Siemens SINUMERIK 840D

10
Motion-Synchronous Action 12.97
10.3 S
p
ecial real-time variables for s
y
nchronized actions
10
840D
NCU 572
NCU 573
810D
CCU2
840Di

Siemens AG 2000. All rights reserved
10-354
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) – 04.00 Edition
n: Number of the timer variable
value: Starting value (usually 0)
•
Halt timer
Incrementation of a timer variable is halted by
assigning a negative value $AC_TIMER[n]=–1
•
Read timer
The current time value can be read when the
timer is running or when it has stopped. When
the timer is stopped by assigning the value –1,
the most up-to-date timer value is retained and
can be read.
Example:
Output of an actual value via analog output
500 ms after detection of a digital input
WHEN $A_IN[1] == 1 DO $AC_TIMER[1]=0
; Reset and start timer
WHEN $AC_TIMER[1]>=0.5 DO $A_OUTA[3]=$AA_IM[X] $AC_TIMER[1]=-1
10.3.3 Synchronized action parameters $AC_PARAM[n]
Function
Data type: REAL
n: Number of parameter 0–n
synchronized action parameters $AC_PARAM[n] are
used for calculations and as a buffer in the
synchronized actions.
The number of available AC parameter variables per
channel are defined using machine data MD 28254:
MM_NUM_AC_PARAM.
The parameters are available once per channel
under the same name. The $AC_PARAM flags are
stored in the dynamic memory.