As a slave, the NA9173 fieldbus node establishes the connection between the
the FnIO system and the Modbus RS485 fieldbus.
The I/O modules used are automatically recognized and the fieldbus node
fieldbus node creates a local process image. The internal
process image of the NA9173 fieldbus node is transferred via the MODBUS
RS485 fieldbus in the memory of the respective controller responsible.
controller. By dividing the process image into an input and output
input and output data areas, the process data is read in via the
read in via the MODBUS, processed further in a control system and the
process output data is output via the MODBUS.
The automatically generated process image is created in the order of the expansion
expansion modules in their slots.