SUTHAN Posted March 3, 2018 Report Share Posted March 3, 2018 I am new to unitronics Visi logic software. i am using V1210 controller at site. i need to do an modbus 485 communication between an GE controller an V1210 controller here GE controller is an master and unitronics V1210 as an slave i need to sent all my MI and MB used values to GE controller. In this case i need to write my data to GE PLC i searched in unironics there is read block is present but write blocks are not there. how can i write my data to GE plc please guide me on this if you have any reference logic for the same please share with me. i already created logic for configure the modbus 485 communication and Port initialization logic. thanks in advance. Quote Link to comment Share on other sites More sharing options...
MVP 2022 Ausman Posted March 3, 2018 MVP 2022 Report Share Posted March 3, 2018 You have a master/slave issue here. And the magic word for looking at what you want is FBs/Modbus/Preset. You'll either have to have the GE poll (often) the V1210 slave periodically to get the updated MI & MB values, or implement a change in the slave/master relationship so that the 1210 can send them, using "Preset", as the Master, to the GE. The GE may have a function where it can act as Slave/Master, which would make this easy. Examples exist showing how to change the 1210 from master to slave, but labelled as "V130_Modbus_Master_Slave_switch". Other forum members might have a workaround, but to me this is the essence of the issue. cheers, Aus Quote Link to comment Share on other sites More sharing options...
MVP 2022 Flex727 Posted March 3, 2018 MVP 2022 Report Share Posted March 3, 2018 Ausman is correct (as usual). Only the Master can Read & Write. The Slave merely listens for requests from the Master and allows the registers to be Preset (written) or Read. The Slave cannot initiate action (at least directly). Quote Link to comment Share on other sites More sharing options...
SUTHAN Posted March 4, 2018 Author Report Share Posted March 4, 2018 Thank You Mr. Flex & Mr. Ausman Quote Link to comment Share on other sites More sharing options...
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