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Connection problem with S7-1200 and PC using OPC server

Created by: petervc at: 9/10/2014 4:02 PM (13 Replies)

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9/10/2014 4:02 PM	Rate (0)
petervc Posts: 6 Rating: (1)	Wat I want to do is communicate with the plc using OPC DA .NET Client with C# . Thus far I was able to (using a documented example from the siemens webiste) : - setup a network with te plc and my computer with fixed IP's (192.168.0.2 PLC and 192.168.0.1 for my pc). - can load a program into the plc with simple OB1 a DB1 that contains a boolean "MyBoolean". - can go online with TIA and even change the "MyBoolean" value in the PLC. - I configured an OPC server an was able to make it start (using the import function in the station conigurator). Here all seems ok, except next to the OPC Server in the column "Conn" a "disconnected" icon is shown. - Made as documented the example also a S7 connection. - Checked if everything seems ok in the Communications settings. - Turned of my firewall (just to be sure it was not this). But still no luck, I however can connect (using both c# and OPC scout) with the OPC com server. It seems not possible to read/write any values from/to the PLC. I get always "E_UNKNOWN_ITEM_NAME" in the OPC Scout. I check if the symbols file to be sure the "MyBoolean" is there. Like sugested into the OPC scout help I also added under "OPC.SimanticNet/S7/DB a DB1 where I would need to see the "MyBoolean", but nothing is displayed. I have no clue anymore in what could be wrong with it. I use TIA V13 (we got it and installed it just a few days ago). Can anyone help me futher with this ? The example I bassed myself on can be found here :http://support.automation.siemens.com/WW/view/en/21043779 Thanks.
petervc Posts: 6 Rating: (1)
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9/10/2014 4:06 PM	Rate (0)
0_Einstein Diamond Member Joined: 7/7/2010 Last visit: 3/10/2025 Posts: 15721 Rating: (2487)	petervc Wat I want to do is communicate with the plc using OPC DA .NET Client with C# . Thus far I was able to (using a documented example from the siemens webiste) : - setup a network with te plc and my computer with fixed IP's (192.168.0.2 PLC and 192.168.0.1 for my pc). - can load a program into the plc with simple OB1 a DB1 that contains a boolean "MyBoolean". - can go online with TIA and even change the "MyBoolean" value in the PLC. - I configured an OPC server an was able to make it start (using the import function in the station conigurator). Here all seems ok, except next to the OPC Server in the column "Conn" a "disconnected" icon is shown. - Made as documented the example also a S7 connection. - Checked if everything seems ok in the Communications settings. - Turned of my firewall (just to be sure it was not this). But still no luck, I however can connect (using both c# and OPC scout) with the OPC com server. It seems not possible to read/write any values from/to the PLC. I get always "E_UNKNOWN_ITEM_NAME" in the OPC Scout. I check if the symbols file to be sure the "MyBoolean" is there. Like sugested into the OPC scout help I also added under "OPC.SimanticNet/S7/DB a DB1 where I would need to see the "MyBoolean", but nothing is displayed. I have no clue anymore in what could be wrong with it. I use TIA V13 (we got it and installed it just a few days ago). Can anyone help me futher with this ? The example I bassed myself on can be found here :http://support.automation.siemens.com/WW/view/en/21043779 Thanks. It might be something as simple as Windows Control Panel -> Set PG/PC Interface and select theproper configuration. This may already be set correctly, but if you have not set it yet, then that may be the problem.
	science guy
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9/11/2014 8:52 AM	Rate (0)
petervc Posts: 6 Rating: (1)	Hello huggy_d1, Thanks for the advise but that was one of the things I also already checked. And now re-cheked it to be sure. It seems the correct adpater is selected and shown as "<active>", in the other taps all adapters a checked on. So i guess that is correct. Unless it is not ok in the "LLDP/DCP" and "PNIO Adapter" tab's to have them all checked on. I have 4 adapters, but only 2 active now, internet connection DHCP and one fixed IP for the PLC.
petervc Posts: 6 Rating: (1)
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9/11/2014 12:46 PM	Rate (0)
redshark Member Joined: 9/11/2014 Last visit: 10/17/2024 Posts: 3 Rating: (0)	Did you check DCOM settings in windows? [softnet opc v12 has special button in one aplication to enable all DCOM settings for communication]

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9/11/2014 12:59 PM	Rate (0)
petervc Posts: 6 Rating: (1)	I have alse seen that in many examples with S7-1200 they always show in TIA two S7-connections, one from the PLC to the OPC-Server and one back. In my case I can only create on connection (it does not automaticly create two when connected both in 'Devices & networks). The "Special connection properties" is also disabled ans sayas One-way for the S7-Connection. I wonder if this is normal, or should it also have a dual connection ? And if so, how can I make this possible or is this depending on the type of S7-1200 plc ? I have a "1212C AC/DC/RLY (6ES7 212-1BE40-0XB0)". Also see screenshot in attachment. Attachment 2014-09-11_125228.jpg (1047 Downloads)
petervc Posts: 6 Rating: (1)
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9/11/2014 1:17 PM	Rate (0)
petervc Posts: 6 Rating: (1)	redshark Did you check DCOM settings in windows? [softnet opc v12 has special button in one aplication to enable all DCOM settings for communication] I tried it, found the button in Security Controller ("repeat settings"), but still no luck. I have been reading in an other documentation that also I should be able to see the S7-Connection in OPC scout when I browse "OPC.SimanticNET". But I only see "@LOCALSERVER". But is does say the server is running and protocol is COM/DCOM in connection defaults.
petervc Posts: 6 Rating: (1)
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9/13/2014 6:38 PM	Rate (0)
Michael K Gold Member Joined: 9/3/2008 Last visit: 3/11/2025 Posts: 933 Rating: (164)	petervc From your description it sounds like the opc items may not have been enabled. It could be that you are missing a setting in the project. Try on the PC station to select the station itself. In the Properties, you will find in the "General" section that you have to enter the name of the computer where the OPC server (Simatic Net) is running. It has to be entered in the field "Name". You also have to put a checkmark in the option "Computer name is identical to PC station name". If you click on the "OPC Server" object in the PC Station, you will find the option "S7 -> OPC tags". Here you have to select "All". After you have done this, compile the PC station and download to the pc station. Now connect with OPC Scout and see if you can find the connection name under \SYM:
	Michael
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9/15/2014 9:21 AM	Rate (0)
petervc Posts: 6 Rating: (1)	Michael K petervc From your description it sounds like the opc items may not have been enabled. It could be that you are missing a setting in the project. Try on the PC station to select the station itself. In the Properties, you will find in the "General" section that you have to enter the name of the computer where the OPC server (Simatic Net) is running. It has to be entered in the field "Name". You also have to put a checkmark in the option "Computer name is identical to PC station name". If you click on the "OPC Server" object in the PC Station, you will find the option "S7 -> OPC tags". Here you have to select "All". After you have done this, compile the PC station and download to the pc station. Now connect with OPC Scout and see if you can find the connection name under \SYM: Michael K, What I can see in under \SYM is "S7-1200 station" (see attachment), but I could see this as before I checked ""Computer name is identical to PC station name" and done the donwload. The tag's settings was already ok and set to "All". But I still seem not to be able to connect or read any data from the S7-1200 with that. Like I have learned out of other example I should also be able to see the S7 connection under \S7 (in my case named "S7_connection_1"), is that correct ? now I only can see "@LOCALSERVER" Maybe a stupid question , but can it be that the OPC will not work because of wrongfully installed software of even licenses ? I think I have done evenything correct when installing everything,but it is also the first time I did install it. And is there a way to check this ? I can check the "Installed software" menu in the TIA portal, but there all seems ok for me. Attachment 2014-09-15_090230.jpg (968 Downloads)
petervc Posts: 6 Rating: (1)
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9/15/2014 6:43 PM	Rate (0)
Michael K Gold Member Joined: 9/3/2008 Last visit: 3/11/2025 Posts: 933 Rating: (164)	petervc, For connections to 1200 cpus, the opc server will automatically create a folder "S7-1200 station_1" (or whatever name you give your 1200 station)in the \SYM folder. Inside here you will find your 1200 CPU by name (default PLC_1). In the \S7: folder you will find the connections you see with the icons "OPC" in "Network view" in the list "Connections". The name will be the one listed in the column "Local ID (hex)". Make sure you compile the PCSTATION and then download hardware. Also set the PG/PC interface on the opc server station to "PC Internal".
	Michael
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11/24/2014 11:32 PM	Rate (0)
Nais Posts: 20 Rating: (1)	Michael K petervc From your description it sounds like the opc items may not have been enabled. It could be that you are missing a setting in the project. Try on the PC station to select the station itself. In the Properties, you will find in the "General" section that you have to enter the name of the computer where the OPC server (Simatic Net) is running. It has to be entered in the field "Name". You also have to put a checkmark in the option "Computer name is identical to PC station name". If you click on the "OPC Server" object in the PC Station, you will find the option "S7 -> OPC tags". Here you have to select "All". After you have done this, compile the PC station and download to the pc station. Now connect with OPC Scout and see if you can find the connection name under \SYM: Hi Michael! I´m having the same problem as Petervc. I´m using a S7-1217C CPU and I´m following step by step the instructions given in the Siemens document "Connecting a PC Station to an S7-1200 using OPC(12/2013)" plus your above comments, in order to build my first OPC project. As Petervc explained, only one S7 connection is visible in TIA Portal v.13 while in the referred document appears twice(OPC->PLC and PLC->OPC), and the S7 connection Property "Active connection establishment" located in the submenu "Special connections properties" is greyed out. Why is that??? I´ve been checking all what I could think of but nothing seems to unlock the Special connection properties. Is it perhaps due to the v.13? or am I forgetting something in my program? I´m stuck at this point so any help is welcome. Find attached my "OPC Communication" project. Looking forward to your answers. Attachment OPC Communication.zip (819 Downloads)
Nais Posts: 20 Rating: (1)
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