<Toc>
<3. Programming>
3-21
IM 05E01D02-41E
1st Edition : May 31,2000-00
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Suspending the Progress of a Program (Wait Function)
When a running program moves from one segment to another, the wait function places the
program in a wait (stand-by) state, by using a wait zone and a wait time, until any deviation
is cancelled.
The wait function works only when the program moves from a ramp segment (either up-
grade or downgrade) to a soak segment (where the setpoint is kept constant).
A wait zone is a deviation bandwidth from which the degree of PV input tracking is judged.
A wait time is the length of time that elapses until the PV input enters the wait zone. The
program progresses if the PV input fails to re-enter the wait zone within the wait time.
When the program is in the wait state, the time setpoints of Segment Time and Time Event
parameters temporarily cease to be passed. At this point, the output based on the Time
Event parameter is retained.
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If the PV Input Reaches the Wait Zone before the Wait Time Expires
If the PV input re-enters the wait zone after the start of wait action and before the expiry of
the wait time, the program changes from a wait state to a run state and begins to progress.
Wait zone
Wait time
PV input
Target setpoint
Program
setpoint
Wait zone
Start of wait action
A point at which the PV
input re-entered the wait zone
within the wait time
The program
enters a wait state at
this target setpoint.
●
If the PV Input Reaches the Wait Zone after the Wait Time Expires
If the PV input re-enters the wait zone after the start of wait action and after the expiry of the
wait time, the program changes from a wait state to a run state at the point where the wait
time has passed, and begins to progress.
PV input
Program
setpoint
Target setpoint
Wait zone
Wait time
Wait zone
Start of wait action
A point at which the PV
input re-entered the wait zone
after the expiry of the wait time
A point where the
wait time has passed.
<Controller Settings>
Setpoint of WIT.Z (Wait Zone) operating parameter
OFF, 1.0 to 10.0% of PV input range span
Setpoint of WIT.T (Wait Time) operating parameter
OFF, 0.00 to 99.59 (“hour and minute” or “minute and second”)
The time unit is the same as that specified in the TMU
(Time Unit of Program) setup parameter.
Summary of Contents for UP350
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