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Get data from other S7 PLC

Created by: Kurt_Enzlin at: 11/22/2009 2:25 AM (19 Replies)

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11/22/2009 2:25 AM	Rate (0)
Kurt_Enzlin Posts: 21 Rating: (0)	Hi there, I have the following problem: I am using a S7 400 PLC and now i need to get data from another S7 300 PLC. Both PLC's are connected using ethernet. Normally i would use AG_SEND /AG RECEIVE for this kind of communication, but the plc is from another part of the installation and allso from another supplyer so I can't and don't want to change the program of it. Is there any other way to get data from a DB from the other PLC without changing the program of it? Thanks in advance! kind regards, Kurt
Kurt_Enzlin Posts: 21 Rating: (0)
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11/22/2009 9:57 AM	Rate (2)
Ayman Elotaify Platinum Member Joined: 5/28/2008 Last visit: 11/6/2024 Posts: 4516 Rating: (839)	Dear Kurt_Enzlin, You can get the data you want without changing the software of the CPU using GDC "Global Data Communication" GDC can work only with MPI connection and you have to open the net pro and to fill in the table to identify which data should be send from which CPU to the other CPU. In any case, here's attached some screen shots that descripe how could you make it. It's very easy way. Regards, Attachment GD.zip (974 Downloads)
	Ayman Elotaify
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11/22/2009 10:52 AM	Rate (1)
IBN-Service Posts: 8946 Rating: (999)	Kurt_Enzlin Hi there, I have the following problem: I am using a S7 400 PLC and now i need to get data from another S7 300 PLC. Both PLC's are connected using ethernet. Normally i would use AG_SEND /AG RECEIVE for this kind of communication, but the plc is from another part of the installation and allso from another supplyer so I can't and don't want to change the program of it. Is there any other way to get data from a DB from the other PLC without changing the program of it? Thanks in advance! kind regards, Kurt Hello Kurt, the better way is to use SFC67 X_GET. With SFC67you have to do not any change in the other PLCprogram. Take care that the MPI - Adress of your CPU is different form the other CPU. Elotaify's idea is not so fine, because you have to load the GDC table into the other CPU also!
IBN-Service Posts: 8946 Rating: (999)
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11/22/2009 1:17 PM	Rate (5)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 11/14/2024 Posts: 3027 Rating: (1057)	Hello Kurt_Enzlin I agree in principle with IBN-Service, but suggest you take at look at system functions SFB14 (GET) and SFB15 (PUT) since you said you have an Ethernet connection between your 400 and the 300. Note that you will have to configure an S7 connection for your S7-400. It will in this case be a so called "unilaterally" configured one (i.e. the 300 won't need to know about it nor be configured/changed for this,you simply select the partner as "unspecified" and all you need to know is obviously the 300's IP address). The 300 will now act as a Serverand its S7 operating system will "serve" your 400's "GET" or "PUT" request without you having to touch the 300. You can find some examples (for 400s as well as300s for completeness) which should help you along the way below: Sample program: S7 communication with the blocks SFB14 ("GET") and SFB15 ("PUT") with S7-400 How do you program communication blocks FB14 "GET" and FB15 "PUT" for data communication on the S7-300? I hope this helps
	Last edited by: fritz at: 11/22/2009 1:37 PM Fixed up 300''s description as a Server Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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11/22/2009 2:02 PM	Rate (0)
Kurt_Enzlin Posts: 21 Rating: (0)	Thank you all for the fast response. I prefere the solution of fritz because the two PLC's are in differend locations in the factory, so using the existing ethernet is the easiest. I'll try it tomorrow morning. All of you thanks a lot for your effort! Kind regards, Kurt
Kurt_Enzlin Posts: 21 Rating: (0)
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11/22/2009 2:15 PM	Rate (0)
IBN-Service Posts: 8946 Rating: (999)	fritz ... I agree in principle with IBN-Service, but suggest you take at look at system functions SFB14 (GET) and SFB15 (PUT) since you said you have an Ethernet connection between your 400 and the 300. ... Hi Fritz, you are right 100% agree.
IBN-Service Posts: 8946 Rating: (999)
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11/25/2009 4:08 AM	Rate (0)
Kurt_Enzlin Posts: 21 Rating: (0)	Hi, Some more problems. I have tried the use of SFB14 and SFB15 but it doesn't want to work. It keeps saying that the connection "is being set up" and as details it gives "reason for cancellation unknown" in NetPro and i am not able to get data from his PLC. I've allso talked to the programmer of that system (is't quite difficult because he only speaks chineese and i don't) and we tried to use tcp IP. But when we do so his PLC goes into stop and requests OB 122. I get this fault inside the FC of AG_SEND. Before you ask, i've used the AF_SEND block for the CP300 in his program and the one for the CP400 in my program. But in Netpro the condition of the connection is OK when we insert the OB122. Only it keeps saying that there is someting wrong with AG_SEND. The communication card he uses is an CP 343-1 6GK7 343-1EX30-0XEX and it is mounted on rack 1, not in the rack from the CPU. And there is a password on both CPU's Do you have any idea what i am doing wrong? I've just followed the instructions from the link you gave me on the siemens site. Thanks in advance. Kind regards, Kurt
Kurt_Enzlin Posts: 21 Rating: (0)
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11/25/2009 9:02 AM	Rate (1)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 11/14/2024 Posts: 3027 Rating: (1057)	Hello again Kurt I don't have a "smoking gun" solution but suggest you start with the following basic test: Unplug you S7-400 from the Ethernet,connect your Laptop to it instead, give your Laptop the IP address and subnet mask that you had configured for your S7-400 has andsee if a "ping" of the 300 works. If the pingdoes NOT work, you either have a problem with your physicial Ethernet connection OR a configuration problem on the 300 side (e.g. CP343 not properly configured in HWconfig, HWconfig wasn't downloaded,IP address and/or subnet mask wrong etc.). Shouldthe ping work ok, the implementation of theGET/PUT should be as simple as in the example. Having said that, it just dawned on me that the example links that I gave you will probably have the two S7 PLC's integrated into one project, whereas your will only have your S7-400 in your project. The "minor detail" that now comes into play is that you will not only have to enter the S7-300's IP address into your NetPro'sS7 connection configuration BUT also fill in the "address details" tab (apologies for neglecting to mention this in my earlier post). Anyway, attached is an example screendump which should help you with this (Note that the partners"Slot" must be "2" as this refers to the CPU's Slot and NOT to the CP343'sSlot) Please check your NetPro config again and adjust if need be, compile and download it into your 400 and your link will hopefullybe established (and you can then "worry" about theGET/PUT calls) P.S: It is ok to have the CP343 in Rack 1 in the S7-300, as long as an IM360/IM361 combination is used to link the 300's CPU rack with the expansion rack (I presume this is the case as this is chekced in HWconfig) I hope this helps and good luck Attachment Unspecified S7 connection in NetPro (400 to 300 example).jpg (1278 Downloads)
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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11/27/2009 9:25 AM	Rate (0)
Kurt_Enzlin Posts: 21 Rating: (0)	Hello fritz, Thanks for your fast answer. Ping to the s7 400 PLC works, allso sending data to another PLC works. I have two S7 400 PLC's in the system and they are communicating to eachother without any problem using TCP IP. The S7 300 plc rack is indeed connected with an IM 360-361 module, so this should be no problem. I have allso tried to make the hardware configuration from the S7 300 plc into my project and set up the connection to the PLC with NetPro, but it didn't work. But now i am no longer at the site in China. But if you have any more idea's, they are always welcome then I can test them nex time when I go back. Thanks and kind regard, Kurt
Kurt_Enzlin Posts: 21 Rating: (0)
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11/27/2009 5:05 PM	Rate (1)
J_Bell Posts: 5822 Rating: (412)	Dear Kurt, I am sorry for the late entry here but... anyway. I understand that you want to use S7-Connections with PUT / GET on Ethernet, am I right so far? If so, why do you use SEND / RECEIVE blocks? I am sorry... but I got lost here somehow. If you configure a S7-Connection on your PLC you usually have two ways to do so, the Server - Client and Client - Client connection. The Server -Client connection would be the preferable in your case. Here you use only the Connection configuration on the Client, your S7-300 and the remote station is not touched at all. So inf you configure your Connection as a single sided configured connection you get a local TSAP and a remote TSAP... the remote TSAP is the important one. How does your remote TSAP look like? It must start with 03 (this tells the PLC that you have an unconfigured connection) and than goes on with the location of the CPU. In an S7-300 this is always slot 2 in an S7-400 this may be another slot but this may be found on site or in STEP7. So if you have a S7-300 the remote TSAP must be 03.02 is this the case with your S7-Connection? If yes the connection should work... if the remote PLC is not too stuffed with other S7-Communication. I hope I could help a bit. Best regards J_Bell
J_Bell Posts: 5822 Rating: (412)
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