Siemens v1.0 Service Manual Page 116

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Extended example
3.2 Expanding the program
STEP 7 Basic V10.5
116 Getting Started, 12/2009, A5E02651459-01
10. Interconnect the "LED" tag with the "Q 0.0" output of the PLC.
The "LED" tag is defined and displayed at the "Q 0.0" output of the PLC. The tags
previously defined in the PLC tag table are displayed at the inputs of the PLC.
Note
Defining tags
It makes no difference whether you define the tags at the inputs and outputs in the device
view, the PLC tag table or the networks. The tags you have already defined will also be
displayed in the device view.
11. Click the "Save project" button on the toolbar to save the project.
Result
You have programmed a status light to indicate the operating modes of the heating chamber.
When the heating chamber is switched on, the "chamber_ON_OFF" tag has the signal state
"1". The "LED" tag is set to the signal state "1" by means of the "Output coil" instruction. As
long as the heating chamber is switched on, the "LED" tag has the signal state "1". When the
heating chamber is switched off, the value of the tags "chamber_ON_OFF" and "LED"
changes to "0"
In the following sections you will test the created program with program status.
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