DS200TCQEG2A | GE Mark VI Output Board

Description

Product Introduction (Anti-Template)

The DS200TCQEG2A is the answer to a specific problem: you have many high-current loads to control and limited rack space. This board packs 32 discrete outputs into one VME slot—double the channel count of the TCQEG1A, with solid-state outputs that never wear out and diagnostic LEDs per channel.

The ‘2’ in the part number tells you this is the high-density variant in the TCQEG family. Compared to the TCQEG1A (16 outputs, 5A), the TCQEG2A gives you twice the channels with a lower current rating (2.5A) to manage thermal dissipation. If you have 20-32 high-current loads and you’re running out of rack slots, this board solves the problem.

Key Technical Specifications

Compatible Replacement Models

Replacement options depend on your channel count and current requirements.

✅ Drop-in Replacement: The DS200TCQEG2 (no ‘A’) is a direct drop-in with identical 32 outputs, but without diagnostic LEDs and with a slower update rate. If you don’t need diagnostics, the base model is a cheaper option (typically 20-30% less). The ‘A’ is the enhanced version.

⚠️ Software Compatible: The DS200TCQEG1A (16 outputs, 5A) provides half the channels with higher current capacity. Only use if you need 5A and can reduce channel count.

⚠️ Software Compatible: The DS200TCQBF1B (16 outputs, 2A) provides solid-state outputs with lower current capacity and half the channels.

❌ Hardware Incompatible: Any analog output board (TCDAG1 series) or discrete input board (TCQAF1 series) uses different backplane pins and is not suitable for outputs.

Frequently Asked Questions (FAQ)

What’s the difference between the TCQEG2A and the TCQEG1A?

The TCQEG1A has 16 outputs at 5A. The TCQEG2A has 32 outputs at 2.5A. The trade-off is double the channel count with half the current capacity per channel. The lower current rating is necessary to manage thermal dissipation in the same VME footprint.

Why does this board have a lower current rating?

The TCQEG2A has 32 solid-state outputs—double the channel count of the TCQEG1A. To fit 32 outputs in the same VME footprint while maintaining thermal management, the output drivers are rated for 2.5A continuous. This is sufficient for most discrete loads (solenoids, contactors, pilot relays) but may not be suitable for high-current applications. If you need 5A outputs, consider the TCQEG1A.

Can I use this board with a Mark VIe controller?

No—the TCQEG2A uses the older Mark VI backplane pinout. Mark VIe uses a different assignment and typically uses the IS200TCQEG2A for high-density high-current outputs. Use the Mark VIe-specific board for new installations.

How do I test this board before installation?

Testing the TCQEG2A requires checking all 32 outputs:

1. Visual inspection: Check for burnt components. Look for diagnostic LEDs and solid-state output components.
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. Output test: Command output 1 ON—LED should illuminate green. Measure output voltage—should match the applied load voltage. Command OFF—LED turns amber and output voltage should be 0V. Repeat for outputs 1-32.
5. Current test: Connect a 2.5A load and verify the output can sustain the current.
6. Update rate test: Verify the board updates at 5ms intervals.
7. Isolation test: Measure resistance between output channels—should be >10MΩ.

What’s the most common failure on this board?

Two issues specific to the high-density solid-state design:

1. Output MOSFET failure. Solid-state outputs can fail if subjected to voltage transients or excessive current. The 2.5A rating is the guideline—ensure your load doesn’t exceed this.
2. Diagnostic LED failure. The LEDs can fail after 10+ years.

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

The high-density solid-state outputs make this board suitable for SIL-1 and SIL-2 applications (not SIL-3). We recommend:

• Visual inspection: Every 6 months (check diagnostic LEDs)
• Power-up test: Every 12 months
• Output test: Every 12 months (verify solid-state output operation)
• Isolation check: Every 2 years
• Full calibration: Every 5 years

What’s the lead time for a replacement TCQEG2A?

These boards are less common than the TCQEG1A:

• New surplus: 3-6 weeks.
• Refurbished: 2-3 weeks. Ensure the refurbisher tests all 32 channels.
• Used/as-is: High risk—the solid-state outputs are wear items.

Is there a direct Mark VIe equivalent?

Yes—the IS200TCQEG2A (Mark VIe version). The backplane pinout is different.

What termination board should I use with the TCQEG2A?

The TCQEG2A is designed to interface with a termination board that supports high-density high-current discrete outputs. The DS200TBQAG2A (high-density high-current termination) or DS200TBPXG2A (high-density mixed-signal termination) can be used. The termination board provides the terminal connections for the field wiring.

What’s the update rate for this board?

The TCQEG2A updates all 32 channels simultaneously at 5ms intervals—200Hz update rate.

What’s the maximum load for the solid-state outputs?

The solid-state outputs are rated for 2.5A at 24, 48, or 125 VDC. For inductive loads (solenoids, contactors), use an external snubber circuit to protect the output. The lower current rating (2.5A vs. 5A on the TCQEG1A) is the trade-off for the higher channel density. If your load exceeds 2.5A, consider the TCQEG1A or add an external relay.

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