TOSHIBA UTNH23A Toshiba controller module
Technical data of product parameters
This UTNH23A defines direct-access Ovation shared memory registers from the
Controller point of view. The Controller point-of-view is at the internal workings of UTNH23A
the algorithm (the MASTATION is assumed). Conversions may occur between the
applications level and the level described here. This format is used for start up,
local, and normal operating modes. In test mode, the format changes except for the
mode bits in register 6 (status register 1), Bits 0 through 3, and the FIFO control bits
in both the command register and status register 2.When the absolute value of the difference between target position and actual position
is greater that this value, the valve is considered to be in motion. Gain and reset values
are selected to cause rapid control action. When the difference is less than this value, UTNH23A
control action is softenedIf the absolute value of the difference between Valve Positioner target position and
actual position is greater than this value, then a contingency condition may exist. The
condition must exist until a timer expires for it to be reported. The timer is described
below.
A situation could arise where the Valve Positioner target position and the Controllers’
target are not equal. One example would be if the shutdown input was true, the Valve
Positioner set the target position to 0, but the Controller did not track. In this situation UTNH23A
contingency would not be reported if the valve went to 0% positionThis value is displayed in decimal. It is the converted hexadecimal A/D converter
reading for the 100% position. It can be entered by the customer; however, it is
normally determined automatically by the calibration sequence
Product picture display
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