Siemens SINUMERIK 808D ADVANCED Training Manual page 82

PLC program
design and
adjustment
Operation symbols of PLC programming language
Special markers
PLC scan period
always "1" state
SM0.0
PLC scan at
SM0.1
Buffer data loss
SM0.2
System restarts
SM0.3
2 x PLC scan period
SM0.6
1 second pulse
SM0.5
1 minute pulse
SM0.4
Commissioning Guide
Special marker register can simplify the de-
0.5 second 0.5 second
30 seconds
sign of PLC application program
Page 82
s
30 seconds
808D ADVANCED Turning and Milling