Programmer Operation Installation and Operation Handbook
5.1
What Is Setpoint Programming?
Many applications need to vary temperature, or process value, with time. Such applications need a controller
which varies a setpoint as a function of time. All 2416 programmer models will do this.
The setpoint is varied by using a
setpoint program
. Within each 2416 controller there is a software module, called
the programmer,
which stores one, or more, such programs and drives the setpoint according to the selected
program. The program is stored as a series of ‘ramp’ and ‘dwell’ segments, as shown below.
Figure 5-1: Setpoint profile
(
If the 8-segment programmer is being used, then the information in the next paragraph does not apply.
)
In each segment you can define the state of up to two outputs, each of which can be used to trigger external
events. These are called
event outputs
and can drive either relay, logic, or triac outputs, depending on the
modules installed.
A program is executed either, once, repeated a set number of times, or repeated continuously. If repeated a set
number of times, then the number of cycles must be specified as part of the program.
There are five different types of segment:
Ramp
The setpoint ramps linearly,
from its current value to a new value, either at a set
rate (called
ramp-rate programming
), or in a set time (called
time-to-target
programming
)
.
You must specify the ramp rate, or the ramp time, and the target
setpoint, when creating or modifying a program.
Dwell
The setpoint remains constant
for a specified period.
Step
The setpoint steps instantaneously
from its current value to a new value.
Call
The main program calls another program as a subroutine
. The called program
then drives the setpoint until it returns control to the main program. This facility is
only available on those controllers capable of storing 4 programs.
End
A program either ends in this segment, or repeats.
You specify which is the case
when you create, or modify, a program (see the final topic in this chapter). When a
program ends, the programmer is put into either, a continuous Dwell state with all
outputs staying unchanged, or the Reset state.
Table 5-1: Segment types
Time
Setpoint
5-2 HA025041 issue 12 Aug 14
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