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s7 300 and hmi on profibus

9/11/2012 10:23 AM	Rate (0)
er.chintan Posts: 4 Rating: (0)	i use profibus cable to communicate s7 300(315 2 pn/dp )with HMI (op 177b) .IN HMI timer values not show perfectly in plc it show perfect value .....so what is problem???????
er.chintan Posts: 4 Rating: (0)
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9/11/2012 12:52 PM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 3/27/2025 Posts: 8912 Rating: (1187)	Hello, Do you get any value? What is cycle time of the used tag? Do you update the tag when used in screen or continuous? Best regards, Wizard

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9/11/2012 1:27 PM	Rate (0)
er.chintan Posts: 4 Rating: (0)	yes i get value but some time the second jumps like 7 to direct 9.. abd tag scan time is 1 sec. and the mode is cyclic on use
er.chintan Posts: 4 Rating: (0)	Last edited by: er.chintan at: 9/11/2012 1:30 PM
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9/11/2012 2:26 PM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 3/27/2025 Posts: 8912 Rating: (1187)	Hello, Have you tried to use a Cycle update time of 500ms? (or even lower) Best regards, Wizard

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9/11/2012 4:30 PM	Rate (0)
er.chintan Posts: 4 Rating: (0)	yes tried 500 ms but some time the speed of timer increase only for 1 sec but it show continus time.....is there any scan time configuraton require for profibus?????
er.chintan Posts: 4 Rating: (0)
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9/12/2012 9:08 AM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 3/27/2025 Posts: 8912 Rating: (1187)	Hello, Perhaps this link might help: Determining the transfer time for typical configurations in PROFIBUS Best regards, Wizard

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