Quick Sizing & Sourcing Snapshot
- Manufacturer: GE (General Electric / Speedtronic)
- Part Number: DS200TCQAG1BFD
- System Platform: Mark V Turbine Control System (Speedtronic)
- Hardware Type: RST Analog I/O Board (TCQA)
- Architectural Role: Sits in the R, S, or T Core Racks, conditioning analog signals (LVDT, 4-20mA, TC) from terminal boards and routing them to the CPU via the Q-Bus backplane.
- Key Specifications: 8 Differential Channels (Configurable I/O), Q-Bus Interface, TMR Compatible, Conformal Coating (FD).
System Architecture & Operational Principle
The lives in Purdue Level 2, occupying a slot in the R, S, or T Core Racks of a Mark V turbine control system. It is the primary analog signal workhorse for the RST (Redundant/Simplex/TMR) architecture.
Physically, it mounts via 6 screw holes aligning with the core rack standoffs. Upstream, it receives conditioned signals from Terminal Boards (like TCQA terminal blocks or external marshalling) via its 4x 34-pin and 2x 40-pin connectors (JAx, JBx). These carry raw or semi-conditioned data: LVDT positions (Governor Valve), 4-20mA (Pressure Transmitters), Thermocouples (Exhaust Spreads), and Servo Commands (+/- 10V).
Internal Processing: Unlike a smart I/O pack (Mark VI), this is largely a passive/hybrid analog mux. It uses Jumpers (J1-J6) to set channel ranges (e.g., 20mA vs 200mA for outputs, TC type selection) and Op-Amp buffers to drive the backplane. It does not run firmware logic; it prepares the analog voltage for the TCPS (Power Supply) and ultimately the TCEA (CPU).
Downstream, it communicates with the TCEA/TCCA processor via the Q-Bus (proprietary parallel backplane bus) using the JKX/JKZ/JKY (3PL) connectors. In TMR mode, three of these boards (R, S, T) vote on the analog values before the CPU acts, masking sensor drift or a failed LVDT.
Core Technical Specifications
- Channels: 8 Differential (Software/ Jumper Configurable as In or Out)
- Signal Types: 4-20mA, +/- 10V, LVDT, Thermocouple (J, K, T via external CJ)
- Input Accuracy: +/- 0.1% Full Scale (Typical)
- Output Drive: Up to 200mA (J5/J6 Jumper selectable for 20mA/200mA ranges)
- Connectors: 4x 34-pin, 2x 40-pin (Field I/O), 3x 20-pin (Q-Bus/JKX)
- Configuration: 6 Berg Jumpers (J1-J6 for Range/Type), DIP Switches (Addressing)
- Power Input: +5V, +/-15V DC (Sourced from TCPS on Backplane)
- Coating: Conformal Coating (Implied by “FD” Suffix – Heavy Industrial Grade)
- Indicators: 6 LEDs (Pwr, Comms, Status per pair, Self-Test)
- Operating Temp: -40°C to +85°C (Industrial Grade)
