Modbus communication error
I want AC800M to work as a SLAVE on MODBUS.
I am inititaing MB Connet and get Error 5303
Clarify and suggest how i can connect a hmi to ac800M
By default AC800M could not be a slave for Modbus RTU.
MB Connect, as default, is used to connect a slave to AC800M, together with MB Read and Write.
Look in other posts in AKS for application, explaining how AC800M can work as a slave, also there is an application posted:
In ControlBuilder ver 6 you can specify the MODBUS type to "Master/Slave" on the Modbus (RTU) unit (see attachment). However the COM3 slave setup is only for point-to-point usage, add the CI867 unit for Modbus TCP and multidrop. The CI867 have also had slave functionality in previous versions (5.0/5.1).
Then you have to specify adress ranges and declare Access variables in the "Address" tab. If your AC800M is acting as a slave there is no use for the MBConnect block in the controller, simply configure your HMI-driver or use an OPC (like the Kepware Modbus Suite) to setup your master-end.