Siemens SINUMERIK 840D sl Function Manual page 742

Punching and Nibbling (N4)
Stroke control
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.
742
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
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
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
in the following way:
at instant t
0
by canceling the "Stroke initiation"
3
.
and the start of the axis
0
.
1
.
2
Extended Functions