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maximum frequency of counting ?

Created by: fab65 at: 5/2/2007 10:25 AM (4 Replies)

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5/2/2007 10:25 AM	Rate (0)
fab65 Posts: 7 Rating: (0)	Hello, which is the maximum frequency of counting (without adding specific chart of counting) with a S7 automat S7-300 with the CPU : 314C-2 DP ??
fab65 Posts: 7 Rating: (0)
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5/2/2007 3:40 PM	Rate (1)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 9/14/2023 Posts: 8592 Rating: (1132)	Hi, When you use the integrated countfunctions, the max count frequency is 60 kHz Best regards, Wizard

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5/2/2007 10:24 PM	Rate (0)
fab65 Posts: 7 Rating: (0)	is smaller, non ? 60kHz, it's large frequency without a specific chart of counting.... and, which is the frequence max. with the chart specific for counting ? thank you very much of the answers
fab65 Posts: 7 Rating: (0)
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5/3/2007 9:19 AM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 9/14/2023 Posts: 8592 Rating: (1132)	fab65 is smaller, non ? 60kHz, it's large frequency without a specific chart of counting.... and, which is the frequence max. with the chart specific for counting ? thank you very much of the answers Hello, Sorry for the misunderstanding When you don't use any integrated count functions, you can parametrize the input delay time of the inputs. Standard it's 3 ms, but you can choose between 0,1ms, 0,3ms, 3ms and 15ms When you use the integrated count functions, the max count frequency is 60 kHz Best regards, Wizard

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5/3/2007 5:25 PM	Rate (0)
Denilson Pegaia Platinum Member Joined: 9/23/2005 Last visit: 9/26/2023 Posts: 4237 Rating: (1366)	Hi, there is three types of solution: 1 - Using standard IO and standard program (OB1). In this case you need to see the time response of the digital input module and the program cicle. For example, if you have 100ms of OB1 you will not read frequences higher as 1/(2100ms) = 5Hz. 2 - Using IO with process interruption and a interruption program (OB40). Be carreful because it can enlarge the OB1 prossessing too much! In this case you need to see the interrupt processing time of CPU and the response of the digital input module. If a module has filter/delay of 10ms then the frequence will be 1/(210ms)=50Hz. 3- Using dedicated hardware: In this case take a look on the specification of the module and the used sensor (for example FM350-1 can read up to 500kHz).
	Denilson Pegaia Siemens Industry Sector Technical Support
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