Programming - Siemens SINUMERIK 828D Function Manual

9.9.12.3

Programming

User program
End of program
The following must be kept in mind, if the user program is to be activated through the part program start.
• The user program must be ended with M17 or RET.
• A jump back by means of REPOS command is not permitted and leads to an alarm.
Block display
The display can be suppressed in the current block display using the DISPLOF attribute in the PROC statement.
Processing status
Via the user M function the PLC can be informed about the processing status of the event-driven user program.
Scan for triggering event
The event, which causes the activation of the user program, can be queried in the user program with the
following system variable:
$P_PROG_EVENT (event-driven program call active)
Value Description
1 Activation through part program start
2 Activation through part program end
3 Activation through Operator panel reset
4 Activation through Power up
5 Activation after output of the last action block after Block search (see "Automatic start of an
ASUB after a block search [Page 510]")
Query of the current channel
The application program is basically processed in the channel, in which the corresponding event has occurred.
The current channel is queried in the user program with the following system variables:
$P_CHANNO (query of the current channel number)
Note
Power up is an event that takes place in all channels.
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
K1: Mode group, channel, program operation, reset response
9.9 Program operation mode
585