Action (Do); System Variables For Synchronized Actions - Siemens SINUMERIK 840D sl Function Manual
Synchronized actions
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3.3 System variables for synchronized actions
G commands
The following G commands are permissible:
● G70 (Inch dimensions for geometric specifications (lengths))
● G71 (Metric dimensions for geometric specifications (lengths))
● G700 (Inch dimensions for geometric and technological specifications (lengths, feedrate))
● G710 (Metric dimensions for geometric and technological specifications (lengths, feedrate))
Validity
A G command programmed in the condition part also applies for the action part even if no G
command has been programmed in the action part itself.
A G command programmed in the action part only applies within the action part.
3.2.6
Action (DO)
The action part of a synchronized action is initiated with the keyword DO.
One or more actions can be programmed in the action part. These are executed when the
appropriate condition is fulfilled. If several actions are programmed in one synchronized action,
they are all executed in the same interpolator clock cycle.
Example:
If the actual value of the Y axis is greater than or equal to 35.7, the auxiliary function M135 is
output on the PLC and, at the same time, digital output 1 = 1 is set.
Program code
WHEN $AA_IM[Y] >= 35.7 DO M135 $A_OUT[1]=1
Technology cycle
A technology cycle can be called as an action (see Section "Technology cycles (Page 116)").
3.3
System variables for synchronized actions
The system variables of the NC are listed in the "System Variables" Parameter Manual with
their respective properties. System variables that can be read or written in synchronized
actions, are marked with an "X" in the corresponding line (Read or Write) of the "SA"
(synchronized action) column.
Note
System variables used in synchronized actions are implicitly read and written synchronous to
the main run.
20
Function Manual, 08/2018, 6FC5397-5BP40-6BA2
Synchronized actions
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