Product Overview
The GE IS200TDBSH2A is a Simplex Discrete I/O Terminal Board designed for the Mark VIe series of turbine control systems. This board provides reliable contact input sensing and relay output switching in a compact, DIN-rail mountable package. With 24 discrete contact inputs and 12 relay outputs, the IS200TDBSH2A offers robust I/O expansion for demanding industrial environments.
Technical Specifications
| Parameter |
Value |
| Part Number |
IS200TDBSH2A |
| Manufacturer |
General Electric (GE) |
| Series |
Mark VI Speedtronic |
| Functional Designation |
Contact Input/Relay Output Terminal Board (TDBS) |
| Input Channels |
24 Discrete Contact Inputs |
| Output Channels |
12 Relay Outputs |
| Excitation Voltage |
125 VDC or 24 VDC (Jumper Selectable) |
| Excitation Voltage Range |
18 to 132 VDC (Application Dependent) |
| Wetting Current |
2.5 mA per Channel (Nominal) |
| Input Filter Constant |
4 ms (Hardware-Based Debounce) |
| Relay Type |
Form-C (Changeover Architecture) |
| Relay Contact Rating |
2.0 A Continuous |
| Relay Commutation Speed |
<10 ms (Typical) |
| Surge Suppression |
Integrated Metal-Oxide Varistors (MOV) per Channel |
| Isolation Rating |
1500 V RMS (Group Isolation) |
| Interface Connector |
37-Pin D-Sub Connector (JR1) |
| Terminal Blocks |
Two Barrier-Type Terminal Strips |
| Redundancy Mode |
Simplex Configuration |
| Dimensions |
23.8 cm (H) × 17.8 cm (W) |
| Operating Temperature |
-30°C to 65°C |
Key Features
-
24 Discrete Contact Inputs with group isolation and noise suppression.
-
12 Form-C Relay Outputs rated at 2.0 A continuous.
-
Jumper-selectable excitation voltage (24 or 125 VDC) for flexible integration.
-
Integrated MOV surge suppression protects against transients and high-frequency noise.
-
Hardware-based 4 ms input filter ensures reliable debouncing.
-
DIN-rail or flat mounting options for easy installation.
Applications
The IS200TDBSH2A excels in gas and steam turbine control systems, where it interfaces with limit switches, pressure switches, and other discrete sensors. It also suits industrial process control panels requiring reliable relay outputs for valve actuators or alarm annunciators. The board's 1500 V RMS isolation ensures safe operation in high-voltage environments.
In a typical Mark VIe application, the IS200TDBSH2A connects to a PDIO I/O pack via the 37-pin D-Sub connector, providing a clean interface between field devices and the controller. Its simplex configuration is ideal for non-redundant control loops.
Installation & Setup
Mount the IS200TDBSH2A on a DIN rail using the included plastic insulator and sheet metal carrier, or bolt it directly into a cabinet. Wire field connections to the two 48-point terminal blocks (TB1 for relays, TB2 for contact inputs) using #18 AWG wire. Terminate shields on a separate bracket to avoid ground loops. If using an optional relay board, plug it onto connectors JW1 and JW2; it will be held in place by connector force.
Set the excitation voltage jumper to match your system's wetting voltage (24, 48, or 125 VDC). Ensure the supply voltage is within the 18.5–32 VDC range for the board's internal 24 VDC supply.
Maintenance & Reliability
Routine inspection of the IS200TDBSH2A should focus on terminal block tightness and relay contact integrity. The board's polymer PTC fuses on the 24 VDC supply are resettable, reducing maintenance downtime. The operating range of -30°C to 65°C makes it suitable for harsh environments, but avoid condensation and excessive vibration.
Regularly test relay switching and input sensing using the built-in diagnostics available through the controller. The MOV surge suppressors protect against voltage spikes, extending board life.
Compatibility & Integration
The IS200TDBSH2A integrates seamlessly with Mark VIe PDIO I/O packs, which communicate with the controller over Ethernet. It is also compatible with GE's SRLY relay board and STCI contact input terminal board wiring assignments, simplifying retrofits. The board supports optional relay expansion via the WROBH1A option board for fused power distribution.
Selection Guide
Before purchasing, verify your system's wetting voltage requirements and redundancy needs. The IS200TDBSH2A is simplex-only, so choose a redundant board if your application demands fail-safe operation. Confirm the 37-pin D-Sub connector (JR1) matches your PDIO pack. For expert advice and genuine GE parts, trust PLC Source PRO to supply the IS200TDBSH2A and compatible accessories.