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DP on profibus

Created by: maxime54500 at: 1/25/2011 3:07 PM (9 Replies)

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1/25/2011 3:07 PM	Rate (0)
maxime54500 Posts: 9 Rating: (0)	Hello everybody, I try to establish a DP communication between 2 S7-300. My stations are configured according toHow do you configure a CP342-5 as DP slave to a CP 342-5 as DP master? Now, my problem is to check if i can transfer informations between master and slave. I take a screenshot of OB1 online in attachment. Someone can help me to know what does it means? What is the signification of VKE, STA and STANDARD? And how can i check that my program works well? Attachment S7-online.JPG (195 Downloads)
maxime54500 Posts: 9 Rating: (0)
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1/25/2011 3:49 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 3/20/2025 Posts: 12344 Rating: (2707)	Hello Maxime; You seem to be using the same exchange address area in FC1 and FC2 in your example. Try to use a seperate data area for each, either in the same DB but at a different DBB address, or in a different DB. Look at the example configuration of FC1 and FC2 in this FAQ: What should you watch out for when configuring a CP342-5 as DP master? Hope this helps, Daniel Chartier
	Last edited by: O_Moderator at: 1/26/2011 10:51 AM link edited
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1/25/2011 4:13 PM	Rate (0)
maxime54500 Posts: 9 Rating: (0)	Thanks for your answer. I miss to say that i use a S7-300 with a profibus module CP342-5. So i need to use the same adresses because the processor send and receive informations through the same profibus module.
maxime54500 Posts: 9 Rating: (0)
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1/25/2011 4:13 PM	Rate (0)
Chilly_Garfield Posts: 316 Rating: (37)	Hey maxime54500, I think there are problems while you call two errands in on cyclus to one CP! Call only one function call in one cyclus! Then it should works!
Chilly_Garfield Posts: 316 Rating: (37)
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1/25/2011 4:44 PM	Rate (0)
maxime54500 Posts: 9 Rating: (0)	thanks, but my problem is to check if my programs works fine. I want to know how to do to check that it works fine. Maxime
maxime54500 Posts: 9 Rating: (0)
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1/25/2011 6:30 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 3/20/2025 Posts: 12344 Rating: (2707)	maxime54500 thanks, but my problem is to check if my programs works fine. I want to know how to do to check that it works fine. Maxime Hello maxime; Do you have the hardware to test this? Or PLCSIM, for a simulation test? The only conclusive proof that your configuration workswould besending data from one PLC and recieving it in the other. I would suggest you go back to the pdf you pointed out in your original post, checking the suggested configuration without descrepancies compared you what you have programmed. Notice the data areas attached to FC1 and FC2 in the slave, and the configuration of FC1 and FC2 in the master; understand why the Siemens programmers are using DB1 and DB2 for the send and recieve areas. Then connect the 2 CPs, master and slave; prepare VAT tables in the master and the slave, place known values in the different bytes of the Send area of the master, and see if you recieve them in the Recieve area of the slave. Do the same with the slave's Send area. Hope this helps, Daniel Chartier

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1/26/2011 11:29 AM	Rate (0)
maxime54500 Posts: 9 Rating: (0)	Thanks for your answer. Yes, i have the hardware to test this. As you said, I use the VAT table with different values and I read again the pdf. I initialize values with the VAT but the communication doesn't work. On the slave, I see that the "send_data" are ok but not the "receive_data" (see attachment, the send_data on the master are initialized at 9). The fields done and status of FC1(DP send) on the master and FC2(DP recv) on the slave oscillate between the couple 1 / 16#0 and 0 / 16#8180. This behavior is normal? Attachment S7-online.JPG (179 Downloads)
maxime54500 Posts: 9 Rating: (0)
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1/26/2011 3:14 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 3/20/2025 Posts: 12344 Rating: (2707)	Hello maxime; The appearance of any error code in a communication FC is a sign that something is not right, either in the parametrization or in the programming of the function. I have prepared an attachment showing the error codes of the DP_SEND function. The original document can be found here: http://support.automation.siemens.com/WW/view/en/30564821 So, it would seem that the CP is compalining of the parameters you have assigned it. Please examine them and valifdate that the CP_LADDR is correctly selected and written as a hexadecimal value ( w#16#160 correspoonds to decimal 352, is that the correst start address of the CP?) and that the ANY pointer for your SEND parameter is OK. hope this helps, Daniel Chartier Attachment DP_Send ErrCodes.JPG (196 Downloads)

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1/31/2011 10:21 AM	Rate (0)
maxime54500 Posts: 9 Rating: (0)	Thank you for your answer Daniel Chartier. The CPLADDR is the good one. How can i check that the ANY pointer for the SEND parameter is OK? My parameter is P#DB1.DBX10.0 BYTE 5 Maxime Attachment adress_slave.JPG (167 Downloads)
maxime54500 Posts: 9 Rating: (0)
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1/31/2011 4:51 PM	Rate (0)
maxime54500 Posts: 9 Rating: (0)	Thank you to every one, i solved my problem. I can transfer data between the slave and the master. But I don't understand how works the adresses. Actually, on the material configuration of the master, i define the input adress, the lengh as . When i change the lengh of this area a problem occurs. The led busf flashes, what does it means? Do you know a paper which explain how works the adresses in this case?
maxime54500 Posts: 9 Rating: (0)
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