Siemens SINUMERIK 804D sl

Fundamentals
15.5 PLC program
CNC Part 1 (NCK, PLC, drive)
Commissioning Manual, 11/2006, 6FC5397-2AP10-2BA0
275
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Figure 15-6 PLC program structure
PLC status
The PLC always starts up in RESTART mode, i.e. the PLC operating system runs OB100
after initialization and starts cyclic operation at the beginning of OB1. There is no re-entry at
the point of interruption (e.g. on power failure).
Start-up behavior of the PLC
There are both remanent and non-remanent areas for the markers, times and counter. The
areas are continuous and are divided by a parameterizable limit, where the area with the