What Is A Program; Programmer Functions - gefran 650 Abbreviated Manual

5.13.1. What is a program

A program is a set of steps, each having a number of pa-
rameters, that let you control the value of a process or of a
device based on lapsed time, on specific conditions, and on
reference values saved in the controller or supplied to it from
the outside.
In its simplest form, a step has two parts, represented on the
graphs by two segments:
• a (possible) ramp, i.e., a variable change in the setpoint
value time;
• a hold, i.e., a time in which the process value is held
constant after it has reached the setpoint value.
Step Step
Passo Passo
SV 1 2
1 2
A program can have a maximum of 12 steps and up to 4
programs can be saved in the controller.
Each program is defined by the number of its first and last
step.
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Gefran 650/1250/1350 Temperature Controller – Abbreviated Manual
Step Step Step
Passo Passo Passo
3 4 5
3 4 5
A program can be selected from the keypad, digital input or
serial line.
The program can be controlled from the keys, digital inputs
(START/STOP, RESET, end program), serial line, or events
(output of Function Block).

5.13.2. Programmer functions

Depending on the model, the controller can combine the
two functions of controller and single-loop programmer.
Base time accuracy is 4 seconds every 10 hours
Programmer stop and restart modes
The programmer can be started or stopped from:
• digital input;
• key (START),
the absence of other enablings;
• alarm state (ON = START);
• different restart modes after a Power-off; (Power Off);
Time
tempo
• setpoint preceding a Power-off;
• process variable value at time of Power-on;
• optimal search for setpoint forward/back in time;
• wait for Start.
(STOP) and + (RESET) in
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