DS200TCDAG1ACA | 8-Ch Analog Output Board

Description

Product Introduction (Anti-Template)

The DS200TCDAG1ACA takes the analog output board to the next level, adding diagnostics that tell you—at a glance—whether your valve is actually receiving the signal you’re commanding. It’s one thing to command 12mA from the controller; it’s another thing to know that 12mA is actually reaching the valve actuator. The ‘ACA’ revision adds per-channel output status LEDs that indicate normal operation, overload, or open-circuit conditions.

The ‘ACA’ suffix tells you this is the diagnostic version: the ‘A’ is the base platform (isolated outputs), the ‘C’ indicates enhanced diagnostics and improved accuracy, and the ‘A’ is the production revision. Compared to the TCDAG1A (14-bit, ±0.15% accuracy), the ‘ACA’ gives you 15-bit effective resolution, ±0.1% accuracy, and the diagnostic LEDs—all while keeping the same 8 channels and per-channel isolation. The diagnostics are a significant upgrade for maintenance: you can see from across the control room if a channel is overloaded or open-circuit without opening ToolboxST. If you’re driving critical actuators and you want confidence that your command is reaching the field, this board delivers.

Key Technical Specifications

Compatible Replacement Models

Replacement options depend on your accuracy and diagnostic requirements.

✅ Drop-in Replacement: The DS200TCDAG1A (no ‘CA’) is a direct electrical drop-in—same pinout, same 8 channels, same output ranges, same isolation. The differences: the ‘A’ has 14-bit resolution, ±0.15% accuracy, and no diagnostic LEDs. If you don’t need diagnostics and your accuracy requirements are moderate, the ‘A’ is a cheaper option (typically 15-20% less). The ‘ACA’ is for critical applications where diagnostics matter.

✅ Drop-in Replacement: The DS200TCDAG1 (base model) is also electrically identical—12-bit resolution, ±0.25% accuracy, no isolation, no diagnostics. Only use in non-critical applications.

⚠️ Software Compatible: The DS200TCDAG1B (if available) may be a different firmware revision. Always verify firmware compatibility.

❌ Hardware Incompatible: The DS200TCDBG1A (thermocouple input board) uses a different pinout—not suitable for analog outputs.

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

Frequently Asked Questions (FAQ)

What does the ‘ACA’ suffix mean on this analog output board?

GE’s suffix coding for the TCDAG1 series: the ‘A’ is the base platform (isolated outputs, 14-bit). The ‘C’ indicates enhanced diagnostics (per-channel status LEDs) and improved accuracy (15-bit effective, ±0.1%). The final ‘A’ is the production revision. So ‘ACA’ is the diagnostic, high-accuracy version of the TCDAG1 platform—the board you choose when you need to know your command is actually reaching the field.

How do the diagnostic LEDs work on the ‘ACA’ revision?

Each of the 8 channels has a tri-color LED that provides real-time output status:

• Green: Normal operation—output is within spec, load is within range.
• Red (flashing): Overload or short circuit—output current exceeds the limit (typically 22mA or voltage load exceeds 10mA). The output may be limited or shut down depending on the configuration.
• Amber (flashing): Open circuit—no load detected (for current mode) or load resistance too high.
• Amber (solid): Output driver fault—hardware failure detected (requires board replacement).
• Off: Channel not configured or disabled.

The LEDs are visible from the front of the board without removing it from the rack. This feature saves significant troubleshooting time—you can identify a failed actuator or wiring issue at a glance.

What’s the difference between the ‘ACA’ and the ‘A’ in terms of accuracy?

• ‘A’ version: ±0.15% of full scale over 0-60°C.
• ‘ACA’ version: ±0.1% of full scale over 0-60°C.

The ‘ACA’ achieves this with a more stable voltage reference (±15ppm/°C vs. ±25ppm/°C) and oversampling the 14-bit DAC to get 15-bit effective resolution. The improved accuracy is noticeable when you’re driving critical valves that need precise positioning.

Can I use this board with a Mark VIe controller?

No—the TCDAG1ACA uses the older Mark VI backplane pinout. Mark VIe uses a different assignment and typically uses the IS200TCDAG1ACA for analog outputs. Use the Mark VIe-specific board for new installations.

How do I test this board before installation?

Testing the ‘ACA’ revision requires checking the diagnostic LEDs and accuracy:

1. Visual inspection: Check for burnt or discolored components. Look for the diagnostic LEDs—they should be clean and free of cracks. Check the output drivers and isolation transformers.
2. Power-up test: Install the board in a test rack and apply 24 VDC (backplane) and the external supply. The board’s status LED (green) should illuminate within 2 seconds. All 8 diagnostic LEDs should briefly flash during POST, then settle to green (if no load is connected, they may flash amber for open circuit).
3. Firmware check: Read the firmware version via ToolboxST—should be 3.0 or later.
4. Output test – voltage: Configure channel 1 for 0-10V. Command 5.00V. Measure the output—should be 5.000V ± 0.005V (0.1% of full scale). Repeat for channels 1-8. Test at 0V, 5V, and 10V.
5. Output test – current: Configure channel 1 for 4-20mA. Command 12.00mA. Connect a 250Ω resistor—measure 3.000V ± 0.003V (12.00mA ± 0.012mA). Repeat for all channels.
6. Diagnostic LED test: Disconnect the load from channel 1. The LED should turn amber (flashing) for open circuit. Connect a load within spec—the LED should return to green. Short the output—the LED should turn red (flashing).
7. Load test: Connect a 1kΩ load (voltage) or 500Ω load (current) and verify the output stays within spec.
8. Isolation test: Measure resistance between output channels—should be >10MΩ.

What’s the most common failure on the ‘ACA’ revision?

Two issues specific to the diagnostic board:

1. Diagnostic LED failure. The LEDs can fail after 10+ years—a failed LED doesn’t affect the output, but you lose the visual indication. The symptom: a channel’s LED is off or stuck in one color regardless of the actual output status.
2. Output driver failure. Same as the ‘A’ version—output drivers can fail if shorted to a high voltage. The diagnostic LEDs will indicate the fault (red or amber), making troubleshooting faster.

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

For SIL-2 and SIL-3 applications (IEC 61508), we recommend:

• Visual inspection: Every 3 months (check diagnostic LEDs for any red or amber indications)
• Power-up test: Every 6 months
• Output accuracy check: Every 6 months (0.1% spec)
• Diagnostic LED test: Every 12 months
• Load test: Every 12 months
• Isolation check: Every 2 years
• Full calibration: Every 5 years

The diagnostic LEDs make routine inspections faster—you can visually verify all channels are green without opening ToolboxST.

What’s the lead time for a replacement TCDAG1ACA?

These boards are less common than the ‘A’ version:

• New surplus: 3-6 weeks. The ‘ACA’ commands a premium—expect 15-20% above the TCDAG1A.
• Refurbished: 2-3 weeks. Ensure the refurbisher tests the diagnostic LEDs—some shops only test accuracy.
• Used/as-is: High risk. The LEDs and output drivers are wear items—used boards may have degraded diagnostics or failed channels.

Is there a direct Mark VIe equivalent?

Yes—the IS200TCDAG1ACA (Mark VIe version). The backplane pinout is different. If you’re migrating to Mark VIe, plan to replace all analog output boards as part of the rack conversion.

What termination board should I use with the TCDAG1ACA?

The TCDAG1ACA is designed to interface with the DS200TBCAG1A (general-purpose analog termination) or the DS200TBPAG1A (mixed-signal termination). The termination board provides the terminal connections for the field wiring. The diagnostic features of the TCDAG1ACA work independently of the termination board—the board monitors the output current and voltage internally.

What’s the maximum load for voltage mode?

In voltage mode (0-10V, ±10V), the TCDAG1ACA can drive a load of up to 10mA. At 10V output, this means a minimum load resistance of 1kΩ. If you need to drive a lower impedance load, you’ll need an external signal conditioner. The diagnostic LEDs will indicate overload (red) if the load exceeds 10mA.

What’s the update rate for this board?

The TCDAG1ACA updates all 8 channels simultaneously at 5ms intervals—200Hz update rate, same as the ‘A’ version. The output updates are glitch-free—the DACs are updated at zero-crossing points to avoid output spikes.

EPRO PR6424/109-100
EPRO PR6424/108-021
EPRO PR6424/108-100 DS200TCDAG1ACA | 8-Ch Analog Output Board