DS200TVCOG1A | GE Mark VI I/O Board

Description

Product Introduction (Anti-Template)

The DS200TVCOG1A is a dedicated valve control board—the board that takes the controller’s valve position command and generates the analog output signal that positions the valve, while simultaneously reading the LVDT/RVDT position feedback to close the control loop. This board gives you one valve output with integrated position feedback processing in one VME slot.

The ‘TVCO’ in the part number indicates this is a valve control board. The ‘A’ revision adds diagnostic LEDs per channel, improved accuracy, and better noise filtering. Compared to using separate analog input (for LVDT feedback) and analog output (for valve command) boards, the TVCOG1A integrates both functions in a single slot, with better loop performance and diagnostics. If you need dedicated valve control with integrated feedback, this board is the solution.

Key Technical Specifications

Compatible Replacement Models

Replacement options depend on your need for integrated valve control.

✅ Drop-in Replacement: The DS200TVCOG1 (no ‘A’) is a direct electrical drop-in—same pinout, same 1 valve output, same 4 feedback inputs. The differences: the base model has no diagnostic LEDs, lower accuracy, and a slower update rate. If you don’t need diagnostics and your accuracy requirements are moderate, the base model is a cheaper option (typically 15-20% less). The ‘A’ is the enhanced version.

⚠️ Software Compatible: The DS200TCDAG1A (8 analog outputs) provides analog outputs only—no position feedback inputs. You would need a separate analog input board for LVDT feedback.

⚠️ Software Compatible: The DS200TCCAG1A (8 analog inputs) provides analog inputs only—no valve output. You would need a separate analog output board.

❌ Hardware Incompatible: Any discrete I/O board (TCQ series) uses different backplane pins and is not suitable for analog valve control.

Frequently Asked Questions (FAQ)

What’s the difference between the TVCOG1A and using separate analog I/O boards?

Using separate boards gives you more channels and flexibility. The TVCOG1A integrates the valve output and position feedback inputs in a single slot with a dedicated control loop. The advantage is better loop performance (faster response, better synchronization) and diagnostics specific to valve control. The TVCOG1A also has a dedicated PID loop implemented in hardware for faster response.

How many valve outputs does this board have?

The TVCOG1A has 1 valve output. The 4 analog inputs are for position feedback (LVDT/RVDT) only—you typically use one or two of them for a single valve (main and redundant feedback). The board is designed for single-valve control applications.

Can I use this board with a Mark VIe controller?

No—the TVCOG1A uses the older Mark VI backplane pinout. Mark VIe uses a different assignment and typically uses the IS200TVCOG1A for valve control. Use the Mark VIe-specific board for new installations.

How do I test this board before installation?

Testing the TVCOG1A requires checking the valve output and feedback inputs:

1. Visual inspection: Check for burnt components. Look for diagnostic LEDs.
2. Power-up test: Apply power. All diagnostic LEDs should briefly flash during POST.
3. Firmware check: Read firmware via ToolboxST—should be 3.0 or later.
4. Feedback input test: Apply 5.00V to input 1—read 5.000V ± 0.0025V (0.05%). Test at 0V, 5V, 10V.
5. Valve output test: Command 5.00V—measure 5.000V ± 0.0025V. Test at 0V, 5V, 10V.
6. Diagnostic LED test: Disconnect a feedback signal—LED should flash amber or red.
7. Update rate test: Verify the board updates at 5ms intervals.
8. Isolation test: Measure resistance between channels—should be >10MΩ.

What’s the most common failure on this board?

Two issues specific to the valve control design:

1. Output driver failure. The valve output driver can fail if shorted to ground or voltage.
2. Diagnostic LED failure. The LEDs can fail after 10+ years—a failed LED doesn’t affect the output.

If I’m using this board in a SIL-rated safety application, what’s the recommended maintenance interval?

The valve control board is suitable for SIL-2 applications (not SIL-3). We recommend:

• Visual inspection: Every 6 months (check diagnostic LEDs)
• Power-up test: Every 12 months
• Feedback accuracy check: Every 12 months (0.05% spec)
• Valve output accuracy check: Every 12 months (0.05% spec)
• Isolation check: Every 2 years
• Full calibration: Every 5 years

What’s the lead time for a replacement TVCOG1A?

These boards are moderately available:

• New surplus: 2-4 weeks.
• Refurbished: 1-2 weeks. Ensure the refurbisher tests both outputs and inputs.
• Used/as-is: Available, but the output drivers are wear items.

Is there a direct Mark VIe equivalent?

Yes—the IS200TVCOG1A (Mark VIe version). The backplane pinout is different.

What termination board should I use with the TVCOG1A?

The TVCOG1A is designed to interface with the DS200TBCAG1A (general-purpose analog termination) or DS200TBPAG1A (mixed-signal termination). The termination board provides the terminal connections for the valve output and position feedback wiring.

What’s the update rate for this board?

The TVCOG1A updates all channels simultaneously at 5ms intervals—200Hz update rate.

What’s the maximum load for the valve output?

The valve output can drive up to 12mA in voltage mode or up to 750Ω in current mode. For inductive loads (valve actuators), use an external snubber circuit to protect the output. The diagnostic LEDs will indicate overload (red flashing) if the load exceeds the limit.

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