JonathanS Posted January 5 Report Share Posted January 5 Hello, I am familiar with Modbus and have used it before from a vision slave PLC to a Unistream Master PLC. However, i now seem to be encountering issues when trying to communicate from one to the other. The Slave PLC is a V570-57-T20B-J with an V200-18-E1B Module and an Ethernet card added in being a V200-19-ET2. The Master PLC is a US5-B10-T24. Is there a special way I need to set up the ethernet card added into the Vision PLC as I have copied program logic used previously on already in built ethernet PLCs to get an Modbus communication error showing on the Unistream PLC, Status 3 on the Unilogic software, meaning there is communication but the commands arent set up correctly. And I cannot seem to figure out what is wrong with the Visilogic program. As seen in the attachments I have the code for visilogic with MI0 Flow Test value linked to the screen to be able to manually change the number to see it on the unilogic program. On the Unilogic program I am reading address 0. All IP addresses and ID numbers etc all are aligned as they should be. Any advice would be greatly appriciated. 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.