Definition
A node represents a physical control device in the process (typically a PLC). Each node has a logical node number that is used by IGSS to identify the PLC.
When IGSS knows this number, it can associate the correct process values with the corresponding process components (which are connected to the PLC).
Example: An IGSS network
The figure below shows a simple IGSS network with a server, two operator stations and three PLCs (nodes). Each node has a logical node number that identifies it in the system – the IGSS node number.
Identifying the node
When you define a process component in the Definition program, you must indicate which PLC (node) it is connected to. This is done on the Edit Mapping tab of the object properties dialog box. Open the dialog box by double-clicking the symbol representing the process component.
For further details click here.