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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Rated Voltage | 240 VAC, 50/60 Hz |
| Input Voltage Range | 0 to 264 VAC, 50/60 Hz |
| Inputs per Module | 8 (each point has individual common) |
| Isolation | 1500 V RMS field-to-logic; 500 V RMS between inputs |
| Input Current | 15 mA typical at rated voltage |
| On-state Voltage | 148 to 264 VAC |
| Off-state Voltage | 0 to 40 VAC |
| On-state Current | 6 mA minimum |
| Off-state Current | 2.2 mA maximum |
| On Response Time | 30 ms maximum |
| Off Response Time | 45 ms maximum |
| Backplane Current | 60 mA (all inputs on) from +5 VDC |
| LED Indicators | 8 green LEDs (A1–A8) for point status |
| Terminal Block | 20-screw removable terminal block (included) |
| Mounting | Any I/O slot in 5- or 10-slot Series 90-30 baseplate |
4. Product Introduction
The GE Fanuc IC693MDL231 is an 8-point isolated discrete input module for the Series 90-30 PLC. It accepts 240 VAC field signals (0–264 VAC range) and provides full isolation between each input and the PLC logic side. Reactive RC input circuits filter noise while remaining compatible with pushbuttons, limit switches, and proximity sensors.
Each of the eight points has its own common terminal, giving true point-to-point isolation. The module draws only 60 mA from the backplane when all inputs are on and installs in any available I/O slot. Status LEDs on the faceplate show the real-time state of every channel. It remains a direct drop-in replacement for existing Series 90-30 systems still running 240 VAC field devices.
IC693MDL231
IC693MDL231
IC693MDL231
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No LEDs illuminated, inputs not seen | Backplane power or module not seated | ❌ Low | Measure +5 VDC at backplane; reseat module firmly | Verify power supply and slot contact before replacing |
| Individual LED stays off when field signal present | Open field wiring or failed input channel | ✅ High | Measure AC voltage at the input terminal pair; confirm >148 VAC | Check field device and wiring; swap with known-good channel if needed |
| Input reports ON with no field signal | Leakage current or wiring short | ✅ Medium | Disconnect field wire and re-check status bit | Verify off-state voltage <40 VAC; inspect for induced voltage |
| Slow or missed transitions | Response time limits or noisy signal | ✅ Medium | Scope or meter the field signal timing | Confirm signal stays within on/off thresholds long enough for 30/45 ms filters |
| Multiple channels fail together | Terminal block or common wiring issue | ✅ Medium | Inspect and reseat the removable terminal block | Clean contacts; replace terminal block if damaged |
| Isolation failure / ground fault trips | Damaged isolation barrier | ✅ High | Megger test field-to-logic isolation (should hold >1500 V) | Replace module; do not reinstall if isolation is compromised |
If the module continues to show incorrect status after the above checks, photograph the faceplate LEDs, terminal wiring, and capture the PLC fault table, then contact technical support.
6. Frequently Asked Questions (FAQ)
Q: Is the IC693MDL231 still manufactured or is it obsolete? A: The Series 90-30 platform is mature. New production has stopped. Available units are New Surplus or carefully tested refurbished stock. Keep spare modules if the system is expected to run for years.
Q: Can I use this module with DC field devices? A: No. The IC693MDL231 is designed strictly for AC signals. Applying DC voltage will not produce reliable on/off thresholds and can damage the input circuits.
Q: How is the isolation arranged? A: Each of the eight points has its own isolated common. Field-to-logic isolation is rated 1500 V RMS; point-to-point isolation is 500 V RMS. This allows different phases or grounds on individual channels without cross-talk.
Q: What is the difference between IC693MDL231 and IC693MDL230? A: The MDL230 is the 120 VAC isolated version (on-state 74–132 VAC). The MDL231 is the 240 VAC version (on-state 148–264 VAC). Wiring and point count are identical; only the voltage thresholds differ.
Q: Does the terminal block come with the module? A: Yes. A 20-screw removable terminal block is included. Always label and photograph the existing wiring before removing the old module so the new block can be wired identically.
Q: Can this module be hot-swapped? A: No. Power down the rack or at least remove field power before inserting or removing the module. Hot-swapping high-voltage AC modules risks arc damage and personnel hazard.
Q: Why is New Surplus priced lower than original list price? 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 status-bit response before shipment. Full test records are available on request.
