Rockwell Automation 20-COMM-H RS485 HVAC Adapter FRN 2.xxx - Manual (Page 52)

5-6 Using Metasys N2
20-COMM-H RS-485 HVAC Adapter User Manual
Publication 20COMM-UM009D-EN-P
Table 5.M shows the analog outputs. These outputs must be used for writing
multi-bit commands and the Reference.
Additional Configuration Specific for Metasys N2
The Reference (AO#2) for Metasys N2 is set as a percentage from
-100…100%. However, the actual value transmitted over DPI is in an
engineering unit that equals the entered percentage. Parameter 29 - [N2
Ref Scale] determines the engineering unit value sent when AO#2 is set to
100%. The relationship is linear, where:
By default, Parameter 29 - [N2 Ref Scale] equals 32,767, which is the
maximum Reference value for PowerFlex 70/700 drives. Note that
additional scaling is performed in the PowerFlex 70/700 drive, where
32,767 equals the frequency selected in drive Parameter 55 - [Maximum
Freq]. For other DPI hosts, refer to the documentation of the specific DPI
host product.
Viewing the Logic Status and Feedback
On Metasys N2, there are two ways to view the Logic Status: binary inputs
(
Table 5.N on page 5-7 ) and an analog input ( Table 5.O on page 5-8 ). You
can use binary inputs when you need to view only one bit in the Logic
Status word. For example, to view whether a PowerFlex 70/700 drive is
ready (bit 0), you can use a binary input (BI 1).
When you need to view multi-bit fields in the Logic Status word, to view
the entire Logic Status word, or to view the Feedback word, you must use
an analog input. For example, to view the local control of a PowerFlex 70/
700 drive (bits 9…11), you must use an analog input (AI #1). To view the
Feedback, you must use an analog input (AI #2 or AI #3).
Table 5.M Logic Command and Reference: Analog Outputs
Network Point
Type (NPT) Network Point
Address (NPA) Parameter
Description
Range
AO 1 Product Logic
Command 16-bit word. Bit definitions for PowerFlex 70/700
drives are in
Table 5.L . For other products, refer to
their documentation.
AO 2 Reference -100.0…100.0%
100%
0%
Pr. 29 Value 0