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The IS200VSVOH1B is a VME servo control board manufactured by General Electric and is part of the Mark VI series used in gas turbine control systems.

Four electro-hydraulic servo valves operating the steam/fuel valves are under the direction of the servo control (VSVO) board. Typically, two servo terminal strips are used to separate the four channels (TSVO or DSVO).

Valve position is determined using a linear variable differential transformer (LVDT).

VSVO implements the loop control algorithm. Three cables connect to the VSVO at the J5 plug on the front panel and the J3/J4 connector on the VME rack.

The JR1 connector is used for TSVO to provide simplex signals, while the JR1, JS1 and JT1 connectors are used for fanout TMR signals. Plug the external trip of the protection module into JD1 or JD2.