Introduction to CNC Code - 4: A Block
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
A block is a series of words that defines a single instruction. A block can be a single word or a combination of words. A block is terminated by an end of block character (EOB). In some instances the EOB is visible and in some instances it is not. Some examples of blocks are provided below without a visible EOB:

N89 M30 (two word block)

N11 T01 M06 (three word block)

N05 G80 G90 G17 (four word block)

N9 G01 X3.0 Y1.7 F40 (five word block)

Here are two examples of blocks that show an EOB:

N400 G0 X0.2; (three word block with ";" used as an EOB)

N5005 G90 G1 F20 X5 Y2 Z4$ (seven word block with "$" used as an EOB)

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label:CNC, character,word, block, program, address word, g codes, m codes