Programming
8.11 Language commands for tool monitoring
8-190
SINUMERIK 802D sl Operation and Programming Nibbling (BP-N), 06/2006 Edition
6FC5 398-3CP10-0BA0
System variables for tool monitoring data
Table 8-3 Tool monitoring data
Identifier
Description Data type Default value
!
" !
# $ %&
' () %&
!!! !!!
* !
# + () * %& 0
t for tool number T, d for D number
System variables for active tool
The following can be read in the NC program via system variables:
S $P_TOOLNO – number of the active tool T
S $P_TOOL – active D number of the active tool
8.11.2 Tool life monitoring
Tool life monitoring is performed for the tool cutting edge that is currently in use (active cut-
ting edge D of the active tool T).
Once the axes traverse (G1,G2, G3, ... but not for G0), the residual tool life
($TC_MOP2[t,d]) of this tool cutting edge is updated. When the remaining tool life of a cut-
ting edge is taken as the “Tool life warning” ($TC_MOP1[t,d] ) value during machining it is
indicated to the PLC using an interface signal.
If the remaining tool life is <
0, an alarm is issued and an additional interface signal set. The
tool changes to the “disabled” condition and cannot be programmed again until this condition
changes. The operator must intervene: The operator must change the tool or ensure that he
has an operational tool for machining.
$A_MONIFACT system variable
The $A_MONIFACT system variable (REAL data type) allows the monitoring clock to be run
slower or faster. This factor can be set before using the tool, in order to take the different
kinds of wear into consideration according to the workpiece material used, for example.
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