IS200TDBTH6ACD – GE Mark VIe I/O Terminal Board with 24 Inputs

Product at a Glance – IS200TDBTH6ACD

• IS200TDBTH6ACD – a Discrete I/O Terminal Board by GE.
• Part of the Mark VIe series for distributed control.
• Provides 24 isolated contact inputs + 12 form‑C relay outputs.
• Supports 24/48/125 V dc wetting voltage (external source).
• Built‑in noise suppression against surges and high‑frequency noise.
• Compatible with PDIO I/O packs and TMR controllers.

Technical Specifications (by category)

• Part Number: IS200TDBTH6ACD
• Manufacturer: General Electric
• Series: Mark VIe Speedtronic
• Channels: 24 inputs, 12 relay outputs (form‑C)
• Input Filter: hardware filter, AC rejection 12 V RMS
• Power: +5 V dc, input current 24 V dc
• Operating Temp: ‑30 to +65 °C
• Technology: surface mount
• Dimensions: 17.8 cm x 33.02 cm
• Mounting: DIN rail or flat panel
• Origin: USA (Salem, VA)
• Manual: GEH‑6721L

Functional Architecture

• Designed as a TMR contact I/O terminal board.
• 24 group‑isolated inputs accept wetting from external source.
• Noise suppression protects against surges & RFI.
• 12 form‑C relays with optional relay board (plugs into JW1/JW2).
• Connects to PDIO packs via D‑type connectors (JR1, JS1, JT1).
• Each PDIO links to a dedicated TMR controller channel.

Installation & Wiring

• Mount on DIN rail (with plastic insulator) or inside cabinet.
• Use #18 AWG wire for field connections.
• TB1 (upper) – relay outputs; TB2 (lower) – contact inputs.
• Screw assignments follow SRLY and STCI standards.
• Use separate bracket for end shields.

Relay Outputs & Option Board

• Option board plugs into JW1/JW2 and locks.
• TB1 assignments change with option board presence.
• External power can be wired to the option board connector.

Signal Conditioning & Input Ranges

• Same as STCI board, scaled for 24/48/125 V dc.
• Wetting ranges: 16‑32 V, 32‑64 V, 100‑145 V dc.
• Threshold voltage = half of wetting voltage.
• Inputs 1‑21: 2.5 mA; inputs 22‑24: 10 mA (resistance limited).
• 24 V supply current limited to 0.5 A via PTC fuses.

Configuration & Jumpers

• No jumpers on TDBT – hardware‑fixed.
• Option board (WROBH1) has 6 jumpers for relay enable.
• All jumpers assembled by default.
• Remove jumper for dry‑contact (no power distribution).

Hardware Highlights (visual inspection)

• 12 large black potentiometers (3 rows of 4).
• Grey rectangular component; many small ICs.
• Two rows of red MOVs (metal oxide varistors).
• Small 3‑port white connector.
• One yellow capacitor; two yellow resistors with black stripe.

Applications & Suitable Equipment

• Ideal for: Mark VIe turbine controls, DCS systems.
• Works with TMR controllers and PDIO packs.
• Used in power generation, oil & gas, heavy industry.
• Replaces older STCI/SRLY boards in retrofit projects.

Oiltech Controls’s Insight

• “This board excels in noise‑prone environments. Its 24 isolated inputs and 12 relay outputs give you flexibility for both digital and alarm circuits. We recommend pairing it with a PDIO pack for full TMR redundancy.”

5 Professional FAQs & Selection Tips

• Q: Can I use a single PDIO pack with this board?
  A: No. You need three PDIO packs for TMR operation. A single pack will not properly drive the TDBT.
• Q: What is the wetting voltage threshold?
  A: It is exactly half of the supplied wetting voltage – e.g., 12 V for 24 V wetting.
• Q: Are the relay outputs dry or wet?
  A: They are form‑C dry contacts. Use the option board if you need wetting power.
• Q: How do I select between 24, 48, or 125 V?
  A: Choose based on your field devices. The board accepts all three ranges; no jumpers needed.
• Q: What is the advantage of conformal coating?
  A: It protects against moisture and dust – essential for harsh industrial sites.

Selection Guide – Quick Check

• ✔ Confirm your system is Mark VIe (not VI or V).
• ✔ Check if you need 12 relays – if not, consider STCI.
• ✔ Verify wetting voltage matches your field power.
• ✔ Ensure you have space for DIN rail or panel mount.

Why Buy From Oiltech Controls?

• Over 15 years in industrial automation spares.
• Worldwide shipping with full tracking.
• We offer tested surplus / refurbished units.
• Each board gets technical verification before shipment.
• We support obsolete control systems with expertise.
• All orders include a 12‑month warranty.

Warranty & Shipping

• 12‑month warranty against manufacturing defects.
• Dispatch within 24‑28 hours after order.
• Ship via FedEx, UPS, or DHL – trackable worldwide.

Inquiries: info@oiltechcontrols.com or +86 158 8020 0923

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