What is the difference between modal instructions and non-modal instructions?

The difference between modal instructions and non-modal instructions:

Non-modal instructions: are only valid in the current block used. When the block ends, The command function is automatically canceled;

Modal command: a group of commands that can cancel each other. Once this type of command is executed, it will remain valid until it is canceled by other commands in the same group.

For example:

N001 G91 G01 X10 Y10 Z-2 F150 M03 S1500;

N002 X15;

N003 G02 X20 Y20 I20 J0;

N004 G90 G00 X0 Y0 Z100 M02;

Explanation:

1) There are three modal instructions G91, G01, and M03 in the first paragraph, which are continued because they are in different groups Effective, the G91 function continues to be invalid when G90 appears in the fourth segment; the G01 function continues to be effective in the second segment, and is canceled when G02 appears in the third segment; the M03 function does not become invalid until M02 takes effect in the fourth segment.

2) Those with "*" in column (3) of Table 2-3 and "*" in column (5) of Table 2-4 are non-modal instructions, and their functions are only in the program segment where they appear. Medium and effective.

3) The M command with "*" in column (2) of Table 2-4 starts its function at the same time as the actions of other commands in the same section. The M command with "*" in column (3) of Table 2-4 starts only after its function is completed with other commands in the same section.

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