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SM bit

9/8/2010 11:53 AM	Rate (0)
danac Posts: 10 Rating: (0)	how can i create, for s7-300, bit which would be on only for the first scan cycle?? (like SM0.2 for s7-200)
danac Posts: 10 Rating: (0)
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9/8/2010 1:26 PM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 1/16/2026 Posts: 9105 Rating: (1204)	Dear danac, Please have a look at temporary variables of OB1. in interface of OB. Here you will find the variable: OB1_SCAN_1 Or perhaps make use of OB100 (Startup OB), will only be executed at startup. (To initialize some variables) Hope this will help. Best regards, Wizard

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9/8/2010 2:01 PM	Rate (0)
danac Posts: 10 Rating: (0)	Thank you Wizard!! But i need to create that bit in OB35! is it possible?
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9/8/2010 2:14 PM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 1/16/2026 Posts: 9105 Rating: (1204)	Dear danac, No, that temporary variable is only in OB1. So perhaps you can use OB100. Here you can set a bit (M4.0) And in OB35, you can reset that bit (M4.0) at the end of OB35. So the bit M4.0 will be 1 for one OB35 cycle. Best regards, Wizard

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