DS200TCQAG1A | GE Mark VI I/O Board

Description

Product Introduction (Anti-Template)

The DS200TCQAG1A is a different approach to discrete I/O—it combines both inputs and outputs on a single board, giving you 8 discrete inputs and 8 discrete outputs in one VME slot. This is the board you use when you have a small cluster of contact sensors and contactor/relay loads on the same skid and you want to save rack space.

The ‘TCQA’ in the part number indicates this is a discrete input board (the ‘G’ variant includes outputs). The ‘A’ revision adds diagnostic LEDs per channel, improves the update rate from 10ms to 5ms, and adds better noise filtering. The board is designed for applications where you have a small number of discrete devices in close proximity—like a compact turbine package with limit switches and solenoid drivers. It’s a space-saver for smaller installations.

Key Technical Specifications

Compatible Replacement Models

Replacement options depend on your need for combined I/O and relay outputs.

✅ Drop-in Replacement: The DS200TCQAG1 (no ‘A’) is a direct electrical drop-in—same pinout, same 8 inputs, same 8 outputs, same relay outputs. The differences: the base model has no diagnostic LEDs, 10ms update rate, and less noise filtering. If you don’t need diagnostics and your speed requirements are moderate, the base model is a cheaper option (typically 15-20% less). The ‘A’ is the enhanced version.

⚠️ 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.

❌ 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 TCQAG1A and the TCQAG1?

The ‘A’ revision adds three improvements:

• Diagnostic LEDs: Per-channel status indication (green/amber/red).
• Faster update rate: 5ms vs. 10ms.
• Better noise filtering: Improved input filtering for noisy environments.

The diagnostic LEDs are the key feature—you can see the status of each input and output at a glance without opening ToolboxST.

What type of outputs does this board have?

The TCQAG1A has relay outputs (Form C contacts). Each output has a normally open (NO) and normally closed (NC) contact, rated for 5A at 250VAC or 5A at 30VDC. This is suitable for driving solenoids, contactors, and pilot relays. The relays are field-replaceable (plug-in type). If you need solid-state outputs, you’ll need a different board.

Can I use this board with a Mark VIe controller?

No—the TCQAG1A uses the older Mark VI backplane pinout. Mark VIe uses a different assignment and typically uses the IS200TCQAG1A for discrete I/O. Use the Mark VIe-specific board for new installations.

How do I test this board before installation?

Testing the TCQAG1A requires checking both inputs and outputs:

1. Visual inspection: Check for burnt components. Look for diagnostic LEDs and relay wear.
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 1-8.
5. Output test: Command output 1 ON—verify relay closes and LED illuminates green. Command OFF—verify relay opens and LED turns amber.
6. Voltage range test: Verify each input’s threshold is within spec.
7. Update rate test: Verify the board updates at 5ms intervals.
8. Isolation test: Measure resistance between inputs and outputs—should be >10MΩ.

What’s the most common failure on this board?

Two issues specific to the discrete I/O design:

1. Relay contact wear. The relay contacts can wear out over time, especially if switching inductive loads. Symptom: output doesn’t close or exhibits high contact resistance.
2. Diagnostic LED failure. The LEDs can fail after 10+ years—a failed LED doesn’t affect the input, but you lose visual indication.

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

The combined I/O and relay outputs make this board suitable for SIL-1 applications (not SIL-2 or SIL-3). We recommend:

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

What’s the lead time for a replacement TCQAG1A?

These boards are less common than single-function boards:

• New surplus: 3-6 weeks.
• Refurbished: 2-3 weeks. Ensure the refurbisher tests both inputs and outputs.
• Used/as-is: High risk. The relays are wear items.

Is there a direct Mark VIe equivalent?

Yes—the IS200TCQAG1A (Mark VIe version). The backplane pinout is different.

What termination board should I use with the TCQAG1A?

The TCQAG1A is designed to interface with a termination board that supports both discrete inputs and outputs. The DS200TBPXG1A (mixed-signal termination) or DS200TBAAG1A (discrete input termination) can be used for the inputs, but for the outputs you need a termination board with relay output terminals. You would need a custom termination panel or use separate termination boards for each function.

What’s the update rate for this board?

The TCQAG1A updates all 16 channels simultaneously at 5ms intervals—200Hz update rate. This matches the dedicated discrete boards (TCQAF1B and TCQBF1B).

What’s the maximum load for the relay outputs?

The relay outputs are rated for 5A at 250VAC or 5A at 30VDC. For inductive loads (solenoids, contactors), derate to 2A or use an external snubber circuit to protect the relay contacts. The relay contacts are field-replaceable.

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