External Switch Request - Siemens SINUMERIK 840D sl Function Manual

M5: Measurement
8.7 Simulated measuring
If several axes are programmed in a measuring block, then a dedicated switching position is
obtained for each axis by the position offset that is axially taken into consideration. The probe
signal is generated at the first axial switching position that is reached.
Note
Probe signals
The probe signals are always simultaneously generated for probes 1 and 2.
Negative offset values
The switching position is shifted behind the end position by entering a negative value for the
position offset. In this case, no probe signals are generated.
Examples
The position offset is set to 0.1 mm: MD13231 $MN_MEAS_PROBE_OFFSET = 0.1
Example 1: Channel-specific measuring in 2 axes
Program code
N10 G01 G90
N20 MEAS=1 X100 Y10 F100
Example 2: Axial measuring using synchronized action
Program code
N10 G01 G90
N15 WHEN TRUE DO MEASA[X]=(1,1)
N20 X10 F100
8.7.3

External switch request

Function
The "external switching request" is selected using the NCK specific machine data by entering
the number (1...8) of the digital output being used:
● MD13230 $MN_MEAS_PROBE_SOURCE = <number of the digital output>
The probe signal is triggered by controlling the configured digital output. It is not necessary to
hard-wire the digital output to a measuring input.
The rising edge of the switching signal for probes 1 and 2 is generated by setting the digital
output. The falling edges are generated by resetting the digital output.
580
Comment
; rising edge, probe 1
; Switching position[X] = 99.9
; Switching position[Y] = 9.9
Comment
; rising edge, probe 1
; Switching position[X] = 9.9
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions