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5.13.10.2. Programmers in synchronous mode
In this work mode the two programmers have the same
time base, and the ramp and hold times of each step of the
second programmer (PROG2) are therefore the same as
those of the first programmer (PROG1).
Consequently, the Start-Stop, Skip step, Skip to end program,
and Reset commands are common to both programmers.
If PROG1 has to run a number of steps higher than those of
PROG2, PROG2 will maintain the state of its last programmed
setpoint.
If PROG1 has to run a number of steps lower than those of
PROG2, PROG2 will interrupt its program in advance without
ending it.
Consents, i.e. step enable conditions (ENABLE), are the ones
defined by the programmers for the step they are executing,
i.e.:
•
consents for the step that the first programmer (PROG1)
is executing;
•
consents
for
the
programmer
(PROG2)
5.13.11. Program times
For each programmer, the User menu and Home page can
display the following time values:
•
Programmer theoretical time
Displayable with parameters P.t.t1 and P.t.t2, the time
elapsed from the START command to END condition.
This time resets after a programmer RESET.
This time stops in case of an HB alarm or lack of con-
sent.
The time goes from 0 to TotalTheoreticalTime = ∑
time + hold time)i ,with which it varies from 1 to N (where
N = number of steps).
•
Programmer Real time
Displayable with parameters P.E.t1 and P.E.t2, the time
elapsed from the START command to END condition.
step
that
the
second
is
executing.
Example of synchronous PROG1 and PROG2 programmers
(ramp
i
80209C_MHW_850-1650-1850_01-2020_ENG_pag. 217
It follows that the time base is suspended until all of the
consents are checked (those for the step in execution in
PROG1 and those for the step in execution in PROG2).
The start step and start hold events are the ones for the step
in execution by its programmer.
The settings for SUBDUED SETPOINT are the ones for the
step in execution by the respective programmer. There are
no conflicts because it is decided a priori which of the two
outputs each programmer will manage.
The settings for HBB (ENABLE, BAND, HBB.R, HBB.H) are
the ones for the step in execution by its programmer.
Since the programmers are synchronous it follows that, in
case of HBB, the time base stops when the alarm trips on
one or both of the programmers, blocking both programs.
This time resets after a programmer RESET.
As opposed to Theoretical time, Real time continues to
run even in case of an HB alarm or lack of consent.
•
Programmer residual theoretical time
Displayable with parameters P.r.t1 and P.r.t2, the dif-
ference between TotalTheoreticalTime and Theoretical
time elapsed in the programmer.
After the controller is powered off and then powered on,
Theoretical time and Real time elapsed for each programmer
resumes at the value derived from the step search (zero if the
programmer is configured to start at the beginning).
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