Siemens v1.0 Service Manual Page 38

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Simple example
2.4 Create program
STEP 7 Basic V10.5
38 Getting Started, 12/2009, A5E02651459-01
Negated coil
The following figure shows the icon of the "Negated coil" instruction in the program:
<Operand>
---( / )---
The "Negated coil" operation inverts the signal state and assigns the corresponding bit to the
specified tag (<operand>). If the signal state is "1" at the coil input, the bit is reset to "0". If
the signal state is "0" at the coil input, the bit of the tag is set to "1".
Requirements
The project has been created.
The PLC is configured.
The organization block "Main [OB1]" is open.
Procedure
To create the program for switching the example machine on and off, follow these steps:
1. Activate the symbolic representation of the tag.
When the symbolic representation of the tags is activated, the addresses of the tags are
not displayed in the network.
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