G103 specifies the maximum number of blocks the control looks ahead (Range 0-15), for example:
During machine motions, the control prepares future blocks (lines of code) ahead of time. This is commonly called Block Look-ahead. While the control executes the current block, it has already interpreted and prepared the next block for continuous motion.
A program command of G103 P0, or simply G103, disables block limiting. A program command of G103 Pn limits look-ahead to n blocks.
G103 is useful for debugging macro programs. The control interprets Macro expressions during look-ahead time. If you insert a G103 P1 into the program, the control interprets macro expressions (1) block ahead of the currently executing block.
When a G103 P1 is called, it is best to add several empty lines after a block with G-code if a block using macros follows that G-code block, to ensure that the macro statement is only evaluated after the previous G-code block is processed. This keeps macros from unintentionally being reassigned values before the G-code blocks are done (see example below), and also helps ensure that the value of macros used during conditional statements are the intended values.
This is intended to turn an output on, wait 1 second, and then turn it off. However, lookahead causes the output to turn on then immediately back off while the control processes the dwell. G103 P1 is used to limit lookahead to 1 block. To make this example work properly, modify it as follows:
G103 affects cutter compensation and High Speed Machining.
|The P values are modal. This means if you are in the middle of a canned cycle and a G04 Pnn or an M97 Pnn is used the P value will be used for the dwell / subprogram as well as the canned cycle.|
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