Which component of a part program signals the essential function of a word?

Which component of a part program signals the essential function of a word?

• A. Address
• B. N code
• C. G code
• D. Coordinate code

Answer: (A)

In a CNC part program, each word in a block has two parts: a function tag (the address) and a numeric value. The function tag tells the machine what kind of instruction that word is—motion, speed, position, feed, etc.—while the value provides the specific data for that instruction. Because the address communicates what the word is supposed to do, it signals the essential function of the word. The line number (N) just labels blocks and doesn’t define the operation, G codes define the type of preparatory or motion instruction, and coordinate words (like X, Y, Z) supply positions but their meaning is determined by their address.

In a CNC part program, each word in a block has two parts: a function tag (the address) and a numeric value. The function tag tells the machine what kind of instruction that word is—motion, speed, position, feed, etc.—while the value provides the specific data for that instruction. Because the address communicates what the word is supposed to do, it signals the essential function of the word. The line number (N) just labels blocks and doesn’t define the operation, G codes define the type of preparatory or motion instruction, and coordinate words (like X, Y, Z) supply positions but their meaning is determined by their address.