DS200TCQAG2B | 32-Ch Discrete I/O Board

Description

Product Introduction (Anti-Template)

The DS200TCQAG2B 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 TCQAG1 series, with solid-state outputs, reinforced isolation, and comprehensive diagnostics.

The ‘2’ in the part number tells you this is the high-density variant in the TCQAG family. The ‘B’ suffix indicates the enhanced version with solid-state outputs (MOSFET-based), reinforced isolation (1800Vrms), extended temperature range (-20°C to +70°C), enhanced EMC protection, and diagnostic LEDs per channel. Compared to the TCQAG1B (8 inputs, 8 outputs, solid-state outputs), the TCQAG2B 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 DS200TCQAG2 (no ‘B’) is a direct drop-in with identical 16 inputs and 16 outputs, but without the enhanced features. The ‘B’ revision adds solid-state outputs, reinforced isolation, extended temperature range, enhanced EMC protection, and diagnostic LEDs. If you don’t need these features, the base model is a cheaper option (typically 20-30% less). The ‘B’ is the enhanced version.

⚠️ Software Compatible: The DS200TCQAG1B (8 inputs, 8 outputs, solid-state outputs) fits the rack but has half the I/O count. If you swap a TCQAG2B for a TCQAG1B, 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 TCQAG2B and the TCQAG1B?

The TCQAG1B is a lower-density board: 8 inputs, 8 outputs, solid-state outputs, reinforced isolation, enhanced EMC. The TCQAG2B is a high-density board: 16 inputs, 16 outputs, solid-state outputs, reinforced isolation, enhanced EMC. The trade-off is: double the I/O with slightly lower output current rating (1.5A vs. 2A) due to the higher channel density.

Why does this board have a lower output current rating?

The TCQAG2B has 16 solid-state outputs—double the channel count of the TCQAG1B. To fit 16 outputs in the same VME footprint, the output drivers are rated for 1.5A continuous (vs. 2A on the TCQAG1B). 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 TCQAG1B.

Can I use this board with a Mark VIe controller?

No—the TCQAG2B uses the older Mark VI backplane pinout. Mark VIe uses a different assignment and typically uses the IS200TCQAG2B 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 TCQAG2B 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 4.0 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. Input threshold detection test: Apply a voltage near the switching threshold and verify the diagnostic reports the input is “near threshold.”
6. 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.
7. Output current monitoring test: Connect a load to one output and verify the reported current matches the actual measured current.
8. EMC test (if equipment available): Apply a 10V/m radiated RF field—verify inputs and outputs remain stable.
9. Isolation test: Apply 1800Vrms 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 TCQAG1B’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-2 applications (not SIL-3). We recommend:

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

What’s the lead time for a replacement TCQAG2B?

These boards are less common than the TCQAG1B:

• 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 IS200TCQAG2B (Mark VIe version). The backplane pinout is different.

What termination board should I use with the TCQAG2B?

The TCQAG2B 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 and EMC protection, use shielded wiring and follow the grounding instructions in the GE manual.

What’s the update rate for this board?

The TCQAG2B 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 250VAC or 1.5A at 30VDC. For inductive loads (solenoids, contactors), use an external snubber circuit to protect the output. The lower current rating (1.5A vs. 2A on the TCQAG1B) is the trade-off for the higher channel density. If your load exceeds 1.5A, consider the TCQAG1B or add an external relay.

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