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| 4/25/2012 6:39 PM | |
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Posts: 63 Rating:
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I have ascon temperature controllers connected to the Modbus. I need a STEP 7 code that manages these Ascon : read and write the desired temperature? thanks |
| 4/26/2012 1:31 AM | |
Joined: 9/27/2006 Last visit: 3/20/2025 Posts: 12344 Rating:
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Hello soussia; Unless Ascon provides the code on their website, or you are lucky enough to find a member here who has done such an application and is willing to share it, I am afraid you are going to write your own code using a CP 341 (if your CPU is a S7-300; a S7-400 will require a CP 441-2)with a Modbus Master driver. Here is a link to the manual for such an application. SIMATIC S7-300/S7-400 Loadable Driver for Point-to-Point CPs: MODBUS protocol, RTU format, S7 is master You will of course need the basic information on the Ascon Temperature controller as a Modbus slave, including the comm parameters it will accept and the Modbus mapping (Modbus addressing of the data exchange points in the slave's memory). This should be available somewhere on the Ascon website. How easy this will be depends on how familiar with Modbus parameters, function codes and addressing. If this is your first stab at this type of application, I suggest you read our friend smiffy's description of Modbus on the following thread: Modbus General Description There are multiple threads on this forum on Modbus programming for the CP 341, just do a search for them on the Search box that you will find on this page. It will also give you pointers on the way to implement the Modbus communication link. Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 4/26/2012 1:32 AM |
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