Siemens v1.0 Service Manual Page 103

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Extended example
3.2 Expanding the program
STEP 7 Basic V10.5
Getting Started, 12/2009, A5E02651459-01
103
Result
You have programmed the conditions for starting the conveyor.
The conveyor is set into motion when the signal state of the "ON" tag is "1" and at least one
of the following conditions applies:
A bottle is detected by the light barrier (LS1) at the start of the conveyor and the heating
chamber is switched off. In this case the "LS_1" tag supplies the signal state "1" and the
"chamber_ON_OFF" tag the signal state "0".
The milk bottle has been pasteurized. In this case the "milk_pasteurized" tag has the
signal state "1". The bottle is transported to the end of the conveyor.
When the conveyor is set into motion, the "conveyor_drive_ON_OFF" tag has the signal
state "1".
In the next section you will program the conditions for stopping the conveyor.
3.2.3 Programming the conditions for stopping the conveyor
Introduction
The following steps show you how to program the conditions for stopping the conveyor. You
define these at the input R1 of the "Set/reset flip-flop" instruction, which you have inserted in
the last section of the organization block "Main [OB1]".
You program the conditions for stopping the conveyor with the help of the following
instructions:
Normally open contact
Normally closed contact
Set/reset flip-flop
Requirements
The pushbutton switch from the first part of the project has already been programmed in
the first network of the organization block "Main [OB1]".
The conditions for starting the conveyor have already been programmed in the
organization block "Main [OB1]".
See also: "Programming the conditions for starting the conveyor (Page 95)"
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