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Non configured acyclic Profibus PA communication

Created by: jboti at: 2/26/2008 8:20 AM (3 Replies)

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2/26/2008 8:20 AM	Rate (0)
jboti Experienced Member Joined: 6/8/2007 Last visit: 9/9/2024 Posts: 53 Rating: (3)	Hi, I need to implement an acyclic communication with several Profibus PA slaves through DP-PA Coupler. Master will probably be a CPU313C-2DP. Using HW-Config to configure the master and one slave I have managed to achieve communication using SFB52/SFB53 software interface. Now my question is: is it somehow possible to achieve communication without configuring it with HW-Config? (Cyclically querying the addresses) Or is there another way of doing this? Thanks in advance Boti

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2/26/2008 9:49 AM	Rate (0)
J_Bell Posts: 5822 Rating: (412)	Dear jboti, I am sorry but I believe this will not work. The thing is that you need to have a logical Address to communicate to if you have a PLC. Would you have a PC I think you could do something being a Master Class 2, but a PLC is not capable of being a Master Class 2. Maybe someone else has a better idea. Best regards J_Bell
J_Bell Posts: 5822 Rating: (412)
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2/26/2008 10:24 AM	Rate (0)
jboti Experienced Member Joined: 6/8/2007 Last visit: 9/9/2024 Posts: 53 Rating: (3)	Hi Thanks J_Bell for the answer. We are trying to make a controller (using a PLC) which is capable of reading several Profibus PA transmitters and controlling some digital outputs according to the measured values using some simple function (alarm high, alarm low, window, etc). It would be great if one could add a new slave to the bus (even with manual manual slave address configuration) without the need for a PLC program (or harware configuration) modification. Using a HMI device the operator could set up the new slave to drive a certain digital output according to a simple function. The important thing is not to need a PLC programmer for the job. Any ideas how is this possible? Thanks in advance Boti

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2/26/2008 10:44 AM	Rate (0)
J_Bell Posts: 5822 Rating: (412)	Dear Boti, I am afraid not... at least not without the use of some function within the PLC Program. There are some functions called CiR, maybe this could help you a bit further. See this Manual: Modifying the System during Operation via CiR If you program around these function it might be possible. But you would still need STEP 7 anyway. Best regards J_Bell
J_Bell Posts: 5822 Rating: (412)	Last edited by: J_Bell at: 26.02.2008 10:48
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