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S7-1200 as PROFIBUS DP I-slave

Created by: Eng.ahmedSubhi at: 12/14/2014 7:28 AM (10 Replies)

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12/14/2014 7:28 AM	Rate (0)
Eng.ahmedSubhi Posts: 27 Rating: (0)	Hi guys..... I have a S7-1200 system with CM 1242-5 PROFIBUS DP Slave and S7-300 CPU 315-2DP as master...my question is how to access the data in the S7-1200 slave(digital,analog,M memory)? Thanks...
Eng.ahmedSubhi Posts: 27 Rating: (0)
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12/14/2014 8:48 AM	Rate (0)
William_B Posts: 5225 Rating: (1203)	Hi there. Please see if the attached image helps you. Greetings. w Attachment Visual clue_Link S7-1200 as DP slave.jpg (2235 Downloads)
William_B Posts: 5225 Rating: (1203)
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12/14/2014 9:18 AM	Rate (0)
Eng.ahmedSubhi Posts: 27 Rating: (0)	I am sorry William B. but i could not downloded the image
Eng.ahmedSubhi Posts: 27 Rating: (0)
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12/14/2014 9:35 AM	Rate (0)
William_B Posts: 5225 Rating: (1203)	Eng.ahm I am sorry William B. but i could not downloded the image ouch.. There is nothing wrong with the attachment - I checked now to confirm. The best would be the full resolution image. Okay.. the attached file now is reduced quality and size inside a ZIP file. w Attachment CX1.zip (766 Downloads)
William_B Posts: 5225 Rating: (1203)
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12/14/2014 8:01 PM	Rate (0)
Eng.ahmedSubhi Posts: 27 Rating: (0)	Thank u William B. your attachment was very helpfull.. I understand from the attachment that the program in the S7-1200 CPU must copy the data that the master needed from and to this virtual address..is this right?
Eng.ahmedSubhi Posts: 27 Rating: (0)
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12/14/2014 8:17 PM	Rate (0)
William_B Posts: 5225 Rating: (1203)	Hi. The addresses you see is shown for MASTER and SLAVE. This example shows the configuration is done at SLAVE side. If the network has been configured then you should be able to see the MASTER now also have this configuration. If not you will have to repeat the configuration at the MASTER. You could have done the virtual I/O setup in the MASTER instead. The same would apply as said before. Please check both sides to make sure the software is doing it.. if not you need to check the network setup and perhaps manually configure both sides. Greetings. w
William_B Posts: 5225 Rating: (1203)
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12/14/2014 9:31 PM	Rate (0)
Eng.ahmedSubhi Posts: 27 Rating: (0)	Thank u again William B. your explanation is very helpfull I meant in my question that for example if I have an analog input channel i must first read the channel then copy its value to the virtual address area so that the master can reach it?
Eng.ahmedSubhi Posts: 27 Rating: (0)
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12/15/2014 4:59 AM	Rate (0)
William_B Posts: 5225 Rating: (1203)	Eng.ahm Thank u again William B. your explanation is very helpfull I meant in my question that for example if I have an analog input channel i must first read the channel then copy its value to the virtual address area so that the master can reach it? There is nothing stopping you to link to/from physical I/O. You can make a transit area where the physical analog input (SLAVE) links directly to virtual output word (MASTER). Just be careful how the consistency works. w
William_B Posts: 5225 Rating: (1203)
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12/15/2014 7:40 AM	Rate (0)
Eng.ahmedSubhi Posts: 27 Rating: (0)	Thank u again William B. This transit area can i make it programmatically or in the configuration?.. In other words do i need any portion of code in S7-1200 to link the physical addresses to the virtual ones? Thanks..
Eng.ahmedSubhi Posts: 27 Rating: (0)
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12/15/2014 9:00 AM	Rate (1)
William_B Posts: 5225 Rating: (1203)	Eng.ahm Thank u again William B. This transit area can i make it programmatically or in the configuration?.. In other words do i need any portion of code in S7-1200 to link the physical addresses to the virtual ones? Thanks.. As far as I know, the transit area can only be configured. The is no need to do coding to ensure the exchange in this case. @Experts: Please be so kind as to help this gentleman further - thank you. w
William_B Posts: 5225 Rating: (1203)
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This contribution was helpful to 1 thankful Users Eng.ahmedSubhi

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