Siemens SINUMERIK 840D sl Function Manual page 687

Interrupt routines/ASUBs
Term
Identical functionality is identified by the terms ASUB and Interrupt routines. In the following
text therefore, only the term interrupt routine is now used.
• Interrupt routines are normal part programs, which are started by interrupt events
• Where several interrupt routines exist, they have to be given different levels of priority so
• Interrupt routines can be activated from the PLC program by means of a "Function call".
Interrupt signals
A total of 8 interrupt signals are available.
All inputs can be controlled via the PLC.
The first four interrupt signals are also controlled via the 4 rapid NC inputs of the NCU
module (X121).
The signal status of the rapid NC inputs can be read out via the PLC interface (DB10).
The transmission of the rapid NC input signals to the interrupt signals can be disabled via the
PLC interface (DB10).
Figure 2-12
For further information about PLC control of the rapid NC inputs (interrupt signals) see:
References:
/FB1/ Function Manual, Basic Functions, Basic PLC Program (P3)
/FB2/ Function Manual for Extended Functions; Digital and Analog NCK I/Os (A4)
Basic logic functions: Mode group, channel, program operation, reset response (K1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
(interrupt inputs, process or machine status) related to the machining process or the
relevant machine status. Any part program block currently being executed will be
interrupted by the routine if it is not specifically declared to be locked against interruption.
It is possible to continue the subroutine at the point of interruption at a later stage.
that incoming activation signals arriving at the same time can be placed in a certain order.
4 rapid NC inputs
4 interrupt signals
Interrupt signals
PLC interface
4 interrupt signals
Detailed description
2.7 Program operation mode
129