Multidrop Communication in CI853
Hi, i have connected 15 Multi function meters in parallel using multidrop communication with CI853. So, how can i define all of them in CI853 com1, all MFMs has different Modbus IDs. So please tell me how to configure to get data of all MFMs.
Thanks in advance.
Voted best answer
You can look in the following application in AKS:
Basically, you have to connect modbus protocol to COM1 of CI853, then to create 15 pcs of MBConnect functional blocks, each with unique slave address of your metters. Then you have to create 15 pcs of MBRead blocks, each connected to the corresponding MBConnect block, to read the values from the meters. Good practice is to use slave address from 2 and up, usually 1 is the master COM port.
Please note - you have to use RS232 to RS485 transmitter, connected to COM1 port of the CI853, in order to use multidrop communication. Hope your metters are Modbus RTU with RS485 line.
There are also many similar questions about that matter in AKS, please look for that.