Automation– and Drive Technology- SCE
T I A Training document Page 3 of 32 Appendix III
Last revision: 02/2002 Basic programming instructions LAD/FBD/STL in STEP 7
PAGE:
1. Forward........................................................................................................ 5
2. Basic Programming Instructions................................................................... 6
2.1 Assignment .................................................................................................... 6
2.2 AND - Operation.............................................................................................. 6
2.3 OR - Operation................................................................................................ 7
2.4 AND - before OR - Operation ............................................................................ 7
2.5 OR - before AND - Operation ............................................................................ 8
2.6 Query on signal state 0.................................................................................... 9
2.7 Exclusive - OR - Operation............................................................................... 9
2.8 Query of outputs ............................................................................................. 10
2.9 R- S – Storage functions .................................................................................. 10
2.9.1 Reset dominant............................................................................................... 11
2.9.2 Set dominant .................................................................................................. 11
2.10 Edge Operations........................................................................................... 12
2.10.1 Positive Edge (FP) .......................................................................................... 12
2.10.2 Negative Edge (FN) ......................................................................................... 13
2.11 Timer Functions............................................................................................ 14
2.11.1 Release timer (FR) only in STL ......................................................................... 14
2.11.2 Start timer (SI/SE/SD/SS/SF) .......................................................................... 14
2.11.3 Timer Value (TV)............................................................................................. 15
2.11.4 Reset timer (R) ............................................................................................... 15
2.11.5 Load timer (L/LC) ............................................................................................ 15
2.11.6 Query signal state of timer (Q).......................................................................... 16
2.11.7 Pulse timer (SI)............................................................................................... 16
2.11.8 Extended pulse timer (SE)............................................................................... 17
2.11.9 On-delay timer (SD)......................................................................................... 18
2.11.10 Retentive On-delay timer (SS) .......................................................................... 19
2.11.11 Off-delay timer (SF) ......................................................................................... 20
2.12 Clock Pulse Generators................................................................................ 21
