StEP2: SP 2=400 , t 2=60.0 Temperature raised to 400℃ , slope of raising curve is 10℃ /minute, The program take 60
minutes to raise temperature to SP3 (400 degree). It means keep the same temperature in 60 minutes.
StEP3: SP 3=400 , t 3=120.0 This is the step for temperature cooling down, slope of cooling curve is 2℃ /minute, and
the time needed is 120 minutes to reach SP4 (160degree).
StEP4: SP 4=160 , t 4=0.0 When temperature reached 160 degree, the program get in Hold state. If need go to next
step, it needed operator to executed the “run” for next step.
StEP5: SP 5=160 , t05=-1.0 Jump to StEP1 to start from beginning.
In this example, it is assumed that the deviation high alarm is set to 5℃. Because the temperature of StEP 5 is 160℃,
and the temperature of StEP1 is 100℃, when program jumps from StEP 5 to StEP 1, the program will change to
preparation state at first(if preparation mode “rdy” was enabled), i.e., Control the temperature until the deviation
between setpoint and PV is less than deviation high alarm value. After temperature is controlled to 105℃, the program
will be started from StEP 1, and run the above steps again. The temperature control drawing w as shown below.
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