Siemens sinumerik 840d Programming Manual page 340

Motion-Synchronous Action
10
10.1 Structure, basic information
840 D 840D
NCU 571 NCU 572
NCU 573
WHEN
WHENEVER
FROM
EVERY
Condition
DO
Action
Coordination of synchronized actions/technology cycles
CANCEL[n]
LOCK[n]
UNLOCK[n]
RESET
Programming example
WHEN $AA_IW[Q1]>5 DO M172 H510
If real-time variables occur in a part program
(e.g. actual value, position of a digital input or output
etc.), preprocessing is stopped until the previous block
has been executed and the values of the real-time
variables obtained.
The real-time variables used are evaluated in
interpolation cycles.
Advantages with synchronized actions:
Preprocessing is not stopped.
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FM-NC 810D 840Di
The condition is tested until it is fulfilled once, the associated action
is executed once.
The condition is tested cyclically. The associated action is executed
cyclically while the condition is fulfilled.
After the condition has been fulfilled once, the action is executed
cyclically while the synchronized action is active.
The action is initiated once when the condition is fulfilled and is
executed again when the condition changes from the FALSE state to
the TRUE state. The condition is tested cyclically. Every time the
condition is fulfilled, the associated action is executed.
Gating logic for real-time variables, the conditions are checked in the
interpolation cycle.
In SW 5 and higher, the G codes can be programmed in
synchronized actions for condition evaluation.
Triggers the action if the condition is fulfilled.
Action started if the condition is fulfilled. e.g. assign variable,
activate axis coupling, set NCK outputs, output M and H functions, ...
In SW 5 and higher, the G codes can be programmed in
synchronized actions for actions/technology cycles.
Cancel synchronized action
Inhibit technology cycle
Enable technology cycle
Reset technology cycle
;If the actual value of axis Q1 exceeds 5 mm, auxiliary
functions M172 and H510 are output to the PLC interface.
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) – 04.00 Edition
12.97
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