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在 STEP 7 (TIA Portal) 的一个 S7-SCL 项目中如何定义常数?
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How do you define the constants in an S7-SCL program in STEP 7 (TIA Portal)?
Instructions
In this video we will show you how you can define the constants in an S7-SCL program in STEP 7 (TIA Portal).
The definition of the constants in S7-SCL is different in the TIA Portal and in STEP 7 V5.x Classic. In STEP 7 V5.x Classic you can only define the local constants in the declaration part of the SCL block code and use them in the program.
In STEP 7 (TIA Portal) it is not possible to define constants in the declaration part of the SCL program code. STEP 7 (TIA Portal) differentiates between local and global user constants that you can define in the block interface or in the PLC tags.
- Open the block in the S7-SCL programming language, in this example FC1.
- Define your local user constants in the block interface under "Constant".
- Here you must define a data type for the use constants.
- You can then use the constants in the block program and create your program.
Only use local constants within a block. In this way the block remains universal and can be used in a library.
You define the global user constants, which are to be available CPU-wide, in the PLC tags.
- Open the PLC tags and switch to the "User constants" tab.
- Define your global constants. You must also specify the data type when defining the global user constants.
This allows you to define constants that have a fixed value that cannot change during program runtime.
Further Information
you will find under
- How do you define the "TRUE" constant in the LAD/FDB editor in STEP 7 (TIA Portal)?
- What is the meaning of the system constants in STEP 7 (TIA Portal) with S7-1200/S7-1500?
FAQ changes since last release
- The FAQ has been revised and the video added
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