A graphic LCD displays monitored
data as trends, bar graphs and engineering units. Three adjustable alarm
levels are provided per channel. Relay outputs allow control of beacons
horns and other alarm events. A horn relay may be set for steady or
pulsing operation. Nonvolatile memory retains all configuration data
indefinitely.
Analog inputs may be accepted and
conditioned via sensor specific analog input cards. Alternatively, the
standard Modbus Master port allows input data to be retrieved from
Modbus slave devices including the many Modbus compatible Honeywell
Analytics sensor transmitter products.
The HA71 is easy to configure and
user friendly. Measurement ranges in engineering units, adjustable alarm
set-points, dual serial interfaces and many other features combine to
allow the HA71 satisfy the needs of many demanding applications. It is
widely used for centralizing the display and alarm processing functions
in critical multipoint monitoring applications. The optional HA-71-HMI
(Human Machine Interface) software provides complete data display and
storage, with real-time channel data available in 24-hour or 15-minute
trends, including historical alarm and maintenance data.
A RS-485 Modbus slave port allows up
to 128 HA71’s to be multidropped onto a single data highway for
interrogation by another Modbus master. HA71’s may also be cascaded by
connecting one unit’s master port to another’s slave port and others are
added by connecting appropriate 8 channel boards (2 required for more
than 8 channels) to the economical I2C expansion bus. Familiar
“telephone style” cables and connectors interface to this bus. This
method allows versatile system configuration of options satisfying the
most unusual user applications.
HA71 facilitates monitoring of ambient gas detection, rotating machinery, tank levels, flow, temperature and other controls.
