Criteria For Stroke Initiation - Siemens SINUMERIK 840D sl Function Manual

The chronological sequence of events for punching and nibbling is controlled by the two
signals A
A
0
E
0
The signal states characterize and define times t
t
1
t
2
t
3
t
4
Note
The stroke time is determined by the period Δt
Reaction times at instant t
motion must also be added.
10.2.3

Criteria for stroke initiation

Initiate a stroke
The stroke initiation must be set, at the earliest, for the point in time at which it can be
guaranteed that the axes have reached a standstill. This ensures that at the instant of
punching, there is absolutely no relative movement between the punch and the metal sheet
in the machining plane.
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
and E :
0 0
Set by the NCK and identical to stroke initiation.
Defines the status of the punching unit and identical to the "Stroke active" signal.
The motion of the workpiece (metal sheet) in relation to the punch is completed at instant t
Depending on the criterion defined for stroke initiation (refer to "Criteria for stroke initiation"),
high-speed output A is set for punch initiation ①.
0
The punching unit signals a punch movement via high-speed input E
This is triggered by signal A
For safety reasons, signal E
always set and the axes do not move).
The "Stroke active" signal is not reset again until the tool has moved away from the metal
sheet (t ).
4
The NC reacts to the "Stroke active" signal at instant t
signal ③. From this point in time onwards, the NC is in a waiting state. It simply waits for
cancellation of the "Stroke active" signal so it can initiate the next axis motion.
The next stroke can be initiated only after signal A
The punching operation is complete at instant t
again.
The NC reacts to a signal transition in signal E
The reaction of the NC to a signal edge change ④ is described in the section headed "Axis
start after punching".
between the signal transition of E
4
N4: Punching and nibbling - only 840D sl
to t
1 4
②.
0
is high-active (in the case of an open circuit, "Stroke active" is
0
has disappeared.
0
, i.e. the punch has exited from the metal sheet
4
by starting an axis motion ④.
0
= t - t
h 4 1
10.2 Stroke control
in the following way:
at instant t
0
by canceling the "Stroke initiation"
3
.
and the start of the axis
0
.
1
.
2
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