Step7 software is a feature of the debugging function is very powerful, not only can read data online, but also can modify process data online, for debugging large complex control program is very effective STEP7 software also comes with some control program modules, such as PID adjustment module, these modules can be called directly from the main control program, to achieve different functions. STEP7 uses a modular approach to program design, which manages the data required for user-written programs and program slots in the form of blocks of files. Typically, user programs consist of functional blocks (FB, FC), tissue blocks (Obs), and data blocks (Dbs).
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