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Programming Function Blocks and Features
Video Recorder – User Manual 94
Loop Menu Items
Table 4-10 alphabetically describes every loop menu item. See Table 4-2 for additional prompts.
Table 4-10 Loop Prompts
Prompt Range/Selections Definition
APPROACH HIGH Enter a value 0.1 to 100 or
OFF.
This function affects the process variable approach to set
point when the process variable value is less than the set
point value. The value entered is the percent of span
deviation from set point at which a recalculation of the
loop integral value will occur. Enter a starting value equal
to the proportional band value (1/gain value) x 100 if Gain
is used, or OFF at initial configuration. The value may be
altered Online for final loop tuning. This function is useful
for batch startup from a "cold" condition to control
excessive overshoot when set point is reached.
APPROACH LOW Enter a value 0.1 to 100 or
OFF.
Affects the process variable approach to set point when
the process variable value is greater than the set point
value.
AUTO/MAN SELECT OFF, discrete parameter, 0, 1 This parameter takes the place of the Auto/Man button
when the DISCR VS KEY SEL discrete is ON (1).
AUTO/MAN SELECT = ON(1) = Manual mode
AUTO/MAN SELECT = OFF (0) = Automatic mode
When DISCR VS KEY SEL is OFF(0), AUTO/MAN SEL
has no effect.
CHG ACTION INPUT OFF, discrete parameter, 0, 1 Change Action Input. Selects the opposite control action
from that selected for the control action (see CONTROL
ACTION). Control action is opposite when the discrete
value is ON or "1".
CONTROL ACTION Reverse (REV) or Direct (DIR)
Acting Control.
When Reverse Acting Control is selected, the loop output
will increase as the process variable becomes less than
set point, and will decrease as it becomes greater than
the set point. When Direct Acting Control is selected, the
output action is opposite.
DISCR VS KEY SEL OFF, discrete parameter, 0, 1 Discrete vs. Keyboard select. When this discrete is ON
(1), the Auto/Man and Set point buttons are disabled; their
functioning is transferred to the AUTO/MAN SELECT and
SETPOINT SELECT discretes. See AUTO/MAN SELECT
and SETPOINT SELECT. Status changes made by
AUTO/MAN SELECT and SETPOINT SELECT will remain
when DISCR VS KEY SEL is OFF (0).
DUAL TUNING SEL OFF, discrete parameter, 0, 1 When ON(1), selects the second set of tuning constants
(#2). A bumpless transfer (integral term adjusted)
calculation will be made on transition.