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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Rated Voltage | 12/24 VDC |
| Output Voltage Range | 12 to 24 VDC (+20 %, –15 %) |
| Outputs per Module | 16 (two groups of 8) |
| Logic Type | Positive logic (sourcing) |
| Isolation | 1500 V field-to-logic; 500 V between groups |
| Output Current | 0.5 A maximum per point; 2 A maximum per common |
| Inrush Current | 4.78 A for 10 ms |
| Output Voltage Drop | 1 V maximum |
| Off-state Leakage | 1 mA maximum |
| On Response Time | 2 ms maximum |
| Off Response Time | 2 ms maximum |
| Backplane Current | 110 mA (all outputs on) from +5 VDC |
| LED Indicators | 16 green LEDs (A1–A8 / B1–B8) |
| Fusing | None (external fusing recommended) |
| Terminal Block | 20-screw removable (included) |
| Mounting | Any I/O slot in 5- or 10-slot Series 90-30 baseplate |
4. Product Introduction
The GE Fanuc IC693MDL740 is a 16-point discrete output module for the Series 90-30 PLC. It provides positive-logic (sourcing) outputs rated 12/24 VDC at 0.5 A per point. The 16 points are divided into two isolated groups of eight, each with its own common terminal. Maximum current per group is 2 A.
The module sources current from the positive field supply to the load. It is compatible with motor starters, solenoids, indicators, and similar DC loads. Response times are 2 ms maximum on and off. Status LEDs on the faceplate show the commanded state of every channel. The module installs in any available I/O slot and remains a direct replacement for existing Series 90-30 systems that require sourcing DC outputs.
IC693MDL740
IC693MDL740
IC693MDL740
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No LEDs, outputs dead | Backplane power or module not seated | ❌ Low | Measure +5 VDC on backplane; reseat module | Verify power supply and contact before replacing |
| Individual output fails to energize load | Open field wiring, blown external fuse, or failed channel | ✅ High | Measure voltage at output terminal when forced ON; confirm load continuity | Check field wiring and fuse; force adjacent channel for comparison |
| Output stays ON when commanded OFF | Shorted output transistor or wiring short | ✅ High | Force OFF and measure residual voltage/current | Isolate load; replace module if channel remains shorted |
| Group of 8 points fails | Common terminal or group power issue | ✅ Medium | Verify field supply voltage at the group common | Check wiring and external supply for that group |
| Excessive voltage drop under load | Overloaded point or high contact resistance | ✅ Medium | Measure voltage drop across output while loaded at 0.5 A | Keep load ≤0.5 A per point and ≤2 A per group |
| Overheating or intermittent operation | Exceeding current rating or poor ventilation | ✅ Medium | Monitor temperature and current under worst-case load | Add external fusing; ensure free airflow around module |
If outputs continue to misbehave after these checks, photograph the LED faceplate, terminal wiring, and capture the PLC fault table before contacting technical support.
6. Frequently Asked Questions (FAQ)
Q: Is the IC693MDL740 still manufactured? A: No. The Series 90-30 platform is mature. Available units are New Surplus or tested refurbished stock. Keep spares if the system must remain in service for years.
Q: Is this a sourcing or sinking module? A: Positive logic / sourcing. The module supplies current from the positive field bus to the load. The load returns to the negative side of the field supply.
Q: What is the difference between IC693MDL740 and IC693MDL741? A: Both are 16-point 12/24 VDC modules rated 0.5 A per point. The MDL740 is positive logic (sourcing); the MDL741 is negative logic (sinking). Choose according to the required load wiring polarity.
Q: Are there internal fuses? A: No. The module has no on-board fuses. Install external fusing appropriate for the load current and wire size to protect both the module and the field devices.
Q: Can I exceed 0.5 A on a single point for short periods? A: Continuous rating is 0.5 A per point and 2 A per group. Inrush is rated 4.78 A for 10 ms. Sustained overloads will damage the output transistors.
Q: Does the terminal block come with the module? A: Yes. A 20-screw removable terminal block is included. Label and photograph the existing wiring before removal so the new block can be terminated identically.
Q: Can this module be hot-swapped? A: No. Remove field power and power down the rack (or the affected baseplate) before inserting or removing the module. Hot-swapping risks damage to the backplane and the output drivers.
Q: Why is New Surplus priced lower than original list? A: These are unused original modules from OEM or distributor surplus. Each unit is visually inspected, powered on a genuine Series 90-30 rack, and verified for correct LED and output response under load before shipment. Test records are available on request.
