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Time switch based on the S7-300/400 CPUs with simple HMI system
including radio-controlled clock connection
Rev. B - final 19.07.2002 13/84
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BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc
Diagram of user software running on the standard components
Fig. 2-2 User software
Description of the complete solution
Solving the task described in chapter 1 requires several blocks (see
Chapter 2.1) for time-dependent setting or resetting of an output. In our
solution the block parameter are input via an HMI-system (see
Chapter 2.2).
However, the parameters can also be input directly at the block.
The application contains function blocks for absolute and relative time
switch functions (clocks). Each clock has only one setting option
(corresponding to a “cam”), i.e. only respectively one switch-on and one
switch-off time can be entered at a block. This way of handling has many
advantages:
• The function blocks are kept very fine-granular. This enables ideal usage
of the storage requirements of the S7-CPU.
• Flexible application of the blocks.
• Simple parameterization of the blocks.
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