Activity for Rossmann Engineering
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Rossmann Engineering posted a comment on discussion General Discussion
Please get the library from Github, which is the latest version.
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please share some code and make sure that your device is reachable and responding properly.
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The correct way would be to change the Property "UnitIdentifier" before every request, according to the slave you want to read/write data.
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There is a static Method in the ModbusClient class; public static string ConvertRegistersToString(int[] registers, int offset, int stringLength) public static int[] ConvertStringToRegisters(string stringToConvert)
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Usually there is no difference reading Holding Registers or Input Registers, Perhaps the Register address is not 30001? Sometimes the "3" Prefix indecates that it refers to the "Input Register" Block. It might be address "1"?
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Usually there is no difference reading Holding Registers or Input Registers, Perhaps the Register address is not 30001? Sometimes the "3" Prefix indecates that it refers to the "Input Register" Block.
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Hi, could you explain what you are trying to do? Stefan
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Hi, there is an example were I connected to an ethernet ip device which also handles a disconnection. Did you observed that example?
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Hi, thats the same with the digital outputs. In the Example on the website I am using the "setInstance" Method which initializes an Array (in this case with the length "1") If you would have to set the Output no. 9 you would have to use an Array with the length "2"
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Hi, thats a very hardware related question which is impossible for me to answer without access to the Hardeare and some documentation.
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I understand, the license is meanwhile updated ti MIT, but on the other hand for commercial applations doesn't it makes sense to pay a small amount for a commercial product (Since you also wan't to get pad for your work)?
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Just choose "quantity" 1. Then it returns an Array with the "length" 1
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Not trick, just click on the coil you want to change
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Unfortunatelly I don't have any VB.NET examples
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Hi, I din't try that, but if you write a register to the Server listening on port 3001 it should update the Registers of that Server instance and call the appropriate callback function, the same with the Server instance listening on port 3002
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That is NOT a Modbus Issue, thats simple C# programming and you'll find some anwers already in this duscussion (or ask google). A Modbus Register contains 16 Bit and is handles is signed value -32768 - 32768. If you need values between 0 - 65535, you have to convert.
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I think the answer is pretty obvious, your Modbus Device is not anwering the request. (I think yo u did not forget to connect first?)
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Hi I don't fully understand your code. But you definitelly have to check the mapping of your device, that has to match with your Modbus reading. It sounds to me that your trying to read a Holding Register to determine the state of a digital input, or did I missunderstand something?
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Confirmed, I am actually familar with ELAU controllers, and the EasyModbusTCP library can definitely communicate with an ELAU controller.
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I think this is an addressing issue with the Murr Modules. Unfortunatelly I don't have that Hardware to properly test it. If you already solved it you are welcome to share your solution, otherwise we can remote connect to your device to test?
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Der Post ist etwas älter, aber ja die Bibliothek kann kommerziell benutzt werden.
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Hi Tom, the size of the Array "registerValues" is "1"? I think you connect before to the Device? If both yes, then there is no reason why it shouldn't wok.
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Double - Please check a few Posts below
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Hi, I am not 100% sure if I fully understand. FC16 is a write command from the Client to the Server. To read Register use FC03 (Read Holding Registers).
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int signed =-18536; int unsigned = 0; unchecked { unsigned = (UInt16)(Int16)signed; }
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Hi Alessandro, yes I am meanwhile aware of that issue. Since I don't use VB, I never had that issue. Yes, I would appreciate if you would submit a commit for this.
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I am not sure if your Omron PLC proviedes Modbus Slave funktionalities, but you are using the constructor for Modbus-TCP if you try to connect via serial Port that can only be Modbus-RTU. Your USB to serial converter should add a COM-Port. If you are using Modbus-RTU you should use EasyModbus.ModbusClient modbusClient = new EasyModbus.ModbusClient("Com4");
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There is no example using an 1756-EN2T, but that should be supported by the library. Unfortunately the Rockwell documentation regarding the connection parameter is very bad :-(
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That should be solved now. You can use ForwardClose and UnregisterSession even if the Remote Device was down without properly disconnect.
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It still has not been implemented for the Client Class (Only for he Server Class) If you get a wrong result after a while I think your application contains some Requests comming from different Threads or Tasks with a missing synchronization.
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A two seconds delay can't come from the library. Maybe you could check your Network infrastructure or the PLC response Time. Usueally it takes few ms to get a response. But in fact a Modbus-TCP connection can never be Realtime.
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Hi, I don't think there is a Bug, because for connection sizes > 255 you have to use "large forward open". Large forward open is already implemented in the Code available at Github.
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Hi, please have a look at the Website, then go to "Media". There is an Example exactly for the Rockwell Point I/O.
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Couild you send me your configuration and some information which information you are trying to read or write?
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Hi, I updated the License. It is GPL.
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Possibly the static Method static Int32 ConvertRegistersToInt(int[] registers) could be helpful. Example: EasyModbus.ModbusClient.ConvertRegistersToInt(modbusClient.ReadHoldingRegisters(19,2))
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Hi, for the first bit: bool Bit0 = ((register & 0x1) != 0); second: bool Bit1 = ((register & 0x2) != 0); third: bool Bit2 = ((register & 0x4) != 0); ...
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Hi, it is not possible to write values above 65535 to a Register. A Register has 16 bit. If you want to transfer values above 65535 you'll need two registers.
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I don't think that this would be available. Propably for IOT Core very soon.
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Hi, unfortunately the "Connected" Property isn't 100% reliable. If the Server closes the connection, the "Connected" Property is still "TRUE". If you are trying to send a requets, in that case you would get an Timeout Exception. Propably the "Available" Method could be helpful. That Method checks only if the Server can be pinged via Network, but not if the connection is still alive.
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Which Issue do you have? Maybe the static Methods static float ConvertRegistersToFloat(int[] registers) public static int[] ConvertFloatToTwoRegisters(float floatValue) might be helpful?
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You are trying to connect to a server listening to Port 4001. As that really intended? Usually a Modbus Server opens port 502.
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Hi Paolo, I would do it in exactly the same way. Maybe if you have an aplication, were you read lots of registers and every millisecond counts, it would be more eficient to read the Registers: modbusClient.ReadInputRegisters(225, 8) with ine requets, but at the other hand your code is cleaner. Stefan
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Hi, I understand what you are trying to do, but unfortunately thats not possible to have two servers listening at the same port.
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Hi Satih, it is using RXTX.
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Yes, you are right, I created the examples some time ago, and I didn't update the DLL attached. The best way would be to use the DLL from the Sourceforge folder.
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Hi, the device ID can be changed using the property "UnitIdentifier"
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Hi, yes sorry for the confusion, I am about to change the license to GPL. But I didn't update that on sourceforge so far. The Sourceforge Site is always I bin behind the Github site.
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Hi, I tried the Method and it worked. Use the Method "ReadDiscreteInputs" to read the discrete inputs. You are trying to read coils. Regards Stefan
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Hi, there is some kind of cnnectivity ussue. Is the exception thrown at the "connect" Method? Stefan
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Hi Rudenko, please try : https://sourceforge.net/projects/easymodbustcp/files/V4.4%20Alpha/
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Hi, I will run some tests the next days and take care. I was working a lot on the ModbusRTU part and it could be that I missed an issue.
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Hi Ganesh, you should see were the Exception is thrown, and I think it is thrown in line registersToSend[i] = int.Parse(spParamvalues.Children[i].ToString()); So I think it is definitely an parser Exception. I don't kno what is spParamvalues.Children[i]? If these are textboxes is it possible that you have to write registersToSend[i] = int.Parse(spParamvalues.Children[i].Text); ?? Try to set a breakpoint and findout what string you are trying to parse. Stefan
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Hi Ganesh, it seems to be a problem while parsing the String. Please make sure that spParamvalues.Children[i].ToString() are only numbers. Stefan
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Forgot to mention, you could update the Port and IPAddress by using the Properties in the same way you already did. if (!modbusClient.Connected) { modbusClient.IPAddress = txtIpAddressInput.Text; modbusClient.Port = int.Parse(txtPortInput.Text); modbusClient.Connect(); label1.Text = "Connected"; }
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Okay, I think I see. Please Modify: using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace WindowsFormsApp1 { public partial class Form1 : Form { private EasyModbus.ModbusClient modbusClient; public Form1() { InitializeComponent(); modbusClient = new EasyModbus.ModbusClient(txtIpAddressInput.Text, txtPortInput.Text); } private void...
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Hi, you could follow the link "Code" (External link -> Code). You will then be redirected to the Github Page containing the code
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Hi, you are definitely sending only a "High" signal with that codeand never a "Low" signal to that Device. Could you maybe try what happens if you don't disconnect? Maybe the device turns all outputs to "low" if connection has been closed? Stefan
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Hi, the settings for P-Address and Port of the Modbus Server is correct, and the settings of your Network-Adapter is correct? Yout Firewall allows connection? Did you try to connect using my Modbus-Client example?
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No it can't so far since its not specified. But its only a small change, I will upload a modified version next week, so you could try.
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You'll find documentation at the website "easymodbustcp.net" Have you provided the correct SlaveID (Property 'UnitIdentifier')? I am not really sure if your devices are able to communicate with each other, because your TCP-serial converter is a very cheap device, which only translates the protocol from TCP to serial. But the Protocol for Modbus RTU and Modbua TCP is different. These are NOT compatible. So you need a Modbus TCP/Modbus RTU Gateway. (for example: Advantech ADAM-4572). This translates...
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Hi, its not possible at the moment, but its a good point! Will add that soon.
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Hi, at the moment you have to define the Serial Port in using the correct constructor. ModbusClient modbusClient = new ModbusClient ("COM1"); But you are right that we could initialize the COM Port also as soon as the Property SerialPort changes. I will fix that in the new version. Right now you have to use the correct constructor to initialize the Serial port.
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great to hear that you could make it work. I am not really familiar with Powershell. Maybe it is an issue with the .NET Framework it is using.
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Hi, I am not sure if I understood. You would like to send a Moddbus TCP Packet over a COM-Port? Is that what are asking for? Modbus RTU is specified for a data exchange using serial connection. Couldn't you use Modbus RTU? Stefan
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Hi, the bracket after "1.50" is not correct. Try: modbusClient.WriteMultipleRegisters(1010, ModbusClient.ConvertFloatToTwoRegisters((float) 1.50, EasyModbus.ModbusClient.RegisterOrder.HighLow));
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Hi, the bracket before "1.50" is not correct. Try: modbusClient.WriteMultipleRegisters(1010, ModbusClient.ConvertFloatToTwoRegisters((float) 1.50, EasyModbus.ModbusClient.RegisterOrder.HighLow));
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Hi, could the bracket before "1.50" is not correct. Try: modbusClient.WriteMultipleRegisters(1010, ModbusClient.ConvertFloatToTwoRegisters((float) 1.50, EasyModbus.ModbusClient.RegisterOrder.HighLow));
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Hi, what you could do is start the "EasyModbusJavaClient.jar" and see what information the Slave (Cient) sends to the Master (Server). Are you using the latest Version V2.8? Did you set the correct UnitIdentifier? Could you provide some code?
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Methods ModbusClient
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Hi, could you provide some more infomations (Source code, which device do you want to connect)? Thanks
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Yes the UnitIdentifer is not needed for ModbusTCP, only for Modbus RTU. It is specified to set the unitidetifier for ModbusTCP to "0" of "0xFF". However I experienced some problems with a ModbusServer to set it to "0", thats why I changed the default setting to "1". But I think I will change that in the future again to meet the specification.
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Hi Samuel, what you could try is either to call the "connect()" method outside the loop, or after reading the values to disconnect. somthing like: public static void Main(string[] args) { ModbusClient modbusClient = new ModbusClient("127.0.0.1", 502); for (int i = 1; i > 0; i++) { modbusClient.Connect(); int[] readHoldingRegisters = modbusClient.ReadHoldingRegisters(0, 10); Console.WriteLine("Value of A " + " " + readHoldingRegisters[0].ToString()); Console.WriteLine("Value of B " + " " + readHoldingRegisters[1].ToString());...
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Hi, could you attach some sourcecode?
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Hi could you try to set the "unitIdentifier" to "0" or "0xFF" (Try both)
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Hi, this is the correct way to change a holding Register programatically. Take care that the Modbus connection does not overwrite your register, and that the Registers, you request to read by the client, are shifted by "-1". If you want to read holding Register "1", you have to send a request Read Holding Registers with startingAddress "0".
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Hi, unfortunately echos has to be avoided (correct wiring, Resistors at the end of a line), since there are no measures taken to detect echos.
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Hi, unfortunately echos has to be avoided (correct wiring, Resistors at the end of a line), since there are no measures taken to detect echos.
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Hi, i am not sure if I understood what you mean. There is no way to avoid that an...
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Hi, unfortunately it is not that easy to create a PCL Library, because PCL does not...
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Hi, it seems that your Project for some reason requires a strong named dll. The Easymodbus...
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Hi! yes I see! There was a mistake setting the timeout! Thanks!! I will upload the...
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Hello, I am not sure if I understood what you mean. You have to create Server and...
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Yes, it is possible to log the data in a MySQL database.
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Methods ModbusClient
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Methods ModbusClient
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