It will be referenced in our visual basic program. It can be downloaded at the following location:ĮasyModbusTCP is free software. Visual Basic 2015 is free and is part of Visual Studio 2015. In the table we will have five fields LogDate, LogTime, Register1, Register2, Register3. Our database will be named ACC_Database and it will be located at the following location: “C:\AccLog”. The next thing to do is set up our Microsoft Access 2010 Database.
Here is the PLC program that sets the three registers.Īccess 2010 Database Setup – Modbus Data Logging Data must move in and out of this area via the PLC program. This is because having direct access to the digital I/O can be dangerous when connected via Ethernet to the internet. Note: The Do More PLC uses the Modbus area to communicate. Coil/Register Numbers Data Addresses Type Do-More PLC Table Name 00001-09999 0000 to 270E Read-Write MC1 to MC1023 Discrete Output Coils 10001-19999 0000 to 270E Read-Only MI1 to MI1023 Discrete Input Contacts 30001-39999 0000 to 270E Read-Only MIR1 to MIR2047 Analog Input Registers 40001-49999 0000 to 270E Read-Write MHR1 to MHR2047 Analog Output Holding Registers The following is a table with all of the references for Modbus communications to the Do-More. This will correspond to register numbers 40001, 40002, and 40003. That will be MHR1, MHR2, and MHR3 in the Do-More PLC. The first three holding registers will be used.
#Java modbus server software#
The PLC software is available from Automation Direct as a free download.ĭo-More PLC Program – Modbus Data Logging This will be done by using a SQL command to insert the data.Īutomation Direct has a powerful simulator with their Do-More PLC. Using the free simulation software of the PLC Designer Software, we will retrieve three values of the Modbus Holding Registers using Modbus TCP. Once we have this information out of the programmable logic controller it will be placed in a Microsoft Access (2010) Database. We will communicate to an Automation Direct – Do-More PLC. Visual Basic 2015 will be used with the EasyModbusTCP client/server library for. VB.net Modbus Data Logging to Access Database The information collected in the database can then be distributed or analyzed in the future.
#Java modbus server code#
All code will be done and shown so you can implement this in your application with different parameters. We will log every minute into the database with the information that we collect from the PLC via Modbus TCP (Ethernet). Using Visual Basic 2015 we will log three holding registers from the PLC along with time and date into a Microsoft Access Database.
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