Extended example
3.2 Expanding the program
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The conveyor is stopped when the signal state of the tag "OFF is "1" or at least one of the
following conditions applies:
● The bottle was detected by the light barrier (LS2) in the heating chamber and the milk is
not yet pasteurized. In this case the "LS_2" tag supplies the signal state "1" and the
"milk_pasteurized" tag the signal state "0".
● The bottle was detected by the light barrier (LS3) at the end of the conveyor. In this case
the "LS_3" tag has the signal state "1".
When the the conveyor is stopped, the tag "conveyor_drive_ON_OFF" has the signal state
"0".
In the next section you will program the switching on and off of the heating chamber.
3.2.4 Programming the PLC of the heating
Introduction
The following steps show you how to program the PLC of the heating process. The heating
process is controlled by the switching on and off of the heating chamber. In the example
project it will be assumed for the sake of simplicity that the temperature of 75°C has already
been reached in the heating chamber when it is switched on.
You program the PLC of the heating chamber in the third network of the organization block
"Main [OB1]" with the help of the following instructions:
● Normally open contact
● Set/reset flip-flop
Requirements
● The organization block "Main [OB1]" is open.
● Networks 1 and 2 of the organization block "Main [OB1]" have been programmed.
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