P4: PLC for SINUMERIK 828D
14.3 Programming
Basic Functions
1098 Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Interrupt programs
Interrupt programs are used to be able to handle special process conditions or requirements. The PLC828 makes
a differentiation as follows:
Interrupt programs cannot be renamed, but they can be assigned to data classes.
Exiting program organizational units
As a result of the described program organization (each POU occupies its own tab), it is quite clear where MAIN
and the individual sub and interrupt programs end; this is the reason that they do not require any special end
delimiter.
See also
Addressing Addressing [Page 1102]
Type of memory Type of memory [Page 1099]
Condition Program Description
Shortest response time: Executed in
the servo cycle
INT_0 For extremely fast responses to events, which absolutely required
this. In INT_0, the direct access commands, that either access an
internal, I/O image updated in the servo cycle or only the hardware
of the onboard IO, can be practically used.
Data class: "Manufacturer"
Note:
The size of block INT_0 is limited to 500 operations.
Executed before MAIN, after reading
the inputs
INT_100 Especially to marshal data that is read accessed in the additional
cycle.
Data class: "Individual"
Executed after MAIN, before writing to
the outputs
INT_101 Especially when marshaling data that were previously written in
the PLC cycle, but which should be output to other or additional
outputs.
Data class: "Individual"
The interrupt program is inserted in the
project by double clicking on the
corresponding name in the operation tree:
"Libraries" >"Interrupt programs".
The PLC firmware then automatically makes
the call.
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