1. The process of compiling a program to convert an instruction mnemonic and a ladder symbol in a plc program into a CPU machine code is called "compilation". Through the compilation function, you can perform a comprehensive check on the syntax, structure, and graphics of the program.
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The program can be edited via the main menu option "PLC" - "Compile" or "Compile All" (see Figure 12-2.9).
By clicking the Compile and All Compile buttons on the toolbar (see Figure 12 - 2.10), you can also view the syntax and structure of the program. Among them, "compilation" is a check on the currently edited window (block or data block): "Compile all" is a check for all PLC programs (blocks, data blocks, and system blocks).
The default location of the system is the "Project File" file area of ​​STEP7 or the "All S7-200 Projects" file area. File names can be entered and modified as needed.
After the compilation is completed, the compilation result of the input PLC program, the size of the block, the error position and the error code can be displayed in the "Output Windows" area.
All compiler errors are listed in the output window. Double-click the error indication and the editor can directly position the cursor to the wrong location (see Figure 12-2.11). After the program is successfully modified, it can be compiled again until the error message disappears.
Common programming and compilation error codes of S7-200 and their meanings are as follows:
0001: The programmed high speed counter (HSC) has not been defined yet;
0002: The address of the interrupt input point conflicts with the high speed counter (HSC);
0003: The address of the high-speed counter (HSC) conflicts with the interrupt input point:
0004: ENI, DISI, HDEF instructions are used in the interrupt program:
0005: The high speed counter (HSC) is repeatedly defined;
0006: The indirect addressing method used is incorrect;
0008: too many nesting levels of subroutines;
0080: The program is too large to perform normal compilation processing;
0081: The program network is too complicated, causing a stack overflow;
0082: An illegal instruction was used in the program;
0083: The main program end instruction is missing;
0085: The FOR and NEXT instructions are not used together, and the FOR instruction is missing.
0086: The FOR and NEXT instructions are not used together, and the NEXT command is missing:
0087: Missing subroutine, interrupt program number;
0088: Missing subroutine end instruction;
0089: Missing interrupt program end instruction;
0090: The input parameter is incorrect:
0091: The range of addresses entered is incorrect;
0092: Counter count value setting is incorrect:
0093: There are too many nesting layers for FOR and NEXT.
2. After the program save program is edited, use the shortcut key 
The default location of the system is the "Project File" file area of ​​STEP7 or the "All S7-200 Projects" file area. File names can be entered and modified as needed.
