Rockwell Automation 20-COMM-H RS485 HVAC Adapter FRN 2.xxx - Manual (Page 58)

6-2 Using Siemens Building Technologies P1 FLN
20-COMM-H RS-485 HVAC Adapter User Manual
Publication 20COMM-UM009D-EN-P
P1 FLN Point Types
Logic analog and digital I/O points are used for controlling the drive,
monitoring status, and reading/writing parameters.
Table 6.A shows the four
point types.
Some points can be unbundled. Unbundle means that you can characterize
the subpoint so that three additional items can be enabled for that specific
subpoint:
•
The subpoint can be monitored for COV (Change of Value). All
unbundled points are reported for any change of value when a “Scan for
COV” command is issued. (Analog points may have COV limits defined
to reduce network traffic.)
•
The subpoint can be overridden by the operator.
•
Unbundling a point allows the operator to set up a virtual point in the
controller's database, which when commanded, can also affect the
subpoints in the device.
Table 6.A Point Types
Abbreviation Name Used for
LDI Logical Digital Inputs Reading bit level points (0 or 1) such as drive status. For
example, FWD.REV MON (point 21) provides the status of
the rotation direction of the drive.
LDO Logical Digital Outputs Writing bit-level points (0 or 1) such as drive commands. For
example, CMD RUN.STOP (Point 24) commands the drive
to run.
LAI Logical Analog Inputs Reading word-level points such as FREQ OUTPUT (Point
03) and CURRENT (Point 06).
LAO Logical Analog Outputs Writing word-level points such as REFERENCE (Point 92)
and acceleration (Point 31).