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Weekly Timer in step 7 professional v 12

11/16/2014 7:30 AM	Rate (0)
jebilpk Posts: 7 Rating: (0)	Dear Sirs, Could any one help me out regarding the weekly timer operation in step 7 professional v12? Ineed to run two pumps on alternatively on weekly basis with retention. Many thanks in advance
jebilpk Posts: 7 Rating: (0)
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11/16/2014 8:59 AM	Rate (0)
William_B Posts: 5225 Rating: (1204)	> Which PLC?.. please include also firmware version number.
William_B Posts: 5225 Rating: (1204)
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11/16/2014 9:35 AM	Rate (0)
jebilpk Posts: 7 Rating: (0)	Dear Sir, Iam using CPU 313C-2DP (6ES7 313-6CG04-0AB0) SIMATIC STEP 7 PROFESSIONAL, V12.0.SP1
jebilpk Posts: 7 Rating: (0)	Last edited by: jebilpk at: 11/16/2014 9:37 AM
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11/16/2014 2:45 PM	Rate (0)
eisenpferdreiter Posts: 1058 Rating: (93)	jebilpk Dear Sirs, Could any one help me out regarding the weekly timer operation in step 7 professional v12? Ineed to run two pumps on alternatively on weekly basis with retention. Many thanks in advance Hello jebilpk, I would use SFC64 TIME_TCK for that. The function returns system time in ms. You can easily convert the return value of the function to DINT and add a value for 7 days (10006060247). Thus you get start time for pump and only need to compare with TIME_TCK. And whenever you start one pump you would stop other same time. regards
eisenpferdreiter Posts: 1058 Rating: (93)
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11/16/2014 5:09 PM	Rate (0)
William_B Posts: 5225 Rating: (1204)	Hi. I would go for a Time-Of-Day interrupt (OB10) to trigger an event combined with a read of the time of day when the CPU goes through a power cycle. The problem to keep in mind is that the PLC can loose power. So if you are using traditional timer driven events, you will come into trouble. The design should handle a power outage. Greetings. w
William_B Posts: 5225 Rating: (1204)
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