markw444 Posted February 20, 2019 Report Share Posted February 20, 2019 Hello, I apologize if this question has been answered; I've searched the forum and help files without any luck. I'd like to know where I can find information for MODBUS protocol to read from Data Tables. For context I have about a dozen Samba 7" controllers networked and connected to my PC (MODBUS TCP/IP). I wrote a C# application that pulls data from all the controller bits and registers with the standard MODBUS functions--everything works fine. Up until this point, the logic made minimal use of data tables, so I didn't have a reason to read data from them. Now, however, I need to read Data Table information. There is clearly a MODBUS function block for reading from data tables, but I haven't been able to find any information about the command sequence for this function that would allow me to implement it a Data Table read with a PC master. The "VisiLogic Software Manual: VisiLogic Function Blocks" make brief mention of the information I'm looking for: "Please note that this is not a standard MODBUS function. Read/Write from Data Tables is compatible with Unitronics' Vision PLC data tables only" Thank-you in advance for any useful information, Mark Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.