Modbus communication can read parameter data from the controller and write parameter data to the controller. The parameter Modbus addresses are not listed in the Modbus tables. The Modbus address for a parameter is calculated by adding an offset to the first number in the address area. The offset is the parameter Address in the Utility Software (USW).
Modbus communication can also read and write alarm data for IOs and CIOs. The IO Modbus addresses are not listed in the Modbus tables. The IO Modbus addresses are also calculated by adding an offset to the first number in the address area.
This chapter lists the address areas, and gives examples of Modbus address calculations.
Note: The DEIF controller is the Modbus server.