDC or 5–250 VAC (50/60 Hz) at up to 2 A per point. This dry-contact versatility eliminates the need for voltage-specific modules in mixed environments, while the group isolation allows different power sources per quartet without crosstalk. Engineers commonly reach for the GE IC693MDL940 in Series 90-30 systems where flexibility is key, such as expanding I/O for varied field devices or replacing aging solid-state outputs that can’t handle both AC and DC reliably. Its mechanical relays also provide true air-gap isolation, enhancing safety and noise immunity in process control applications demanding high reliability.

The GE IC693MDL940 serves as a relay output module in the GE Series 90-30 I/O architecture, slotting into any position on a 5- or 10-slot baseplate. It receives discrete commands from the PLC CPU via the backplane, energizing internal relays to close normally-open contacts for external loads. The four isolated groups each share a common but permit independent supply voltages, so one group might handle 24 VDC valves while another switches 240 VAC pumps. Field power is user-supplied directly to the loads—no backplane load voltage is switched—while the module draws low-power 24 VDC from the rack for coil excitation. On-board suppression (RC for AC, diode for DC) protects contacts from inductive spikes, and individual LEDs display output status for quick visual confirmation. Response time is typically 15 ms on/off, suitable for most sequencing tasks. Within the automation stack, the GE IC693MDL940 occupies the discrete output layer, translating logic-level decisions into physical switching for diverse actuators, and configures easily in tools like VersaPro or Proficy Machine Edition with no special protocols required.

Opting for the GE IC693MDL940 yields substantial advantages in deployment flexibility and long-term robustness. Engineered with mechanical relays, it handles both AC and DC loads without derating concerns common in triac-based modules, ensuring consistent switching performance across voltage types and reducing the risk of leakage current affecting sensitive devices. The isolated groups cut engineering overhead by simplifying wiring diagrams—no need for separate modules or external isolation barriers when mixing voltages in the same rack. Maintenance becomes more efficient thanks to audible relay feedback, visible LED status, and built-in suppression that extends contact life under inductive loading. In operational terms, the GE IC693MDL940 supports higher uptime in mixed-signal environments, as its dry contacts tolerate transients better than solid-state alternatives and allow easy integration of non-standard loads. Overall, it preserves investment in Series 90-30 platforms by delivering versatile, high-reliability outputs that adapt to evolving plant needs without complicating the control architecture.

The GE IC693MDL940 excels in scenarios demanding voltage-agnostic switching for diverse actuators. In manufacturing lines, it drives a combination of DC solenoids for pneumatic cylinders and AC contactors for conveyor motors, supporting fast changeovers and continuous production in electrically varied setups. Water and wastewater facilities deploy it for pump starters, valve actuators, and alarm beacons across harsh conditions, where group isolation ensures reliable operation despite differing power sources and contributes to critical system uptime. Pharmaceutical or food processing plants use it in process control environments for mixing low-voltage indicators with higher-voltage heaters or agitators, maintaining precise sequencing under strict regulatory demands. Throughout these industrial automation applications, the GE IC693MDL940 meets requirements for robust performance in noisy or multi-voltage settings with sustained operational demands.

Compatible or Alternative Products

IC693MDL930 – 8-point relay output variant for lower-density needs with similar isolation.

IC693MDL931 – 8-point isolated 4 A relay outputs for heavier individual loads.

IC693MDL330 – 8-point 120 VAC triac output module for AC-only applications.

IC693MDL340 – 16-point 120 VAC output for higher density AC switching.

IC693MDL341 – 16-point 24 VDC isolated output alternative for DC-focused setups.

IC693MDL760 – 8-point 24 VDC positive logic output with higher current for sourcing needs.

IC693MDL931 – Enhanced relay module with individual isolation per point.

Before adding the GE IC693MDL940, confirm available backplane slots and that the 24 VDC isolated bus has sufficient capacity for the additional 135 mA draw when all relays are energized. Verify external load supplies align with the 5–30 VDC or 5–250 VAC range, and plan suppression if loads exceed built-in protection ratings. Ensure panel airflow supports the 60 °C limit and secure the removable terminal block firmly to withstand vibration. After insertion, use configuration software to assign outputs and test each point individually during commissioning to catch wiring errors early. For maintenance, listen for relay operation during cycles, visually check LEDs against commanded states quarterly, and inspect contacts indirectly via load performance or continuity tests during outages. Annual functional verification against known loads helps identify wear before it impacts production.