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AS-I communication

Thread Starter: mucha   Started: 10/31/2009 5:42 PM   Replies: 2

  10/31/2009, 5:42 PM

mucha Joined 9/15/2009 Last visit: 11/7/2011 Posts: 24 Rating:  (0)	(0)  Hi experts, ln our plant we have a newly installed beverage line for soft drinks. certain machines use PLCS S7300 to communicate with the AS-I controller and the AS-I modules using a profibus DP.The make for the AS-I controller and the modules is ifm.How does the sensor/actuator send the signal to the PLC,in short how is the communication done for the machine to function. Regards, mucha.
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  11/2/2009, 12:06 AM

dchartier Joined 9/27/2006 Last visit: 5/21/2013 Posts: 3932 Rating:  (619)

(0)  Hello mucha; I must say I have never worked with ifm efector As-i controllers, although the company's products have always rated very high in my experience; so is the quality of the documentation they offer. So basically the answer that you are looking for should be available on the ifm efector website, for every one of their gateways. For example, I found this document on their website: Siemens Step 7 project with Controller-e. Since we do not have any information on the specific models you are using, you will have to look at more specific information there by yourself. Now you have to understand that the basics of As-i comms are very simple, and very simple to understand. They only occupy 16 words (for 32 As-i slaves) on any specified comm link. So a Profibus-As-i gateway will only reserve the required 2 words in the Profibus-DP master's memory map, where each slave will occupŷ 4 bits (except the first 4 bits, used for diagnostics). Each slave will be mapped to its block of 4 bits depending on the As-i slave address it uses. The document I have pointed to will show you that, even though it might not be for the particular model; of gateway you are using. There are of course more detailled info required to work with a particular model; please refer to the documentation available from your manufacturer. Hope this helps, Daniel Chartier === Edited by dchartier @ 11/2/2009 3:17 AM [GMT ] === === Edited by dchartier @ 11/2/2009 12:49 AM [GMT ] ===

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  11/2/2009, 10:28 AM

mucha Joined 9/15/2009 Last visit: 11/7/2011 Posts: 24 Rating:  (0)	(0)  Hi daniel, Thankyou for the slides concerning AS-I communication and l will get back to you when l need some information concerning the same issue. Regards, mucha
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