Siemens SINUMERIK 840Di Function Manual page 1688

Detailed Description
2.1 Tool
Cutting edge number CE
When you rename D numbers, the information in the tool catalog detailing the numbers
defined for these cutting edges is lost. It is, therefore, impossible to determine, following
renaming, which cutting edge of the catalog is being referenced.
Since this information is required for retooling procedures, a cutting edge number CE has
been introduced for each cutting edge. This number remains stored when the D number is
renamed.
The D number identifies the cutting edge compensation in the part program. This
compensation number D is administered separately from the cutting edge number CE (the
number in the tool catalog). Any number can be used. The number is used to identify a
compensation in the part program and on the display.
The CE number identifies the actual physical cutting edge during retooling. The cutting edge
number CE is not evaluated by the NCK on compensation selection during a tool change
(only available via the OPI).
The cutting edge number CE is defined with system variable $TC_DPCE[t,d]:
• t stands for the internal T number.
• d stands for the D number.
Write accesses are monitored for collisions, i.e., all cutting edge numbers of a tool must be
different. The variable $TC_DPCE is a component of the cutting edge parameter data set
$TC_DP1 to $TC_DP25.
It is only practical to parameterize $TC_DPCE if the maximum cutting edge number
(MD18105) is greater than the maximum number of cutting edges per tool (MD18106).
In this case, the default cutting edge number is the same as the classification number of the
cutting edge. Compensations of a tool are created starting at number 1 and are incremented
up to the maximum number of cutting edges per tool (MD18106).
If
MD18105 ≤ MD18106,
the CE cutting edge number is equal to the D number
(for compatibility with the previous response).
A read operation returns CE=D. A write operation is ignored without an alarm message.
Note
The compensation values $TC_DP1 to $TC_DP25 of the active tool compensation can be
read with system variable $P_AD[n], where n=1 to 25. The CE cutting edge number of the
active compensation is returned with n=26.
2-8
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Tool Compensation (W1)