Software section
3.2 Creating the program
S7-1500
60 Getting Started, 05/2014, A5E03981761-AC
Expanding and reloading the optimized "Filling" data block
Introduction
In the following section, you will supplement the "Filling" data block with the date and time of
the last filling and reload the data block. To do this, create a block for recording the date and
time and enable the function "Download without reinitialization".
The "Download without reinitialization" function protects the actual parameters of the
data block from being overwritten during download to the CPU.
Advantages of symbolic addressing:
The use of universally applied and meaningful symbols
in the entire project makes the program code easier to read and understand. This gives you
the following advantages:
● You do not have to write detailed comments.
● Data access is faster.
● No errors occur when accessing data.
● You no longer have to work with absolute addresses.
● The assignment of the symbol to the memory address is monitored by STEP 7, which
means that all points of use are automatically updated when the name or the address of a
tag changes.
● The library has been loaded
● The project has been compiled and loaded into the CPU
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