GE IS200VAOCH1B Mark VI Analog Output Board

IS200VAOCH1B provides sixteen single-ended analog current outputs with a 0–20 mA span. The VAOC board contains the converter and drivers, while the matched terminal board carries the field connections and current feedback.

IS200VAOCH1B belongs to the original VAOCH1B generation. GE documents a load up to 500 Ω at 20 mA at the end of 1000 ft of #18 wire, using the corresponding original-generation terminals.

IS200VAOCH1B uses the original VAOC generation, for which GE specifies TBAOH1B or earlier. The terminal-board generation must be matched to the processor; the later H1C higher-drive arrangement has a different TBAO requirement.

IS200VAOCH1B uses the documented VAOC twelve-bit D/A conversion with 0.5% accuracy. All sixteen outputs operate at a 100 Hz frame rate, with output current measured on the terminal board and fed back for regulation.

IS200VAOCH1B can operate with three VAOC boards in the R, S and T racks connected to a common terminal board. The output circuit produces the median-selected current, and the remaining two boards maintain current when one output fails.

IS200VAOCH1B is an H1B-generation VAOC reference. VAOCH1C and later provide higher load capability on the first eight outputs and require TBAOH1C or later; they are not an unqualified board-only substitution.