Rockwell Automation Publication 22C-UM001J-EN-E - January 2017 175
Appendix F
Metasys N2
This appendix 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.
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
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 (Tab l e 34
).
For information on... See page
Understanding Metasys N2 175
Network Points 177
Using Percent (%) for the Reference 180
Using Metasys Configurable Objects to Access Parameters 181
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.
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