Siemens v1.0 Service Manual Page 48

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Simple example
2.5 Test program
STEP 7 Basic V10.5
48 Getting Started, 12/2009, A5E02651459-01
2.5 Test program
2.5.1 Loading the program to the target system
Introduction
The following steps show you how to load the program to the PLC. An online connection is
established during the loading process between your programming device (PG) or
programming computer (PC) and the PLC. The program that is stored on the hard disk of
your programming device (PG) or programming computer (PC) is written to the memory of
the PLC during the loading step. The blocks contained in the program are compiled during
the loading process so that they can be processed by the PLC. Once the program is
compiled and loaded, it can be processed by the PLC.
Note
Online/offline comparison
Changes made to the program on the programming device / PC after the loading process
are not registered by the PLC. You can use the TIA Portal for an online/offline comparison of
your project data and to display any deviations. In online mode you can determine with the
help of the icons in the project tree if the "Offline" program components on your
programming device / PC are identical with the "Online" programming elements on the PLC.
To refresh the status of the program on the PLC, you have to re-load the program.
Requirements
A connection is established between the programming device / PC and the PLC (see
"Additional Information").
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