GE Fanuc Series 90-30 Transistor Output Module IC693MDL731

Product Overview

The IC693MDL731 is an 8-point Discrete Transistor Output Module developed by GE Fanuc (now Emerson Automation) for the Series 90-30 programmable logic controller system. Operating within a nominal output voltage range of 12 to 24V DC, this solid-state module is specifically engineered to provide high-capacity, fast-switching control for DC-powered field loads. It features a negative logic (sinking) polarity configuration, meaning it switches the ground side of the circuit to actuate connected devices. Built to handle heavy-duty industrial signaling, the module features a compact mechanical footprint with a net weight of approximately 0.30 kg (0.66 lbs), integrating smoothly into standard Series 90-30 baseplates.

Core Technical Advantages

• High Output Load Capacity: Delivers up to 2.0 Amps of continuous load current per individual point, allowing it to drive heavy DC solenoid valves, contactor coils, and visual indicators directly without interposing relays.
• Rapid Solid-State Switching: Features a highly responsive transistor execution core with a maximum response time of just 2 ms for both turn-on and turn-off cycles, ensuring precision timing in high-speed sequential processes.
• Efficient Power Consumption: Draws a minimal 55 mA from the local +5V DC backplane logic track, maximizing the remaining power budget for surrounding processing and communication modules inside the sub-rack.

Technical Specifications

Industrial Applications

• DC Actuator & Solenoid Activation: Controls high-current fluid or pneumatic control valves in packaging, processing, and assembly lines.
• Machine Automation Signaling: Transmits rapid, high-power control states to peripheral equipment, stack lights, and sirens across automated workstations.
• Remote Switching Racks: Serves as a reliable, wear-free digital output interface in distributed I/O cabinets managed by a centralized control center.
• Material Handling Sorting Systems: Drives high-speed pneumatic diverter gates and switching relays requiring millisecond response times.

Wiring & Installation

• Terminal Block Wiring Layout: Wire field components through the integrated 20-screw removable terminal block. Since this is a negative logic module, the output points sink current from the load back to the DC common rail.
• Critical Grounding Protocol: Connect all system ground conductors in a clean tree structure back to a central plant earth point. Use the shortest and largest wire gauges possible to minimize electrical noise interference.
• Shield Ground Integration: Utilize the module's integral aluminum baseplate for securing shield ground lines. Ensure separate shield ground connections are established if using CPU modules with external communications ports.
• Enclosure & Power Safety: Mount the module inside an industrial enclosure with an appropriate environmental IP/NEMA rating. Always isolate all field power sources and the PLC backplane prior to performing any hardware maintenance.

Engineering Advantages

• Elimination of Mechanical Contact Wear: The solid-state transistor switching layout eliminates the arc damage and physical degradation common to mechanical relays, ensuring an exceptionally long operational lifespan.
• Strict Logic State Thresholds: Features highly precise voltage parameters, maintaining a clear separation between active and inactive states to prevent false triggering from field noise or leakage current.
• Removable Terminal Convenience: The 20-screw terminal block can be detached as a single unit without disconnecting field wiring, simplifying module replacements and reducing downtime during retrofits.

Technical FAQs

Q1: What does "Negative Polarity" or "Sinking" mean for the wiring of this module?
A1: Sinking polarity means that when an output channel is activated, the internal transistor connects the output pin to the DC negative (-) common. Therefore, one side of your field load must be wired directly to the positive (+) DC supply rail, and the other side connects to the module terminal.

Q2: Can I exceed the 2.0 Amp limit on a channel if the other channels are not being used?
A2: No. The 2.0 Amp parameter is a hard electrical limit dictated by the continuous current rating of each individual transistor switch. Exceeding this value can overheat and destroy the internal solid-state components of that channel.

Q3: What should I check if a channel fails to turn off when the PLC logic goes low?
A3: If a transistor output has been subjected to a severe short-circuit or a high current spike without a fuse, it will typically fail in a permanently shorted (ON) state. Check the field wiring for short circuits and verify the current draw before installing a replacement module.