Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 490)

Tool Control Functions
Chapter 20
20-6
Use these formats for programming G43 or G44:
G43H__;
G44H__;
(“H” is the tool offset number.)
G43 or G44 does not have to be programmed with an H--word in the same
block, or vice versa, in order for a tool offset to be made active. But the
tool offset will only be activated at the time both a G--word and H--word
are active.
Important: If using the tool life management feature, programming a
H--word may not be necessary. (See section 20.5 for details on tool life
management).
Depending on how the system installer has configured AMP, tool offsets
may remain active after “end of program commands” (M02 or M30) are
executed, a “control reset” is performed or E-STOP is reset.
Example 20.1 and Figure 20.4 illustrate offset program blocks and how
they affect tool position.
Example 20.1
Programming G43 or G44
Assume H01 offset data to be 15
Assume H02 offset data to be -15
G91G00Z-100.G43H00; (Case 1)
G91G00Z-100.G43H01; (Case 2)
G91G00Z-100.G44H02; (Case 3)