HRW HPD0440BNMR V401 Manual 111116.doc E. & O. E. / Subject to change without notice
Page 5 of 43
Operation Overview
All physical inputs, outputs and internal logic & control function blocks, and critical control loop
parameters are numerically represented as an ‘Object’. The object is a function block’s output value.
Depending on the purpose of a function block the object may have a range of sub-parameters available
for defining the block’s function and the operational features & limitations of the function. In the case of
control loops the active set point, the proportional band and the integral time sub-parameters are also
represented as objects for network access and remote tuning of a control loop if required.
In this document the term ‘Objects’ will mainly be used in the context of BACnet networks but will
otherwise be referred to as a ‘point’ or ‘points’ when discussing specific control applications.
The process of setting up function blocks and connecting function blocks to form an application uses
simple text lines therefore it is not necessary to learn a complex programming language. The settings
may be manually typed in to the device or, using the
FUNCPROG 110601
programming tool which
provides a visual representation of each block, an application text file may be created, saved and
downloaded to the device as a complete group of settings.
The ability to make single setting changes directly at the device makes for easy debugging and
commissioning.
The function blocks comprise:
Physical I/O for connection of input switches, sensors and output control devices
Virtual inputs for taking over external commands and values from other network devices or for
manual settings and overrides
Logic blocks for event based reactions and influences
PI Control Loop blocks for set point based control reactions
In all cases points may be manually overridden for testing & commissioning purposes or for service
override. In respect of BACnet priority arrays manual overrides are Priority 9 (factory default = Null /
internal program control = 16).
Connection to the device for programming and service is via a terminal program such as HyperTerminal
(recommended). While on-line to the device it is possible to view point statuses and where applicable,
any dependent or influencing point’s connections. Statuses are updated live to the terminal screen
every 10 seconds or manually refreshed any time by pressing the enter key.
In additional to the predefined point displays a user-defined display is available for a customised point
summary related to an application. The user display may contain up to 32 lines of user text with or
without dynamic points included.
The user has the freedom to specify own display text in up to 32 lines with or without dynamic object
displays. Text lines may be programmed to be invisible until a specific object (or group of objects) met a
predefined criteria at which time the text will ‘pop-up’ at the top of the display. When the predefined
criteria is no longer true then the text will no longer be displayed. This feature is designed for use as
alarm indication and can be used together with the programmable LED’s and audible beeper to raise
attention to an alarm situation.
