Siemens SINUMERIK 840D sl Function Manual page 299

The current wheel width is usually determined through the dressing cycle and can be entered
in parameter $TC_TPG5 of a grinding tool. If monitoring is active, this entered value is
compared to the value in parameter $TC_TPG4 (minimum wheel width).
If the current wheel radius falls below the value specified in the parameter $TC_TPG3 or the
current wheel width ($TC_TPG5) falls below the value defined in the parameter $TC_TPG4, the
control sets the following NC/PLC interface signal to "1":
DB31, ... DBX83.3 (geometry monitoring) == 1
Note
There is no controller-internal error response.
Speed monitoring
The speed monitor checks the grinding wheel peripheral speed in m/s (parameter $TC_TPG7)
as well as the maximum spindle speed in rpm (parameter $TC_TPG6).
The speed setpoint is monitored against the speed limitation cyclically with allowance for the
spindle override.
The speed limit is the smaller value resulting from the comparison of the maximum spindle
speed with the speed calculated from the maximum wheel peripheral speed and the current
wheel radius.
The speed limit value is recalculated:
● if monitoring is switched on
● if online correction values (wear parameters) are changed
When the speed limit value is reached, it is restricted to the speed limit value and the following
NC/PLC interface signal is set to "1":
DB31, ... DBX83.6 (speed monitoring) == 1
Note
There is no controller-internal error response.
Activation / deactivation
Activation/deactivation of grinding-specific tool monitoring is done by programming
of TMON(...)/TMOF(...) (Page 300) in the part program.
Tools
Function Manual, 06/2019, A5E47435126B AA
W4: Grinding-specific tool offset and tool monitoring
4.4 Grinding-specific tool monitoring
299