Siemens SINUMERIK 840D sl Function Manual page 740

Punching and Nibbling (N4)
Stroke control
10.2 Stroke control
10.2.1 General information
Functionality
The stroke control is used in the actual machining of the workpiece. The punch is activated
via an NC output signal when the position is reached. The punching unit acknowledges its
punching motion with an input signal to the NC. No axis may move within this time period.
Repositioning takes place after the punching operation.
High-speed signals
"High-speed signals" are used for direct communication between the NC and punching unit.
Combined with the punch, they allow a large number of holes to be punched per minute
since the punch positioning times are interpreted as machining delays.
PLC signals
PLC interface signals are used for non-time-critical functions such as enabling and
monitoring.
10.2.2 High-speed signals
Functionality
High-speed signals are used to synchronize the NC and punching unit. On the one hand,
they are applied via a high-speed output to ensure that the punch stroke is not initiated until
the metal sheet is stationary. On the other, they are applied via a high-speed input to ensure
that the sheet remains stationary while the punch is active.
The high-speed digital inputs and outputs on the control are used to drive the punching unit.
The following signal chart illustrates the signal sequence.
740
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions