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The GE DS200DTBDG1A, also cataloged as the DS200DTBD Contact Output Expansion Termination Module, operates as a dedicated hardware component for relay signal termination and contact output power distribution within Mark V Turbine Control System platforms.

Hardware Specifications

Parameter Specification
Model DS200DTBDG1A
Brand GE (General Electric)
Origin USA
Weight Standard PCB footprint
Dimensions Standard Mark V terminal board profile
Operating Temp 0 to 60 deg C
Power Consumption Loop and backplane power driven
Functional Acronym DTBD
Product Type Contact Output Expansion Termination Module
Terminal Blocks 2 blocks (107 terminals per block)
Hardware Jumpers 2
Primary Connectors 3 34-pin connectors (J8, J19, J20)
Relay Signal Connectors 8 connectors (JS1 through JS8)
Diagnostic Points Hardware test points (TP prefix, e.g., TP1, TP2)
PCB Coating Conformal Coating
Functional Revision Group 1, Revision A

Backplane Bus Communication Velocity & I/O Density Scaling

The DS200DTBDG1A scales discrete I/O density via 214 physical screw terminals, interfacing relay driver lines directly to the control architecture. High-speed signal paths maintain deterministic response times across eight discrete connectors (JS1 through JS8), which receive relay actuation signals directly from the TCRA board. Solenoid control and 125 VDC contact output power streams are routed via 34-pin ribbon bus headers (J8 connecting to TCPD, alongside J19 and J20), preserving high-velocity backplane bus communication velocity and ensuring firmware flash compatibility across Mark V revision updates.

Frequently Asked Questions

Q: What function do connectors J8, J19, and J20 serve on the DTBD board?

A: Connector J8 links directly to the TCPD board for solenoid power distribution, while 34-pin headers J19 and J20 handle 125 VDC power routing for output contacts 47 and 48.

Q: How are external relay actuation signals interfaced to the module?

A: Discrete relay driving signals are routed from the TCRA board into the DS200DTBDG1A via eight dedicated connectors labeled JS1 through JS8.

Field Installation Guidelines

  1. Lock out and isolate all primary DC power feeds and field solenoid voltage sources before touching module wiring.
  2. Confirm a zero-energy state on all terminal connection points using a calibrated multi-meter.
  3. Wear a grounded ESD wrist strap to protect onboard semiconductor components during handling and cable connection.
  4. Secure incoming field conductors into the 214 screw terminal positions (107 per block), verifying tight mechanical connection without over-torquing.
  5. Verify cable header alignment for connectors J8, J19, J20, and JS1 through JS8 against system schematics before restoring system power.

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