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

8.5

Measurement accuracy and functional testing

8.5
8.5.1

Measurement accuracy

Accuracy
The propagation time of the measuring signal is determined by the hardware used.
The delay times when using SIMODRIVE 611D are in the 3.625 μ ... 9.625 μ range plus the
reaction time of the probe.
The measurement uncertainty is therefore:
Measurement uncertainty = propogation time of the measurement signal x traversing velocity
The allowed traversing velocities depend on the number of programmed measurement
edges and the relation between the IPO/position control clock cycle.
Correct results only comply to traversing velocities for which not more than 1 equal and not
more than 4 different trigger signals per position control clock cycle arrive.
8.5.2

Probe functional testing

Example of function test
%_N_PRUEF_MESSTASTER_MPF
;$PATH=/_N_MPF_DIR
;Testing program probe connection
N05 DEF INT MTSIGNAL
N10 DEF INT ME_NR=1
N20 DEF REAL MESSWERT_IN_X
N30 G17 T1 D1
N40 _ANF: G0 G90 X0 F150
N50 MEAS=ME_NR G1 X100
N60 STOPRE
N70 MTSIGNAL=$AC_MEA[1]
N80 IF MTSIGNAL == 0 GOTOF _FEHL1
N90 MESSWERT_IN_X=$AA_MW[X]
N95 M0
N100 M02
N110 _FEHL1: MSG ("Probe not switching!")
N120 M0
N130 M02
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
8.5 Measurement accuracy and functional testing
; Flag for trigger status
; measurement input number
; tool compensation for
; preselect probe
; starting position and
; measuring velocity
; measurement at measurement input =1
; in the X axis
; read software switching signal
; at 1st measurement input
; Evaluation of signal
; Read in measured value of
; workpiece coordinates
M5: Measuring
685