CNC Threading and Machining Practice Test

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In CNC programming, which term designates the numeric block number at the start of a program line?

N code

Line numbering in CNC programs uses a numeric block prefix. The numeric block number at the start of a program line is indicated with an N followed by a number (for example, N10, N20). This N-number helps you reference and edit specific blocks, and it can be useful for program checks and subprogram references. The actual instruction that performs motion or other actions inside the line is the G-code portion (like G00 or G01), not the line’s prefix. Other terms don’t denote the line prefix in standard CNC terminology. So the correct designation for the numeric block number at the start of a program line is N code.

G code

Coordinate code

Address