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s7-1200 ob1 initial call bit

Created by: Rivas at: 9/12/2014 2:50 PM (5 Replies)

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9/12/2014 2:50 PM	Rate (0)
Rivas Experienced Member Joined: 6/20/2011 Last visit: 11/28/2023 Posts: 72 Rating: (7)	can i use this bit as an fisrtscan bit ? is this only 1 during the first cycle ?

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9/12/2014 3:04 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 12/9/2023 Posts: 13994 Rating: (2283)	Rivas can i use this bit as an fisrtscan bit ? is this only 1 during the first cycle ? What bit are you talking about? If you go into the s7-1200 device properties and configure the system/clock memory and enable the system memory bits, one of them is the first scan bit. You can also create a first scan OB which is perfect for startup and reset operations. No bit required.
	science guy
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9/12/2014 3:04 PM	Rate (0)
Kelu Posts: 88 Rating: (12)	Hello Rivas, About which bit do you speak exactely? If you looking for use a bit active only during the first scan, you can SET a bit in OB100 and reset this same bit at the end of your OB1. Rgrs,
Kelu Posts: 88 Rating: (12)
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9/12/2014 3:38 PM	Rate (0)
Rivas Experienced Member Joined: 6/20/2011 Last visit: 11/28/2023 Posts: 72 Rating: (7)	See the Picture 2 bits are programmed as inputs on OB1 Attachment OB1.jpg (1399 Downloads)

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9/12/2014 3:53 PM	Rate (0)
Kelu Posts: 88 Rating: (12)	Yes "Initial_Call" should be the first scan bit.
Kelu Posts: 88 Rating: (12)
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9/12/2014 4:16 PM	Rate (0)
Rivas Experienced Member Joined: 6/20/2011 Last visit: 11/28/2023 Posts: 72 Rating: (7)	Oke thanks.....

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