M5: Measurement
7.6 Measurement accuracy and functional testing
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
523
7.6 Measurement accuracy and functional testing
7.6.1 Measurement accuracy
The measuring accuracy is affected by the following parameters:
● Delay time of the measuring signal (T
Delay
)
● Traversal speed during the measurement (v
M
)
Delay time compensation of the measuring signal (T
Delay
)
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
MaxDelay
T
MaxDelay
= 15 * position controller or DP cycle
The compensation of a delay time > T
MaxDelay
is not sensible from the control viewpoint. This
means larger values are limited to T
MaxDelay
.
Maximum traversal speed during the measurement (v
M
)
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
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