The IS200TDBSH2A is a Simplex Discrete Input/Output Terminal Board developed by GE for the Mark VIe and Mark VIeS control system families. It functions as the field-wiring interface for the PDIO discrete I/O pack, providing 24 group-isolated contact inputs and 12 Form-C relay outputs on a single board. The module is designed for DIN-rail or flat-panel mounting and communicates with the controller over redundant Ethernet links via the plugged-in PDIO pack. The board accepts wetting voltages of 24 V DC, 48 V DC, or 125 V DC from an external source, with on-board noise suppression and surge protection on every input circuit. Discrete output circuits are implemented through electromechanical relays, and the relay section can be expanded with optional W-series daughter boards to add fused power distribution, voltage sensing, or solenoid drive capabilities.

Key Features

Combined Input/Output Architecture: Integrates 24 contact inputs and 12 relay outputs on one terminal board, reducing cabinet space and wiring complexity compared to separate input and output boards.

Group-Isolated Contact Inputs: All 24 inputs share a common isolation barrier. Input currents are resistance-limited to 2.5 mA on circuits 1–21 and 10 mA on circuits 22–24, with threshold detection at 50 % of the applied wetting voltage.

Form-C Relay Outputs: Twelve relays provide normally closed (NC), common (COM), and normally open (NO) contacts, plus a dedicated solenoid return (SOL) terminal for each channel.

Optional Daughter-Board Expansion: Three W-series option boards are supported:

IS200WROBH1A — adds fused and sensed power distribution to relays 1–6 and dedicated power to relay 12, functionally equivalent to the IS200TRLYH1B terminal board.

IS200WROFH1A — places a single fuse in series with each relay COM connection, with isolated voltage feedback for 9–240 V AC or 12–125 V DC applications.

IS200WROGH1A — distributes fused power from an input connector to each relay, also supporting 9–240 V AC or 12–125 V DC feedback.

Noise and Surge Protection: Each contact input includes hardware filters, noise-suppression components, and current-limiting resistors located near the point of signal entry to suppress high-frequency noise and transient surges.

Polyfuse Protection: The on-board 24 V DC supply is current-limited to 0.5 A by resettable polymer positive-temperature-coefficient fuses.

Pluggable Terminal Blocks: Two sets of 48-point terminal blocks (TB1 for relays, TB2 for contact inputs) accept #24–#12 AWG wiring. All versions use pluggable terminals for easier maintenance.

Flexible Mounting: The board mounts on a sheet-metal carrier for DIN-rail installation or on a flat sheet-metal assembly for direct cabinet bolting.

Parameter specifications

The difference between IS200TDBSH2A and IS200STCIH2A

Frequently Asked Questions

What I/O pack is required for the IS200TDBSH2A?

Can the IS200TDBSH2A be used in redundant configurations?

What is the purpose of the SOL terminal on each relay output?

The SOL terminal provides a dedicated return path for solenoid loads. Without an option board installed, the SOL terminal has no internal connection and must be wired externally if used.

Can TDBSH2A be replaced directly with TDBSH8A?

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