Ab Rockwell 1756-ENBT module controller
Technical data of product parameters
Another 1756-ENBTimportant option is the proportional output option. If this option is selected,
the output voltage is set equal to demand position. The result is that 0 to 100%
demand gives 0 to 10.2 volts on the output.
The proportional output, failInPlaceFlag, and redundant LVDT options are single
flags that affect both channels.The Servo Driver operates on a basic 5 millisecond period. During the 5 millisecond
period, four interrupts occur. During each of the first three interrupts, AD readings 1756-ENBT
of position feedback are recorded for each channel. After the third AD reading is
taken, the three values are middle-selected and the PI algorithm is called.
The fourth interrupt in the 5 millisecond period handles watchdog timing,
contingency timing, and sequencing of diagnostics.If the module does not transition to normal mode, the user can determine the
reason by examining register E, which contains SFEs, or by using a laptop to
enter the “diag” command and print diagnostic information.
When the Servo Driver is powered-up or restarted, its primary objective is to avoid 1756-ENBT
an indeterminate output that would result in valve movement, and possible damage
to the valve or turbine. There are a number of hardware and software features that
prevent an indeterminate output.
The hardware is designed so that when the Servo Driver is powered-up, the power
supply to the servo output is turned off. With no current flow to the servo valve, it
is left under the influence of its mechanical bias adjustment, the assumed state prior
to power-up. In addition, the coil drive D/A converter is not turned on until it
receives the first output pattern
Product picture display
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