Siemens Simatic S7-400

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Warranty, Liability and Support

Time switch based on the S7-300/400 CPUs with simple HMI system

including radio-controlled clock connection

Rev. B - final 19.07.2002 5/84

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

5.2.2 Load the application software into the panel .................................................. 51

6 Using the Application................................................................................... 54

6.1 Application case 1: Many time switches ........................................................ 54

6.2 Application case 2: Pulse chain..................................................................... 63

Part C: Program Description ..................................................................................... 70

7 STEP 7 Program............................................................................................ 71

7.1 Absolute time switches ................................................................................... 71

7.1.1 Seven-day time switch.................................................................................... 71

7.1.2 One-month time switch................................................................................... 71

7.2 Relative time switch........................................................................................ 73

1.2 Special functions............................................................................................. 74

7.2.1 Summer/wintertime changeover..................................................................... 74

7.2.2 Holidays/special days ..................................................................................... 75

8 HMI Interface ................................................................................................. 77

9 Changes in the STEP 7 Programs............................................................... 77

9.1 What to do if a second time switch of the same type is needed?................... 77

9.2 How can I get several switch-on/off times into one time switch block?........... 78

9.3 What to do if more holidays or special days are needed?.............................. 79

9.4 How can I save on Instance DBs?.................................................................. 80

Appendix: Connection of the SICLOCK radio clock ............................................... 81

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