MVP 2021 Flex727 Posted October 8, 2015 MVP 2021 Report Share Posted October 8, 2015 When using VisiLogic, I monitor and display system operands SB 143-150 and SDW 14-21 to know that communications are proceeding as expected. Is there any equivalent in UniLogic? How can I know that MODBUS IP communications are working properly (i.e. connected and exchanging data)? Quote Link to comment Share on other sites More sharing options...
Alexander Posted October 15, 2015 Report Share Posted October 15, 2015 There is not a socket connected but each master and slave configuration will have a struct that contains the sessions, successes, and failures which indicate if they are running and if everything is working correctly. Quote Link to comment Share on other sites More sharing options...
MVP 2021 Flex727 Posted October 15, 2015 Author MVP 2021 Report Share Posted October 15, 2015 Thanks! Got it working well. Is there a plan to allow updating the IP address for a MODBUS IP slave PLC through ladder or operator interaction? In other words, if IT makes a change to the IP addressing, I want the customer to be able to make the update without me having to provide a program update (something easily done in VisiLogic). Quote Link to comment Share on other sites More sharing options...
MVP 2021 Flex727 Posted October 16, 2015 Author MVP 2021 Report Share Posted October 16, 2015 Is there a plan to allow updating the IP address for a MODBUS IP slave PLC through ladder or operator interaction? In other words, if IT makes a change to the IP addressing, I want the customer to be able to make the update without me having to provide a program update (something easily done in VisiLogic). Bumping this in the hope of getting an answer to my second question. Currently the IP address of a UniStream PLC can be changed by an operator, but if the PLC is addressing a MODBUS Slave, and the Slave's address is changed, the address the Master is using to communicate with the slave cannot be changed except by the programmer. Is there a plan to improve this? Quote Link to comment Share on other sites More sharing options...
Alexander Posted October 19, 2015 Report Share Posted October 19, 2015 Currently the only way to modify the slaves IP address to use the advanced Modbus function blocks, and is not available within the basic Modbus configuration. These settings are not enabled by default but can be added by navigating to the Project menu, selecting Options, then enabling the check box for the Modbus advanced ladder functions. There is also an example project available. Please send an email to support@unitronics.com and we would be happy to send it to you. This requires the ladder to manually connect using the TCP/IP connect block, and then build a struct of information for the Modbus commands. This would allow the IP address of the slave device to be dynamically changed. Quote Link to comment Share on other sites More sharing options...
MVP 2021 Flex727 Posted October 19, 2015 Author MVP 2021 Report Share Posted October 19, 2015 Thanks, Alexander. Quote Link to comment Share on other sites More sharing options...
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