Siemens v1.0 Service Manual Page 96

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Extended example
3.2 Expanding the program
STEP 7 Basic V10.5
96 Getting Started, 12/2009, A5E02651459-01
3. Double-click the operand placeholder above the normally open contact.
4. Interconnect the normally open contact with the tag "ON".
Result
You have inserted a normally open contact and interconnected it with the tag "ON".
You have thereby programmed the first condition for starting the conveyor. When the
machine is switched on the "ON" tag is set to the signal state "1", the normally open contact
closed and the current relayed to the rung. In the next section you will program more
conditions, which will be executed depending on the signal state of the "ON" tag.
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