Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 486)

Tool Control Functions
Chapter 20
20-2
Figure 20.1
Typical Mill Tool Magazine
06 07 08 09
05 10
04 03 02 01
A T--address followed by a numeric value programs a tool selection (or
tool group number - see section 20.5 on tool life management). The
system installer determines in AMP how a tool change operation is
programmed. There are four different options available. They are:
Return tool in M06 - When this method the T--word to activate is
programmed in a block that does not contain an M06. The T--word is
stored until some later block that contains an M06. When the M06 is
executed the currently active tool is replaced with the last tool number
programmed with a T--word. It is required with this method that the tool
number (or group number) that is being replaced as the active tool is
programmed in the block that contains the M06 command. If the M06
block does not contain the previously active tool number/group number, or
if the wrong tool number/group number is programmed with the M06, the
control will generate an error.
Next tool in T--word - This method is identical to the “Return tool in
M06” method with the exception that the block containing an M06 can not
contain a T--word. It is not necessary to program the previously active tool
number/group number in the M06 block.