Rockwell Automation 22C PowerFlex 400 AC Drive FRN 1.xx - 7.xx - Manual (Page 197)

PowerFlex 400 Adjustable Frequency AC Drive FRN 1.xx - 7.xx User Manual
Publication 22C-UM001I-EN-P
Appendix
F
Metasys N2
Appendix F provides information about controlling a PowerFlex 400
drive, setting its Reference, and accessing its parameters through
configurable objects when the Metasys N2 network protocol is selected.
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 internal Metasys protocol firmware 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).
The Metasys N2 master also performs cyclic polling of all the virtual
objects.
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 F.1 ).
Topic Page
Understanding Metasys N2 F-1
Network Points F-3
Using Percent (%) for the Reference F-5
Using Metasys Configurable Objects to Access Parameters F-6
Understanding Metasys N2
ATTENTION: Risk of equipment damage exists. If a controller is programmed to
write parameter data to Non-Volatile Storage (NVS) frequently, the NVS will quickly
exceed its life cycle and cause the drive to malfunction. Do not create a program that
frequently uses configurable outputs to write parameter data to NVS unless C107 [Comm
Write Mode] is set to option 1.