DS200ADGIG1AAA | GE Mark V Board | Analog I/O

Description

Product Introduction

The GE DS200ADGIG1AAA is a general-purpose analog interface board for the Mark V Speedtronic turbine control system. It provides 8 analog inputs and 4 analog outputs in a single VME slot. This module serves as a lower-cost alternative to the ADCIH series for applications with modest I/O counts.

Core advantage: The G1AAA revision offers the most basic analog I/O configuration in the Mark V lineup. It is physically and electrically compatible with older ADGI boards but uses updated components with better availability. Field data shows this board has the lowest failure rate among Mark V analog modules (0.8% per year) because of its simpler design – fewer channels, no per-channel isolation, no complex filters. For non-critical I/O such as ambient temperature, barometric pressure, or backup monitoring, this board delivers reliable service at lower cost than high-density alternatives.

Key Technical Specifications

Key Selling Points & Differentials

• Lowest failure rate in Mark V lineup – Simple design with 12 channels total (8 in, 4 out). Fewer components than ADCIH (24 channels) or ADCIG (12 channels with isolation). Field return rate is 0.8% per year vs 2.5% for ADCIH.
• Lower cost – Typically 30-40% less than ADCIH1A and 50-60% less than ADCIG1ADB. For non-critical I/O, the cost savings are justified.
• Lower power draw – 380 mA vs 580-720 mA on other analog boards. Leaves more 5 V budget for CPU and comms modules.
• Drop-in replacement for older ADGI boards – Identical pinout and software mapping. Replace failed ADGI (discontinued) with ADGIG1AAA directly.
• Live tested with full channel scan – Each board runs 2-hour test with all 8 inputs and 4 outputs. We inject 0 V, 5 V, and 10 V on inputs. Outputs drive resistive loads.
• 30-day warranty with cross-ship – Channel failure or drift? We send replacement same day.

Frequently Asked Questions (FAQ)

Q: What is the difference between DS200ADGIG1AAA and DS200ADCIH1A?
A: Channel count and cost. ADGIG1AAA: 8 inputs, 4 outputs, 380 mA, lower cost. ADCIH1A: 16 inputs, 8 outputs, 635 mA, higher cost. Choose ADGIG when you have fewer than 8 analog inputs and 4 outputs per rack. Choose ADCIH when you need high density to save slots. Performance (12-bit, accuracy) is identical.

Q: Can I replace a failed ADCIH1A with an ADGIG1AAA in the same slot?
A: Yes, electrically – but you will lose 8 inputs and 4 outputs. The Mark V controller will see the board as a different type and may log configuration errors. You must reconfigure the I/O map in Toolbox to remove the missing channels. Takes 20 minutes. For temporary replacement during troubleshooting, it works. For permanent replacement, we recommend matching the original board type.

Q: How do you test the ADGIG1AAA on refurbished boards?
A: We use a test fixture with 8 precision voltage sources and 4 electronic loads. The test script cycles each input through 0.000 V, 2.500 V, 5.000 V, 7.500 V, and 10.000 V. Outputs drive the same sequence. Pass/fail thresholds: inputs ±0.02 V, outputs ±0.03 V. Any channel outside these limits fails. About 8% of incoming ADGIG boards fail – usually due to damaged input mux or output DAC.

Q: My ADGIG board reads correctly but outputs have 0.2 V offset. Is this normal?
A: Yes – the output offset spec for ADGIG is ±0.2 V at 0 V command. The 12-bit DAC has a zero-scale error. For applications requiring true zero, you have two options: (1) add a -0.2 V bias in software, or (2) use an ADCIG series board with 14-bit outputs (0.05 V offset). The ADGIG is not intended for precision low-voltage control.

Q: Is the ADGIG1AAA compatible with 4–20 mA loops?
A: Yes – add external 250 Ω precision resistors (0.1%) across each input or output. The output in current mode provides internal 24 V loop power. Maximum loop resistance is 500 Ω. For longer loops, use an external 24 V supply (cut the internal jumper). We can pre-configure boards for external supply upon request.

Q: Can this board be used for thermocouple inputs?
A: No – same as all Mark V analog modules. No cold junction compensation. Use a DS200TCT thermocouple conditioner board, then feed its 0–10 V output into the ADGIG input. Direct thermocouple connection gives meaningless readings.

Q: How do I identify a counterfeit DS200ADGIG1AAA?
A: Genuine boards have a white GE barcode label with “ADGIG1AAA” printed. The PCB has “GE” silk-screened in the lower right corner. Counterfeits often miss the GE logo. Also check the DAC chip: genuine uses AD5328 (Analog Devices). Fakes use unmarked chips. The ADGIG is less commonly counterfeited than ADCIH boards because it is lower volume. Still, inspect before installing.

Q: What is the update rate for all 8 inputs?
A: 80 ms total (10 ms per channel sequential). Outputs update individually when the VME bus writes new values – typical latency is 5 ms per channel. For closed-loop control, the effective rate is limited by the input scan (12.5 Hz). Acceptable for slow processes like tank level or temperature. Not acceptable for fuel valve control (use ADCIG1ADB).

Q: I see an ADGIG board with a purple dot near the terminal block. What does that mean?
A: The purple dot indicates the board received an additional “burn-in” test at 55°C for 48 hours. Standard boards get 24 hours. Purple-dot boards are intended for critical spares or high-reliability sites. We charge an extra $20 for purple-dot boards if available. Most applications do not need extended burn-in.

Q: Do you offer a conformal coated version of the ADGIG1AAA?
A: Yes – we can special-order the ADGIG1ACC (silicone coated) or ADGIG1ABB (acrylic coated). Lead time is 10-14 days. ACC adds 75, ABB adds 45. For coastal or chemical sites, we recommend ABB (acrylic). The ADGIG runs cooler than ADCIH boards, so coating does not cause overheating issues. We stock standard uncoated for immediate shipment.

Q: Can I hot-swap this board?
A: No – Mark V backplane does not support hot-swap for any analog I/O board. Power down the rack before removal or insertion. Hot-swap can damage the output drivers and cause unpredictable output states. We have seen ADGIG boards latch outputs to 10 V after hot-swap. Power down.

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