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Dr. Kindorf

Think 'N Do and Communication with Standard AD PLC's

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I have a facility where we have D2-260 PLC's installed for purposes of control and monitoring of equipment and processes. In the same facility there is a separate system that consists of several WIN PLC's that are connected to a Think 'N Do SCADA system for purposes of monitoring and trending various processes. We would like to give them access to our PLC's so that they can also read our process values ( i.e. memory registers) for the same purpose of trending data. I have not worked in any real depth with Think 'N Do, so I do not know if this can be done with PLC's other than Win PLCs. We have D2-260 CPU's and ECOM100 Ethernet modules in each backplane , and all of our PLC's are on the same physical network as the Think 'N Do PC. I believe that in TND software you would typically select a device to add, select the particular communication protocol for the device and then set up its particular parameters (such as IP address, etc.). I have a demo version of Think 'N Do, but it will only target Win PLCs in demo mode. Is what I describe possible, or would I have to install Win PLCs in each of our backplanes, and if so, could someone explain the necessary steps to allow them to access our CPU's so that I may properly outline it for them? A follow-up to this post: Using the Think 'N Do PC at the site, I was able to easily able to communicate with the standard D2-260 PLC's by simply adding a Modbus TCP Node, linking the PLC's to it, and reading the V memory addresses in Modbus. Thanks rlp122 for responding... Edited by Dr. Kindorf

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It can be done over MODBUS TCP. Is it easy? No. First it depends on what version of Think and Do you are at. Second it takes some programming on either the 260 or the TnD side. Possibly both. I personally have never tried to do this, although I know it is possible. My biggest suggestion with this is buy a support agreement with Think and Do and talk to their tech. He has done this many times and can help you out with the right steps to take.

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