IS200DAMAG1B GE | Mark VIe IS200 DAC Module New Surplus

Description

Product Introduction

The GE IS200DAMAG1B is a Mark VIe series analog output module designed to provide precise 4-20 mA control signals to field actuators, control valves, and positioners in gas and steam turbine applications. This I/O pack delivers 8 independently configurable output channels and serves as an alternative hardware revision to the G1A family with specific electrical characteristic differences. It is a direct replacement for earlier DAMA variants in existing Mark VIe cabinets.

What differentiates the G1B revision from the G1A is its revised output stage architecture, which provides higher load drive capability up to 850 Ω compared to the G1A’s 750 Ω limit. This extra headroom is critical in installations with long cable runs or high-impedance positioners where loop resistance exceeds typical values. The G1B also uses a different DAC reference circuit that some field service engineers prefer for specific positioner compatibility. In our experience, the G1B is the preferred choice in plants using older valve positioners with higher input impedance specifications.

Key Technical Specifications

Key Selling Points & Differentiators

• Extended load drive capability – handles up to 850 Ω loop impedance, compared to 750 Ω on G1A. Critical for long cable runs (400+ meters) and high-impedance positioners.
• 8 high-density analog outputs – reduces cabinet space compared to older 4-channel modules. Cuts I/O rack count by up to 50% in retrofit projects.
• 14-bit resolution with ±0.1% accuracy – provides precise valve positioning and actuator control for stable turbine operation.
• Rigorous live-fire testing – each unit undergoes a 48-hour burn-in with all 8 channels loaded at 75% span. We test each channel against a calibrated reference resistor and verify load drive to 850 Ω.
• Per-channel isolation at 500 V DC – eliminates ground loops and common-mode noise issues common in plants with floating grounds.
• 3-year warranty on the hardware – backed by our in-house repair depot with average 48-hour turnaround. Dedicated DAMA swap-pool ensures rapid replacement.

Frequently Asked Questions (FAQ)

Can I hot-swap this IS200DAMAG1B into a running Mark VIe system?

We strongly advise against it. The DAMA series has shown unpredictable behavior when inserted into a powered backplane. We have seen blown backplane fuses and, in one case, a controller watchdog reset that tripped a turbine. Schedule a controlled outage, de-energize the rack, and swap it during planned maintenance.

What is the difference between the IS200DAMAG1A and the IS200DAMAG1B?

The G1B has higher load drive capability (850 Ω vs. 750 Ω) and uses a different DAC reference circuit architecture. The G1B’s output stage is optimized for installations with longer cable runs and higher-impedance field devices. Accuracy specifications are similar, though the G1B has slightly higher drift over temperature. Choose the G1B for long cable runs; choose the G1A for tighter temperature stability.

I currently have an IS200DAMAG1A installed. Can I replace it with this G1B?

Physically, yes – same slot, same termination board. However, the G1B has different output drive characteristics. The controller should auto-detect the new module, but we recommend verifying your application configuration after installation. Some users report requiring a slight retuning of PID loops because the G1B’s output stage has a slightly different response characteristic. Plan for a 1-2 hour commissioning window.

What is the maximum cable length I can run with the G1B’s 850 Ω load capability?

With 18 AWG shielded twisted-pair cable (approximately 0.024 Ω per meter), you can run up to approximately 500 meters (1,640 feet) and still stay within the 850 Ω limit with a typical 250 Ω positioner input. Cable resistance at 500 meters is roughly 12 Ω per conductor, so total loop resistance including both conductors and the positioner would be 250 Ω + 24 Ω = 274 Ω, which is well within the 850 Ω limit. For longer runs, use 16 AWG cable. Send us your loop specs for verification.

How do I verify this is a genuine GE module?

We source exclusively from GE-authorized liquidations and maintain full traceability. Our verification includes OEM packaging inspection, serial number cross-check against GE records, and visual PCB inspection for GE-specific board markings. We also test the G1B’s higher load drive to 850 Ω – clones typically fail above 750 Ω. We photograph the PCB for your records upon request.

Will I lose my existing calibration data when I replace the module?

Yes – calibration constants reside in the module’s EEPROM, not in the controller. You will need to recalibrate each output channel against your field devices. Plan for 2-3 hours of commissioning time. We can pre-load your calibration constants if you send us your old module’s data file from ToolboxST.

What is the expected lifespan of this unit?

We see MTBF around 95,000 hours for the G1B revision. The extended load drive capability puts slightly more stress on the output stage. Recalibration every 12 months is essential. We have seen these units perform beyond 12 years with proper maintenance.

What happens if the module fails within the warranty period?

We cross-ship a tested replacement from our dedicated DAMA swap-pool the same business day. You return the failed unit within 15 days. Our repair depot has an average 48-hour turnaround. We test your repaired unit back to full G1B specification. You receive the same G1B revision – not a downgraded G1A.

Which termination board should I use with this module?

The IS200DAMAG1B mates with GE’s TS200DTA1 or TS200DTA2 termination boards. Do not use the older TS200DTA0 – it lacks proper shielding. Double-check ribbon cable orientation; pin 1 has a red stripe. We include a wiring diagram PDF with every order.

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