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By Gabriel Franco · Posted
In the Modbus IP Configuration FB, you can assign the IP address of the slaves to MI registers and then assign them from HMI If you are talking about Unistream Series (as I suspect you do), it is possible to modify the IP of the slaves from Uniapps rather than change program and download it to the PLC. -
It appears that I MUST hard code the client IP in order to use the native Modbus Functions. Otherwise, I am forced to use UDF's to access my Clients, and poll these through ladder to get values. Is this correct? Many times, the IP is unavailable, or Multiple identical controllers running the same program are supplied to customers. Currently, each program must be individually modified and uploaded to the HMI/PLC. Each of these HMI/PLC must be identified so installation occurs at the given machine. Much easier to simply changing a stored IP address for the slave. I would much prefer to use native Modbus functions. Will this be addressed? Is there a technical reason you do not allow the ModBus Client IP to be configured via ladder and HMI? -
By Gabriel Franco · Posted
Server (IP 10.0.60.1, as per your wrote) and client (IP 10.60.1.3) are in different networks. Why do you set mask to 255.255.255.240? It limits devices the PLC can talk to. In your code, Port 2 are set to wrong port number, should be 502. -
sorry for the terrible grammar I was in a hurry this morning. -
Hi I am trying to establish a Modbus client on a V700 to read from a Modbus server at: IP 10.0.60.1 Port 502 Slave ID: 1 Holding registers 100, 101, 102, 103, 104 Unfortunately, the V700 Ethernetcard never reaches to connect any socket to the slave (see attached Visilogic-file). Can anybody tell me, what I am doing wrong? Kind regards Stefan 230928 V9891 V700 Modbus Client.vlp
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