Chapter 8 Data Unit Type User-defined names and member names can be composed of 30 characters at most, and a Chinese character takes two characters. It is not allowed to use a name reserved by the system, e.g. an instruction code, a device name, or a name given a special significance. However, if a name reserved by the system is a part of the names of a structure or an element, it is then a legal name. For example, “M0” is an illegal name, but “_M0” is a legal name. User-defined names and member names cannot contain space. For example, “INPUT CH0” is an illegal name.
User-defined names and member names can contain underline but it is not allowed to use 2 underlines in a row or put it in the end. For example, “INPUT_CH0”is acceptable, but “INPUT__CH0” and “INPUT_CH0_” are illegal. User-defined names and member names cannot contain special characters, including *, #, ?, \, %, @ and more. 8.2.3 Using a Structure Variable After the creation of the structure type is done, users can declare the variable symbol in the Local Symbols page. Open the Add Symbol window from the Global and local symbol table and input the identifier and then click on the right as the image shown below.
Select the Data Unit Type, and the declared structure data type, then click OK to add a new symbol. 8-5