Siemens v1.0 Service Manual Page 54

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Simple example
2.5 Test program
STEP 7 Basic V10.5
54 Getting Started, 12/2009, A5E02651459-01
2.5.2 Test program with program status
Introduction
The following steps show you how to test the created program with program status. If you
display the program status, you can monitor the execution of the program. You can enable
the status starting at a specific location in the program and you then obtain an overview of
the values of the individual tags and the results of logic operations. This allows you to check
whether or not the components of the automation system are being correctly controlled.
The display of the program status is updated cyclically. It begins at the selected network.
In the program status you can allocate values to the tags by performing one of the following
actions using the "Modify" command of the shortcut menu:
Modify to 1: Use this command to set the tags of the BOOL data type to the signal state
"1".
Modify to 0: With this command you set the tags of the BOOL data type to the signal state
"0".
Modify value: You can enter a modify value for tags that are not of the BOOL data type.
Requirements
The PLC is configured.
There is no voltage at the inputs and outputs of the PLC, because the modified values
are overwritten by the module in online mode.
The organization block "Main [OB1]" is opened in the program editor.
Procedure
To test the created program with program status, follow these steps:
1. Enable monitoring.
The program status is displayed.
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