M5: Measurement
7.4 Axial measurement
Extended Functions
448 Function Manual, 03/2013, 6FC5397-1BP40-3BA1
FIFO variables
The axial measured values are available in the machine coordinate system (MCS). They are
stored in the circular buffer (FIFO) specified by MEAC. The measured values are entered in
FIFO variables in the FIFO using the circular principle, e.g. $AC_FIFO1. When two probes
have been projected for the measurement, the measured values of the second probe are
saved separately in the subsequent FIFO.
The number of measured values is limited. The length of the FIFO can be configured in the
following machine data:
MD28264 LEN_AC_FIFO (length of the FIFO variables $AC_FIFO1 - $AC_FIFO10)
The values can be read from the FIFO both in the part program and from synchronized
actions.
The measurement remains active until:
● MEAC[axis]=(0) is programmed
● a FIFO is full
● RESET is pressed or end of program M02/M30 is reached
References:
Function Manual, Synchronized Actions; Detailed Description,
Section: Parameters ($AC_FIFO)
Probe status
It is possible to scan the probe status directly in the part program and in synchronized
actions.
$A_PROBE[n] where n= probe
$A_PROBE[n]==1: Probe deflected
$A_PROBE[n]==0: Probe not deflected
Probe limitation
The probe limitation is available at the following system variables for PROFIBUS telegram
395:
$A_PROBE_LIMITED[n], where n = probe
$A_PROBE_LIMITED[n]==1: Probe limitation active
$A_PROBE_LIMITED[n]==0: Probe limitation inactive/reset
For additional information on system variables, see:
Reference:
Parameter Manual, System Variables
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