Tool Life Monitoring - Siemens SINUMERIK 802D sl Function Manual

System variables for active tool
The following can be read in the NC program via system variables:
● $P_TOOLNO: Number of the active tool T
● $P_TOOL: Active D number of the active tool
Interface signals
Some monitoring conditions are made available to the PLC:
● "Tool pre-warning limit reached" (V5300 0000.0)
● "Tool limit reached" (V5300 0000.1)
● "T number for tool pre-warning limit" (VD5300 1000)
● "T number for tool limit" (VD5300 1004)
The workpiece counter can be turned off from the PLC:
● "Turn off workpiece counter" (V3200 0013.5)
25.4.2

Tool life monitoring

Tool life monitoring is done for the tool cutting edge that is currently in use (active cutting
edge D of the active tool T).
As soon as the path axes traverse (G1, G2, G3, ... but not for G0), the residual tool life
($TC_MOP2[t,d] ) of this tool cutting edge is updated. If the remaining service life of the
cutting edge of a tool falls below the value of "Service life prewarning limit" ($TC_MOP1[t,d])
during machining, the IS "Tool prewarning limit reached" (V5300 0000.0) and the IS "T
number for tool prewarning limit" (VD5300 1000) are set.
If the remaining service life <= 0, an alarm is issued and the IS "Tool limit reached" (V5300
000.1) as well as the IS "T number for tool limit" (VD5300 1004) are set. The tool changes to
the "disabled" condition and cannot be programmed again until this condition changes. The
operator must intervene and ensure that an operational tool for machining is provided.
$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.
After control system power-up, Reset / End of program, the $A_MONIFACT factor has the
value 1.0. Real time is in effect. Examples for accounting:
● $A_MONIFACT=1: 1 minute real time = 1 minute tool life which is decremented
● $A_MONIFACT=0.1: 1 minute real time = 0.1 minute tool life which is decremented
● $A_MONIFACT=5: 1 minute real time = 5 minute tool life which is decremented
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0
Tool: Compensation and Monitoring (W1)
25.4 Tool monitoring
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