Rockwell Automation 20-COMM-H RS485 HVAC Adapter FRN 2.xxx - Manual (Page 47)

20-COMM-H RS-485 HVAC Adapter User Manual
Publication 20COMM-UM009D-EN-P
Chapter 5
Using Metasys N2
This chapter provides information about controlling a PowerFlex 7-Class
drive, setting its Reference, and accessing its parameters through
configurable objects when the Metasys N2 network protocol is selected.
Understanding Metasys N2 Metasys nodes are built up by the use of several virtual objects. The
Metasys N2 master performs read and write commands to these virtual
objects, and the adapter transfers/translates the data between these virtual
objects and the drive.
When a read or write command occurs to a certain dedicated virtual object,
data in the virtual objects is refreshed from or transferred to the drive.
The Metasys N2 master performs read and write commands to the virtual
objects one at a time. The data types that are used in the virtual objects are
binary input (BI), binary output (BO), analog input (AI), analog output
(AO), and internal integer (ADI), which is a 16-bit data value.
The Metasys master also performs cyclic polling of all the virtual objects.
Device Identity
The 20-COMM-H adapter must be configured in the master controller as a
Vendor device (VND) Code 10 hex.
Metasys N2 Virtual Objects
A Metasys N2 node may contain up to 256 virtual objects in each of its
seven different data types, called regions (
Table 5.A ).
Topic Page
Understanding Metasys N2 5-1
Using the Metasys N2 Point Map for I/O 5-3
Using Metasys Configurable Objects to Access Parameters 5-8
TIP: Datalinks can also be used for accessing parameters. For information
about using Datalinks, refer to
Chapter 7 , Using Datalinks with All
Protocols .