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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Brand | GE (General Electric) |
| Series | Mark VI Speedtronic / IS200 |
| Model Number | 1C3600LLEAIC |
| Product Type | I/O Interface Board (Termination / I/O Pack) |
| Power Supply | 24V DC from backplane or external field supply |
| I/O Channels | Configurable (digital and analog combinations typical) |
| Isolation | Channel-to-channel: 1500V AC min, Channel-to-backplane: 2500V AC |
| Communication | VME backplane (Mark VI proprietary) |
| Operating Temp | 0 to +50°C (32 to 122°F) |
| Storage Temp | -40 to +85°C (-40 to 185°F) |
| Humidity | 5% to 95% non-condensing |
| Dimensions | Standard Mark VI I/O pack (approx 6U x 160mm depth) |
| Connectors | 1 x 96-pin DIN (backplane), 1 x 50-pin field I/O header |
| Status LEDs | Power OK, Run, Fault, I/O channel status per bank |
| GE Part Family | IS200 (Mark VI) |
| Compliance | IEC 61131-2, ISA-88 |
4. Product Introduction
The GE 1C3600LLEAIC is an I/O interface board (I/O Pack) for the Mark VI Speedtronic turbine control system. This board mounts in the VME backplane of a Mark VI rack and provides field I/O termination for digital or analog signals — thermocouples, 4-20 mA transmitters, contact inputs, relay outputs, and LVDTs.
The 1C3600LLEAIC is part of the IS200 series, which includes processor, communication, and I/O boards for gas and steam turbines (Frame 5, 6, 7, 9 and steam turbines). Unlike universal I/O, this board is application-specific. The exact I/O count and type depend on which firmware and daughter cards are installed. We can verify your configuration before shipping.
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No LEDs lit on board | Backplane power missing or board not seated | ❌ Low (backplane issue likely) | Check 24V DC on backplane pins. Reseat board firmly. | Check rack power supply (PSSA or similar). Replace 1C3600 if power present but board dead. |
| Run LED off, Fault LED on | Firmware mismatch or hardware failure | ✅ High | Read Mark VI diagnostic buffer (ToolboxST). Look for I/O Pack fault codes. | Cycle power. If fault persists, replace board. Firmware must match system version. |
| Intermittent I/O readings (thermocouple or 4-20 mA) | Loose field wiring or board connector issue | ✅ Medium | Wiggle field wiring harness at the 50-pin connector. Watch I/O values in ToolboxST. | Retorque terminal screws. Replace board if connector pins are loose or corroded. |
| One I/O channel dead, others work | Channel-specific failure (opto-isolator or ADC) | ✅ High | Swap field wiring from dead channel to known-good channel. If signal follows, board is bad. | Replace board. Individual channels are not field-repairable. |
| All I/O channels read zero or max scale | Missing field power or common reference | ❌ Medium | Measure 24V field power at the I/O terminal block. Check common (return) connections. | Restore field power. The 1C3600 does not generate field power — external supply required. |
| Board randomly resets during turbine operation | Backplane noise or failing power supply | ❌ Low (PSU issue likely) | Monitor 24V backplane power with oscilloscope. Look for drops below 18V. | Replace rack power supply (TCPS or NPSR series) before replacing I/O board. |
| Communication timeout in ToolboxST | Board address conflict or backplane failure | ✅ Medium | Verify board address switches (if present). Compare to rack configuration. | Replace board if address correct but no communication. |
| Turbine trips with “I/O Loss” alarm | Entire I/O pack failed or disconnected | ✅ High | Check physical connection. Reseat board. Cycle rack power. | Replace board if reseating doesn’t work. Keep spare on hand for critical turbines. |
Tech Note: The 1C3600LLEAIC is a dense, multi-layer board. Electrolytic capacitors on the power input section dry out after 15–20 years. If your Mark VI is original from the early 2000s, proactive replacement is cheaper than an unplanned turbine trip.
- 1C3600LLEAIC
6. Frequently Asked Questions (FAQ)
Q: What exact I/O configuration does the 1C3600LLEAIC have?
A: We need your specific board revision and any daughter cards to answer definitively. The base 1C3600LLEAIC typically includes:
- 16 digital inputs (24V DC, sink/source configurable)
- 16 digital outputs (relay or 24V DC transistor)
- 8 analog inputs (configurable for 4-20 mA, 0-10V, or thermocouple)
- 4 analog outputs (4-20 mA or 0-10V)
But this varies. GE shipped these boards with different stuffing options. The only way to know your exact configuration is to look at the board labels and any plugged-in mezzanine cards. Send us photos — we’ll identify it.
Q: Is the 1C3600LLEAIC compatible with Mark VIe systems?
A: No. Mark VIe uses a different backplane (PCI Express vs. VME) and different I/O packs (IS210 series). This board is for original Mark VI only. Installing it in a Mark VIe rack will not physically fit and will damage both the board and backplane.
Q: Can I replace my failed 1C3600LLEAIC with a different IS200 I/O pack?
A: Only if the replacement has identical I/O count and type. The Mark VI system checks I/O pack IDs during boot. If the replacement has different channel counts, the system will fault and won’t start. We can cross-reference your original board’s GE part number against our inventory. Do not assume compatibility.
Q: Why is this board so expensive if it’s obsolete?
A: Supply and demand. Thousands of Mark VI turbines still run worldwide. GE stopped making these boards around 2015. New surplus boards like this one are the only genuine OEM option. Refurbished boards exist but carry risk — we’ve seen refurbishers replace only visible caps while hidden failures remain. This is new old stock, never installed.
Q: What’s your testing process for this board?
A: We test every 1C3600LLEAIC on a live Mark VI test rack (software version 5.0 or 6.0 depending on your system). The test includes:
- Visual inspection for damage, corrosion, or rework
- Power-on self-test (LED sequence check)
- Backplane communication verification (ToolboxST sees the board)
- Digital I/O loopback test (each input toggled, each output driven)
- Analog I/O test (4-20 mA source and measure, 0-10V source and measure)
- 24-hour burn-in with thermal monitoring
Test video and report available upon request.
Q: My plant has a Mark VI with firmware version 4.5. Will this board work?
A: Possibly, but we need to verify. Mark VI firmware versions 4.x, 5.x, and 6.x have different I/O pack initialization sequences. The 1C3600LLEAIC was introduced during the 5.x era. It may work on 4.x with limitations, or may not boot at all. Tell us your exact firmware version (from ToolboxST → System → Versions) and we’ll check compatibility before you order.
Q: What’s the warranty on this obsolete board?
A: 1-year replacement warranty. Covers failure under normal operating conditions (0–50°C, correct backplane and field power). Does not cover damage from incorrect wiring, ESD, water ingress, or lightning strikes. We cross-ship replacements within 24 hours for confirmed defects.
Q: How do I safely remove and replace this board without damaging the backplane?
A: Mark VI backplanes use 96-pin DIN connectors with delicate pins. Procedure:
- Power down the entire rack (both control and field power).
- Wait 2 minutes for capacitors to discharge.
- Use the ejector levers (top and bottom) — never pull on the board itself.
- Pull the board straight out — no rocking or twisting.
- Insert the new board straight in, push evenly until ejectors latch.
- Power up rack and verify LEDs (Power OK, Run). Check ToolboxST for I/O Pack status.
