Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 280)

Introduction to Programming
Chapter 10
10-6
Each machining operation performed by the control is determined by the
control’s interpretation of a group of words (commands) called a “block.”
Individual blocks in a part program define each machining process. Part
programs consist of a number of blocks that together define a complete
operation on a part.
Part program blocks are made up of:
characters ---- A character is a number, a letter, or a symbol that has a
specific meaning for the control. For example, 1, G, ; are characters
the control recognizes as meaningful information
addresses ---- An address is a letter that defines the instruction for the
control. Examples of addresses are: G, X, Z, F
words ---- A word consists of an address followed by a numeric value.
Examples of words are: G01, X10.5, F50., M2. Each word requires a
specific format for its numeric part. These formats are given in section
10.5
codes ---- There are industry standards for many of the G and M--codes
used here.
parameters ---- The control has a number of fixed cycles that are
initiated by a specific G--code. Other words appearing in those G--code
blocks are referred to as “parameters”, because their values are relevant
only to that G--code. For example, a Z--word generally refers to a Z axis
move, but when it appears in a block with a G83 peck drilling cycle, its
value refers to the depth of the hole to be drilled. In that case, it is a
“parameter” of the G83 fixed cycle
A block is a set of words and characters that define the operations of the
control. For example:
/ N3 G00 X10. Z10. M3 ;
end of block character
miscellaneous function word
(spindle on forward)
axis movement words
preparatory function word
(rapid positioning mode)
sequence number word
optional block delete character
10.2
Program Configuration