Rockwell Automation 20-COMM-H RS485 HVAC Adapter FRN 2.xxx - Manual (Page 57)

20-COMM-H RS-485 HVAC Adapter User Manual
Publication 20COMM-UM009D-EN-P
Chapter 6
Using Siemens Building Technologies P1 FLN
This chapter provides information about controlling a PowerFlex 7-Class
drive, setting its Reference, and accessing its parameters through points
when the Siemens Building Technologies P1 FLN network protocol is
selected.
Understanding Siemens
Building Technologies P1 FLN P1 FLN nodes are built by the use of several points. The P1 FLN master
controller performs read and write commands to these points, and the
adapter transfers/translates the data between these points and the drive.
All values (byte-sized, Boolean, and true integers) are represented in a
16-bit word over the network, where the sign bit is always positive. The
actual range allowed by P1 FLN, however, is always 15 bits: 0…32767 for
integers, 0…255 for bytes, and 0 or 1 for Boolean. The limit of 15 bits
prevents the use of the adapter’s P1 FLN mode with 32-bit DPI hosts, where
either Reference/Feedback or Datalink values are represented in 32-bit
format. 16-bit real values will be truncated to show only 15-bit values.
Topic Page
Understanding Siemens Building Technologies P1 FLN 6-1
Using the P1 FLN Point Map for I/O 6-5
Using the P1 FLN Point Map to Access Parameters 6-9
TIP: Datalinks can also be used for accessing parameters. For information
about using Datalinks, refer to
Chapter 7 , Using Datalinks with All
Protocols .
!
ATTENTION: Risk of injury or equipment damage exists. On
P1 FLN networks, 16-bit values are truncated to 15-bit values.
Unpredictable operation may result from using non-15-bit drive
parameters with the configurable points. Recognize the data
range limitation of P1 FLN and understand the data value ranges
of each parameter to be accessed over the network. Refer to the
drive user manual for information about drive parameter sizes.