DS200TCQBG2A | GE Mark VI I/O Board

Description

Product Introduction (Anti-Template)

The DS200TCQBG2A is the answer to a specific problem: you have a cluster of 10-16 sensors and actuators on a compact skid and you want to control them all from a single slot. This board packs 16 discrete inputs and 16 discrete outputs into one VME slot—double the I/O count of the TCQBG1 series, with solid-state outputs and comprehensive diagnostics.

The ‘2’ in the part number tells you this is the high-density variant in the TCQBG family. The ‘A’ suffix indicates solid-state outputs (MOSFET-based), diagnostic LEDs per channel, and a 5ms update rate. Compared to the TCQBG1B (8 inputs, 8 outputs, solid-state outputs), the TCQBG2A gives you twice the I/O with the same solid-state reliability and diagnostic features. If you have 10-16 sensors and actuators on a compact skid 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 I/O requirements.

✅ Drop-in Replacement: The DS200TCQBG2 (no ‘A’) is a direct drop-in with identical 16 inputs and 16 outputs, but without the enhanced features. The ‘A’ revision adds solid-state outputs, diagnostic LEDs, and 5ms update rate. If you don’t need these features, the base model is a cheaper option (typically 20-30% less). The ‘A’ is the enhanced version.

⚠️ Software Compatible: The DS200TCQBG1B (8 inputs, 8 outputs, solid-state outputs) fits the rack but has half the I/O count. If you swap a TCQBG2A for a TCQBG1B, you’ll lose channels 9-16 on both inputs and outputs. This is a downgrade, not an upgrade.

⚠️ Software Compatible: The DS200TCQAF1B (16 inputs only) provides inputs only—no outputs. Only use if you don’t need outputs.

⚠️ Software Compatible: The DS200TCQBF1B (16 outputs only) provides outputs only—no inputs. Only use if you don’t need inputs.

❌ Hardware Incompatible: Any analog I/O board (TCCAG1 series) uses different backplane pins and is not suitable for discrete signals.

Frequently Asked Questions (FAQ)

What’s the difference between the TCQBG2A and the TCQBG1B?

The TCQBG1B is a lower-density board: 8 inputs, 8 outputs, solid-state outputs, reinforced isolation, enhanced EMC. The TCQBG2A is a high-density board: 16 inputs, 16 outputs, solid-state outputs, standard isolation. The trade-off is: double the I/O with slightly lower output current rating (1.5A vs. 2A) and standard isolation.

Why does this board have a lower output current rating?

The TCQBG2A has 16 solid-state outputs—double the channel count of the TCQBG1B. To fit 16 outputs in the same VME footprint, the output drivers are rated for 1.5A continuous (vs. 2A on the TCQBG1B). This is sufficient for most discrete loads (solenoids, contactors, pilot relays) but may not be suitable for high-current loads. If you need 2A outputs, consider the TCQBG1B.

Can I use this board with a Mark VIe controller?

No—the TCQBG2A uses the older Mark VI backplane pinout. Mark VIe uses a different assignment and typically uses the IS200TCQBG2A for high-density discrete I/O. Use the Mark VIe-specific board for new installations.

How do I test this board before installation?

Testing the TCQBG2A requires checking all 32 channels (16 inputs, 16 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. Input test: Apply 24V DC to input 1—LED should illuminate green. Remove voltage—LED should turn amber (OFF). Repeat for inputs 1-16.
5. 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 1-16.
6. Isolation test: Apply 1500Vrms between an input channel and ground for 1 minute.

What’s the most common failure on this board?

Two issues specific to the high-density design:

1. Output MOSFET failure. Solid-state outputs can fail if subjected to voltage transients or excessive current. The 1.5A rating is lower than the TCQBG1B’s 2A—be careful not to exceed it.
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 I/O and 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
• Input 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 TCQBG2A?

These boards are less common than the TCQBG1B:

• New surplus: 4-8 weeks.
• Refurbished: 2-4 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 IS200TCQBG2A (Mark VIe version). The backplane pinout is different.

What termination board should I use with the TCQBG2A?

The TCQBG2A is designed to interface with a termination board that supports both discrete inputs and outputs. The DS200TBPXG2A (high-density mixed-signal termination) or DS200TBAAG2A (high-density discrete input termination) can be used for the inputs, but for the outputs you need a termination board with appropriate terminals. For best results with solid-state outputs, use shielded wiring and follow the grounding instructions in the GE manual.

What’s the update rate for this board?

The TCQBG2A 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 1.5A at 24, 48, or 125 VDC. For inductive loads (solenoids, contactors), use an external snubber circuit to protect the output. The lower current rating (1.5A vs. 2A on the TCQBG1B) is the trade-off for the higher channel density. If your load exceeds 1.5A, consider the TCQBG1B or add an external relay.

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