Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 315)

Introduction to Programming
Chapter 10
10-41
A T--address followed by a numeric value programs a tool selection.
When the control executes the T--word, it outputs a tool selection signal to
a tool changer. The tool changer should perform a sequence of operations
to deliver the proper tool in response to the tool selection signal. For
example, to select a cutting tool that is assigned tool number “03”, write
“T03” in the part program. The system installer may require a M06 in the
program to cause a tool change.
Since tool changers vary in style, size and function, the system installer is
responsible for specific implementations through PAL. Refer to your PAL
reference manual and the manual supplied by the system installer for more
details.
Important: When changing cutting tools it is usually necessary to change
the tool offset at the same time. This is done with an H-- or a D--word. For
details see section 10.5.3
Important: When the MISCELLANEOUS FUNCTION LOCK feature is
activated, the control displays M--, B--, S--, and T--words in the part
program with the exception of M00, M01, M02, M30, M98, and M99.
This feature is described in chapter 7.
END OF CHAPTER