The IS200DRLYH1AAA board is described as a Discrete I/O model. There are two different termination board types, this specific model is a termination box. In the GER-4193A Mark VI Turbine Control System, the model is described as being the same as the TRLY termination-barrier model except this model does not have any solenoid circuits.
The inputs of the DRLY model are twelve COs. There are several plug-in magnetic relays, they are labeled as dry form “C” contacts. There are different types of H1 circuit forms, one is an H1B form which is used for diagnostics for coil currents, and an H1C form which is used for diagnostics of a contact voltage.
This model is also known as a VTUR I/O termination model. When the IS200DRLYH1AAA model is being used as a VTUR I/O termination model the DRLY board will have twelve relays. While operating with the DRLY board with a VTUR model it must be used with a transition board, the transition board used with the VTUR and DRLY boards is the DTRT board.
The main components of the IS200DRLYH1AAA board are twelve relays and a single thirty-seven-pin sub-D connector. The sub-D pin connector is located on the right side of the board in a vertical orientation. The relays of this board are in two horizontal rows of six in the middle of the board. The rows are on opposite ends of the board.
The DRLY board can be used with several models in the Mark VI Series, as previously mentioned the model will work with a DTRT board when working with Discrete I/Os the boards are TRLY, TICI, TBCI, and DTCI boards.