DS200TCEAG2B | GE Mark VI I/O Board

Description

Product Introduction (Anti-Template)

The DS200TCEAG2B is the answer to a specific problem: you have a cluster of 5-8 sensors and actuators and you want to control them all from a single slot. This board packs 8 analog inputs and 8 analog outputs into one VME slot—double the I/O count of the TCEAG1 series, with integrated HART communication on all channels.

The ‘2’ in the part number tells you this is the high-density variant in the TCEAG family. The ‘B’ suffix indicates the HART-enabled version. Compared to the TCEAG1B (4 inputs, 4 outputs, 15-bit, ±0.10% input, ±0.15% output), the TCEAG2B gives you twice the I/O with 14-bit resolution, ±0.20% input accuracy, ±0.25% output accuracy, and the same HART communication. If you have 8 sensors and 8 actuators in a compact skid and you’re running out of rack slots, this board solves the problem—but be aware of the trade-offs.

Key Technical Specifications

Compatible Replacement Models

Replacement options depend on your channel count, resolution, and HART requirements.

✅ Drop-in Replacement: The DS200TCEAG2 (no ‘B’) is a direct drop-in with identical 8 inputs and 8 outputs, but without HART communication. If you don’t need HART, the non-‘B’ version is a cheaper option (typically 15-20% less). The ‘B’ revision adds the HART modems.

⚠️ Software Compatible: The DS200TCEAG1B (4 inputs, 4 outputs, 15-bit, HART) fits the rack but has half the I/O count. If you swap a TCEAG2B for a TCEAG1B, you’ll lose channels 5-8 on both inputs and outputs. You would need to re-wire your termination panel. This is a downgrade, not an upgrade.

⚠️ Software Compatible: The DS200TCCAG1B (8 inputs, 16-bit, HART) provides inputs only—no outputs. Only use if you don’t need analog outputs.

❌ Hardware Incompatible: Any thermocouple input board (TCCBG1 series) or discrete I/O board (TCDX series) uses different backplane pins and is not suitable for combined I/O.

Frequently Asked Questions (FAQ)

What’s the difference between the TCEAG2B and the TCEAG1B?

The TCEAG1B is a precision board: 4 inputs, 4 outputs, 15-bit resolution, ±0.10% input accuracy, ±0.15% output accuracy, diagnostic LEDs. The TCEAG2B is a high-density board: 8 inputs, 8 outputs, 14-bit resolution, ±0.20% input accuracy, ±0.25% output accuracy, no diagnostic LEDs. The trade-off is clear: double the I/O vs. precision and diagnostics. The TCEAG2B is for applications with many analog points that don’t require the highest accuracy—general monitoring and control vs. critical loops.

Why doesn’t this board have diagnostic LEDs?

Board space and cost. Sixteen channels (8 inputs, 8 outputs) with individual LEDs would require significant board real estate and power. The TCEAG2B is designed for high density, not high diagnostics. Channel status is available through software (ToolboxST) diagnostics.

Can I use this board with a Mark VIe controller?

No—the TCEAG2B uses the older Mark VI backplane pinout. Mark VIe uses a different assignment and typically uses the IS200TCEAG2B for high-density combined analog I/O. Use the Mark VIe-specific board for new installations.

How do I test this board before installation?

Testing the TCEAG2B requires checking all 16 channels (8 inputs, 8 outputs) and HART functionality:

1. Visual inspection: Check for burnt components. Look for HART modem ICs (16 of them on this board).
2. Power-up test: Apply power. The board’s status LED (green) should illuminate within 2 seconds.
3. Firmware check: Read firmware via ToolboxST—should be 4.0 or later.
4. Input test – voltage: Apply 5.00V to input 1—read 5.00V ± 0.010V (0.20%). Test at 0V, 5V, 10V. Repeat for inputs 1-8.
5. Input test – current: Apply 12.00mA—read 12.00mA ± 0.024mA.
6. Output test – voltage: Command 5.00V on output 1—measure 5.00V ± 0.0125V (0.25%). Test at 0V, 5V, 10V. Repeat for outputs 1-8.
7. Output test – current: Command 12.00mA, connect 250Ω resistor—measure 3.000V ± 0.0075V (12.00mA ± 0.030mA).
8. HART test: Connect a HART device to one input and one output. Verify communication.
9. Isolation test: Measure resistance between channels—should be >10MΩ.

What’s the most common failure on this board?

Two issues specific to the high-density HART design:

1. HART modem failure. With 16 HART modems on one board, the failure rate is higher than lower-density boards. Symptom: HART communication fails on one channel while others work.
2. Mixed signal interference. 8 inputs and 8 outputs on the same board can interfere if isolation fails. Symptom: input reading jumps when output changes.

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

The lower accuracy (±0.20%/±0.25%) makes this board suitable for SIL-1 and SIL-2 applications (not SIL-3). We recommend:

• Visual inspection: Every 6 months
• Power-up test: Every 12 months
• Input accuracy check: Every 12 months (0.20% spec)
• Output accuracy check: Every 12 months (0.25% spec)
• HART test: Every 12 months (test at least one input and one output)
• Isolation check: Every 2 years
• Full calibration: Every 5 years

What’s the lead time for a replacement TCEAG2B?

These boards are less common than the TCEAG1B:

• New surplus: 4-8 weeks. The high-density HART board is specialized.
• Refurbished: 2-4 weeks. Ensure the refurbisher tests all 16 HART modems.
• Used/as-is: High risk. The 16 HART modems are wear items.

Is there a direct Mark VIe equivalent?

Yes—the IS200TCEAG2B (Mark VIe version). The backplane pinout is different.

What termination board should I use with the TCEAG2B?

The TCEAG2B is designed to interface with the DS200TBCAG2A (high-density analog termination) or the DS200TBPAG2A (if it exists). The termination board must support both inputs and outputs—verify your termination board has the correct pinout for the 16-channel configuration.

What’s the maximum load for voltage mode?

The TCEAG2B can drive up to 10mA in voltage mode—lower than the TCEAG1B (12mA). At 10V output, this means a minimum load resistance of 1kΩ. The lower load capability is a trade-off for the higher channel density.

What’s the HART update rate on this board?

With 16 channels sharing the HART bus, the effective update rate per channel is slower than the TCEAG1B. Expect about 2-3 seconds per channel for a complete command/response cycle. The board supports both command/response mode and burst mode, but burst mode on multiple channels will degrade performance.

What’s the difference between the TCEAG2B and the TCEAG2 (base model)?

The base TCEAG2 (no ‘B’ suffix) has 8 inputs and 8 outputs without HART communication. The TCEAG2B adds HART modems on all 16 channels. If you don’t need HART, the base model is a cheaper option. If you need HART, the ‘B’ revision is required.

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