Siemens SINUMERIK 840D sl Function Manual page 997

17.5 Starting the tool change
Variants
The tool change can be actuated by:
● T function
● M command (preferably M06).
Parameter setting
Which control versions should be effective is defined with the machine data:
MD22550 $MC_TOOL_CHANGE_MODE
Value
0
1
The M command for tool change is defined in machine data:
MD22560 $MC_TOOL_CHANGE_M_CODE
Default setting is 6 (corresponding to DIN 66025).
Note
If the tool offset number is supplied from the PLC or an HMI tool manager, a block search
stop STOPRE must be inserted at a suitable point. STOPRE must be avoided, however, when
tool radius compensation (G41/G42) or SPLINE interpolation are active, since several blocks
are required here in advance for the path calculation.
References
You will find further information about M functions which also apply to tool change M06 (e.g.
extended address, time of output to PLC, auxiliary function groups, behavior during block
search, behavior during overstore) in:
/FBSY/ Function Manual Synchronized Actions
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Description
The T function loads the new tool immediately.
New tool with T function prepared for change and
placed in the tool change position simultaneously
during the machining time.
The M command is used to remove the old tool
from the spindle and load the new tool.
Tool Change (W3)
Starting the tool change
Typical application
Turning machines with tool turret
Milling machines with a tool magazine,
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