AdvancedHMI Software
General Category => Open Discussion => Topic started by: tatin on November 08, 2020, 03:45:27 PM
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Hello, in case someone is interested, I leave a slightly more tested version of a communication driver for Siemens PLCs that uses Snap7.
To integrate it, you have to copy the files in the "AdvancedHMIDrivers" folder, within the project add the SiemensCom.vb file as an existing element, add the Snap7.net.dll file in "References" and finally copy the "snap7.dll" file. in the build folder of the project "AdvancedHMI \ bin \ Debug"
By the way, it works with the Tia Portal simulator via NetToPLCSim.
Cheers...
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Nice contribution! I suspect a lot of people will be looking forward to trying this out.
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Great! I will try it as soon as I have another project with Siemens, which will be within the next three weeks.
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Hi all and thanks to Tatin for the integration and thanks to Archie for great AdvancedHmi Project.
I tried to install and use snap7 following all indications written in this thread, but it didn't work for me. I have windows 8 64bit and visual studio 2015.
I suggest to all to make these amending on file SiemensCom.vb:
1) change the return datatype of Write function to string instead of integer as below:
Public Function Write(startAddress As String, dataToWrite As String) As String Implements MfgControl.AdvancedHMI.Drivers.IComComponent.Write
Dim temp(0) As String
temp(0) = dataToWrite
Write(startAddress, 1, temp)
Return ("1")
'Return Write(startAddress, 1, temp)
End Function2) Chenge the return line
Pay attention Return("1") is a compromise because the function
MfgControl.AdvancedHMI.Drivers.IComComponent.Write returns back a string.
For easy use, in the attached file the amended SiemensCom.vb
Now I can use snap7. Easy to read and write DB, Merker, Coils etc... for example if you want set to 1 the Merker M18.2 using a BasicButton, you need just to select SetTrue the OutputType and fill M18.2 in the field PLCAddressClick.
Moreover I want underline the powerful of snap7 if compared with modbus. For example, writing a single bit inside a word with modbus, we need to read word, change it and send it back with the risk of data corruption. Snap7 has native fuction for single bit set/reset.
Best Regards e ciao Luciano
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Hi all, one additional thing concerning the returned value on funcion
Public Function Write(startAddress As String, dataToWrite As String) As String Implements MfgControl.AdvancedHMI.Drivers.IComComponent.Write
Dim temp(0) As String
temp(0) = dataToWrite
Write(startAddress, 1, temp)
Return ("1")
'Return Write(startAddress, 1, temp)
End Function
Instead of Return("1") as string, we can jus modify the original Return Write(startAddress, 1, temp) converting the result in a string like this
Public Function Write(startAddress As String, dataToWrite As String) As String Implements MfgControl.AdvancedHMI.Drivers.IComComponent.Write
Dim temp(0) As String
temp(0) = dataToWrite
Write(startAddress, 1, temp)
'Return ("1")
Return Write(startAddress, 1, temp).ToString()
End Function
ciao
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Hi Lucky, I'm glad the driver works for you but in V3.99y the Write function returns an Integer to see if the writing has been done. Also, in the code of the BasicButton component, the value returned by the Write function is never used.
MfgControl.AdvancedHMI.Drivers.IComComponent.Write(startAddress As String, dataToWrite As String) As Integer
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Hi LUCKY,
I'd like to know which PLC's will get connected with this driver?
S7-1200
S7-1500
Siemens micro
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Hi aquilmustafa.
I am using s7-1200
It works very well for my use.
Ciao Luciano.
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I have followed the instructions, but I am getting the error:
System.DllNotFoundException
HResult=0x80131524
Message=Unable to load DLL 'snap7.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)
Source=Snap7.net
StackTrace:
at Snap7.S7Client.Cli_Create()
at Snap7.S7Client..ctor()
at AdvancedHMIDrivers.SiemensCom.CreateDLLInstance() in C:\Users\christopher.curry\Downloads\AdvancedHMIv399xR1\AdvancedHMIDrivers\SiemensCom.vb:line 110
at AdvancedHMIDrivers.SiemensCom.PollUpdateTimer_Tick(Object sender, EventArgs e) in C:\Users\christopher.curry\Downloads\AdvancedHMIv399xR1\AdvancedHMIDrivers\SiemensCom.vb:line 638
at System.Timers.Timer.MyTimerCallback(Object state)
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Instead of adding snap7.dll file to Support/Siemens folder, remove it and then add it directly to the project where your SiemensCom.vb driver is and set it to Copy Always.
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Thank you Godra for the reply.
I am pretty new to .net....
When adding the snap7.dll file to the project, do I do it at the top of the Solution Explorer where it shows My Project with the wrench symbol.
Also, do I add it as a reference or existing item.
And how do I set snap7.dll file to copy always?
Thank you
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Hi Godra,
I have it working now.... disregard previous reply
and thanks again for the help!
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Actually, I never did figure out how to set snap7.dll copy always.....
If someone could let me know where to set to copy always that would be great...
thank you
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See the attached picture.
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Hi All,
My S7-1200 PLC Project has MW and MD variables instead of DB1.DB0 format. How can i use it?
Please guide me as to how I can accommodate this into existing project.
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Hi, try changing DB1.DB to M: M0.0, MB0.0, MB0, MW0, MD0, ... same with I(input), Q(output)
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Hi again, i have a more updated version.
https://drive.google.com/file/d/1xPVYMU-rqc6VH0835sxEOcw59L1iLS0t/view?usp=sharing
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Thanks a lot Tatin. I'll go through it and comeback to you.
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Thank you Godfra and Tatin for the help with this driver..... it is greatly appreciated.
I have been using the ControlLogix driver, and I have been creating the code:
Dim BottomMotorSpeed As Integer = EthernetIPforCLXCom1.Read("BottomMotorSpeed")
Is there a comparable function in the Siemens driver to the EthernetIPforCLXCom1.Read?
Or do I have to do something like the following:
Dim recipesteps As Integer
If e.PlcAddress = "MW10" Then
recipesteps = e.Values(0)
End If
Thank you again for the help....
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Hi, this functionality is not implemented in the driver, as it is based on Snap7, only the memory addresses can be accessed.
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Hello Tatin,
can you please write a simple code (for a beginner) how can i read a value from PLC using the driver.
The example of siemens variables :
(DBxxxx,DDxxxx)
(DBxxx,Dxx.x)
(Exxxx.x)
(PEWxxxx)
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Hello, it is not necessary to write code to read a value from the PLC, you just have to open the example project, add the SiemensCom driver as explained by a colleague previously, insert a BasicLabel on the screen and finally put in the property PLCAddressValue for example DB1.DBW0. Well, don't forget to put the SiemensCom driver in the ComComponent property. As well as assigning the IP address to the driver.
In the source code of the driver are all the possible examples for DBs, but also if you change DB1.DB to M, I, Q you can access these memory areas.
Bear in mind that this driver forces you to define access to a DB as not optimized or something like that in the TIA Portal project.
I hope I have helped you with your question ...
Greetings...
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I know this thread is almost a year old but had there been any more development on this driver? Has it been tested with S7-300? As our company has been growing over the years all our new equipment has been coming in from Germany and its all Siemens..
Thanks
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I'm sorry but I have not used the driver again, it should work with the S7-300 but keep in mind that I have not tested it much, test it well because it may have errors because I am not an expert programmer.
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I know this thread is almost a year old but had there been any more development on this driver? Has it been tested with S7-300? As our company has been growing over the years all our new equipment has been coming in from Germany and its all Siemens..
Thanks
I've been using the Modbus driver succesfully but with S7-1200 and S7-1500 and works pretty well, with almost all the functionallity of all the other drivers. I do not know if S7-300 supports it. You only have to write code in VB to convert values that are not integers, like strings. I can share some code I used if want.