Hello, This is from Resonating Mindz, we are working as system integrator for a German automobile company in India and using the AXCF-2152 as a data concentrator to log the machine data of the production line. How do I read the data blocks of a Seimens PLC using Profinet over the PLCnext. What parameter are the input to the WRREC and RDREC blocks? How do I setup the acyclic Profinet communication?
Hello, There will probably be some setup required on the Siemens side in order to use acyclic Profinet functions to exchange data with DBs in a Siemens PLC, if in fact Siemens supports this feature at all - you will need to check this with Siemens support. On the PLCnext side, a description of the WRREC and RDREC FBs is given in the PLCnext Engineer “Help” system. If you have any specific questions about the information there, please let us know. It would probably be quite a bit easier to simply set up cyclic Profinet comms, with the Siemens PLC as a Profinet Device, and the PLCnext Control as a Profinet Controller. Then, up to 512 bytes of data can be exchanged automatically in each direction, without any need for function block calls. ~ Martin.
Sir, Thank you for the clarification. The data we wish to exchange from the Siemens PLC is not continuous and in a time span of around 40-60 seconds. More to it, the data at present is available in a DB and we are to make a log of the data on a server, hence the preference of acyclic communication. It is expected, that in future, the data may increase and 512 bytes could be insufficient. As per my understanding, any Profinet device has to support acyclic data-exchange, It is a part of the protocol implementation, correct me if wrong. The source of my information: http://us.profinet.com/wp-content/uploads/2012/11/PROFINET_SystemDescription_ENG_2014_web.pdf For the, case of WRREC and RDREC blocks, I wish to know more of what is the “ID” and “Index” parameter. Can I get more explanation for where how could find the value of the same. Regards.
Hello, Sorry for the delay. As mentioned, the WRREC and RDREC functions, including the “ID” and “Index” parameters, are described in the PLCnext Engineer help system. Can you be more specific about what is unclear in this case? ~ Martin.