Siemens SINUMERIK 840D sl Programming Manual page 642

Motion synchronous actions
10.1 Basics
Further information
Conditions
The condition is a logical expression which can be built up in any way using Boolean
operators. Boolean expressions should always be given in brackets.
The condition is checked in the interpolation cycle.
A G code can be given before the condition. This allows defined settings to exist for the
evaluation of the condition and the action/technology cycle to be executed, independent of
the current part program status. It is necessary to separate the synchronized actions from
the program environment, because synchronized actions are required to execute their
actions at any time from a defined initial state as a result of fulfilled trigger conditions.
Applications
Definition of the systems of measurement for condition evaluation and action through G
codes G70, G71, G700, G710.
A G code specified for the condition is valid for the evaluation of the condition and for the
action if no separate G code is specified for the action.
Only one G code of the G code group may be programmed for each part of the condition.
Possible conditions
● Comparison of main run variables (analog/digital inputs/outputs, etc.)
● Boolean gating of comparison results
● Computation of real-time expressions
● Time/distance from beginning of block
● Distance from block end
● Measured values, measurement results
● Servo values
● Velocities, axis status
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Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
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