P4: PLC for SINUMERIK 828D
14.6 Function interface
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
1195
14.6.5 Starting ASUBs
ASUBs (asynchronous subprograms) are NC programs that can be started at any time from the PLC. In this
sense, regarding the NC, they are interrupt programs, as the NC program being executed is interrupted by the
ASUB.
Precondition is that the ASUB is selected and parameterized using an NC program or using the → PI service
ASUB. (By executing the PI service ASUB with the appropriate PI index, one of the two interrupts 1 or 2 is
assigned the ASUB intended for the purpose.)
Only one ASUB can be started at one time. If, in a PLC cycle, both start signals of the function interface
described below are set to a logical 1, then the ASUBs are started in the sequence in which they are called. The
user must set the start signal to a logical 0 if an acknowledgement was set in the interface for the job result.
Note
It is not permissible that a start signal is set:
• If the PI service ASUB has not been completed.
• if DB2600.DBX0.1 (Emergency Stop) is set.
• During a request for a channel reset by the PLC.
The ASUB can only be restarted if the channel is in the reset state and IS
DB3300.DBX3.7 (channel state reset) is set.
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