PLC inside the commonly used symbols are divided into: basic data, composite data, parameters, three categories.
1. Basic Data: Basic data refers to the data whose Word length is less than 2 words (32 bits), including bit, Byte, word, DoubleWord, ASCII character, Integer, Double Integer, etc. These data are in accordance with IEC 1131-3.
2. Composite data: Composite data refers to the data whose characters are longer than 2 characters (32 bits). The data can be combined by basic data.
3. Parameters In SIEMENS S7 PLC, the data transmitted between logic blocks are called parameters. The parameters of S7 are divided into "formal parameters" and "actual parameters".
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