Measurement Accuracy And Functional Testing; Measurement Accuracy; Probe Function Test - Siemens SINUMERIK 840D sl Function Manual

8.6

Measurement accuracy and functional testing

8.6.1

Measurement accuracy

The measuring accuracy is affected by the following parameters:
● Delay time of the measuring signal (T
● Traversal speed during the measurement (v
Delay time compensation of the measuring signal (T
The delay time of the measuring signal, i.e. the time from the initiation of the probe until the
saving of the measured value in the control depends on the response time of the probe and
the signal runtime of the control hardware. The control compensates for the delay time during
the measurement. This requires that the delay time is determined and entered in the following
machine data:
MD13220 $MN_MEAS_PROBE_DELAY_TIME = <determined delay time>
Note
Maximum compensated delay time T
T
MaxDelay
The compensation of a delay time > T
means larger values are limited to T
Maximum traversal speed during the measurement (v
The maximum permitted traversal speed for a measurement depends on the number of
programmed measuring edges and the parameterized position-controller or DP cycle.
To receive correct results, the traversal speed during the measurement must be chosen so
that the following conditions are satisfied every two position-controller or DP cycles:
● Maximum one identical trigger signal, i.e. one positive or one negative edge of one probe
● Maximum four different identical trigger signals, i.e. one positive and one negative edge of
two probes
8.6.2

Probe function test

Example of function test
Table 8-8
Program code
%_N_PRUEF_MESSTASTER_MPF
;$PATH=/_N_MPF_DIR
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
= 15 * position controller or DP cycle
8.6 Measurement accuracy and functional testing
)
Delay
)
M
)
Delay
MaxDelay
is not sensible from the control viewpoint. This
MaxDelay
.
MaxDelay
)
M
Comment
M5: Measurement
577