WhatsApp: +86 16626708626
Email: 
Phone: +86 16626708626Description
3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Rated Voltage | 24 VDC, 120/240 VAC (nominal) |
| Operating Voltage | 5–30 VDC; 5–250 VAC, 50/60 Hz |
| Outputs per Module | 16 (four groups of 4) |
| Contact Type | Normally Open (Form A) |
| Isolation | 1500 V field-to-logic; 500 V between groups |
| Maximum Load | 2 A pilot duty per point; 4 A max per common |
| Minimum Load | 10 mA |
| Maximum Inrush | 5 A |
| On Response Time | 15 ms maximum |
| Off Response Time | 15 ms maximum |
| Backplane Current (5 V) | 7 mA (all outputs on) |
| Relay Power (24 V bus) | 135 mA (all outputs on) |
| LED Indicators | 16 green LEDs (A1–A8 / B1–B8) |
| Fusing | None (external fusing required) |
| 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 IC693MDL940L is a 16-point relay output module for the Series 90-30 PLC. It provides 16 normally-open (Form A) dry contacts rated 2 A pilot duty. The points are arranged in four isolated groups of four, each with its own common terminal. Maximum current per group is 4 A.
The module switches both AC (up to 250 V) and DC (up to 30 V) loads, making it suitable for motor starters, solenoids, indicators, and mixed-voltage applications. Power for the internal relay coils comes from the Series 90-30 +24 V relay bus; the user supplies the field power. Status LEDs on the faceplate show the commanded state of every channel. The IC693MDL940L is the L-revision of the standard MDL940 and remains a direct drop-in replacement for existing Series 90-30 systems.
IC693MDL940L
IC693MDL940L
IC693MDL940L
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No LEDs, no outputs | Backplane power or module seating | ❌ Low | Measure +5 V and +24 V relay bus; reseat module | Verify power supply rails before replacing |
| Individual output fails to close | Open field wiring, failed contact, or external fuse | ✅ High | Force output ON and measure continuity across contact; check load | Inspect wiring and fuse; force adjacent channel for comparison |
| Output sticks closed | Welded contact or wiring short | ✅ High | Force OFF and verify open circuit with meter | Isolate load; replace module if contact remains closed |
| Group of 4 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 |
| Relay chatter or intermittent operation | Low field voltage, inductive kick, or weak coil power | ✅ Medium | Measure coil voltage and field supply under load | Add suppression diodes/snubbers; ensure +24 V relay bus is solid |
| Short contact life | Exceeding current or switching inductive loads without suppression | ✅ Medium | Review load type and current vs. contact life table | Derate for inductive loads; install proper snubbers |
If contacts 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: What does the “L” suffix mean on IC693MDL940L? A: It identifies the hardware revision (Series L). Functional specifications are identical to the base IC693MDL940. Always match the revision if the original system documentation specifies it, but most installations accept any late revision.
Q: Is this module 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 long-term.
Q: Can the relays switch both AC and DC loads? A: Yes. Operating range is 5–250 VAC (50/60 Hz) and 5–30 VDC. Observe the contact life ratings for the specific voltage and load type (resistive vs. inductive).
Q: Are there internal fuses? A: No. Install external fusing sized for the load current and wire gauge to protect both the module and the field devices.
Q: How are the 16 points grouped? A: Four isolated groups of four points each. Each group has its own common terminal, so different voltages or polarities can be used on different groups if needed.
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 arcing and damage to the contacts or backplane.
Q: Why is New Surplus priced lower than original list? A: These are unused original modules from OEM or distributor surplus inventory. Each unit is visually inspected, powered on a genuine Series 90-30 rack, and verified for correct LED and contact operation under load before shipment. Test documentation is available on request.
