LB-489 acts as data acquisition module, collecting measurement data from
attached sensors. Measurement results are then made available for outside world
via Ethernet port and diverse selection of communication protocols and data
formats.
Example usage
-
Server room monitoring: temperature measurement in various places,
humidity measurement, wet condition sensing (water flood), door/security
sensor.
-
Small weather station: measurement of air temperature and humidity,
atmospheric pressure, wind direction and velocity, sun radiation.
-
Local temperature measurement: 4 independent, simple and cheap
thermistor probes.
-
Multipoint temperature measurement: four 8-input LB-711 hubs allow
for attaching 32 independent, precise 4-wire Pt sensors.
Sensor inputs
LB-489 module is equipped with 4 inputs. Every input can be individually
and independently of other inputs configured for the following sensors:
Thermometer
Thermometer input allows for temperature measurement in the range
of -60 .. +150 °C, by the means of
external thermistor sensor.
Dedicated sensor with specially selected
thermistor assures optimal measurement accuracy of 0.1 °C in the range of
-30 .. +100 °C, and 0.5 °C in the remaining range.
Thermistor sensor is optimal and economical solution to temperature measurement
in most of the cases. When there's requirement for more precision, wider
temperature range, long distance from sensor to data acquisition module,
or special Certificate of Type for legal purposes, then wide range od S300
sensors is available for such purposes.
S300
S300 input allows for connection of any sensor equipped with
S300 interface.
S300 is a digital current loop interface, utilising 2-wire sensor connection,
allowing for significant distace from sensor to data acquisition module.
S300 interface simultaneously supplies power to the sensor, and measurement
data in digital form from sensor to the data module.
Example sensors:
-
LB-710 - hytherograph (temperature & humidity),
or other LB-710 compatible devices:
- LB-710T - thermometer,
- LB-710E - extended range thermometer,
- LB-711 - 8-channel thermometer,
- LB-715 - thermometer-hygrometer-barometer,
- LB-716 - barometer,
- LB-716P - absolute pressure sensor,
- LB-716D - differential pressure sensor,
- LB-746 - wind speed and direction,
- LB-747 - wind speed and direction,
- LB-750 - laboratory barometer,
- LB-781 - road sensor,
- LB-797 - soil hygrometer,
- LB-850 - CO2 and temperature sensor,
- LB-900 - sun radiation meter,
- LB-901 - 2-channel sun radiation meter,
- LB-905 - O2 and other gases sensor,
- LB-910 - surface hygrometer / water flood sensor,
- LB-920 - soil hygrometer,
- LB-921 - universal A/D converter.
Voltage measurement
Voltage input allows for 0..3V voltage measurement (or any other, for example
0..10V, using external resistor divider).
Binary
Binary input allows for sensing of dry contact. it can be NC/NO contact,
for example door security switch, or any other circuit that acts as switch.
Dry contact with sabotage detection
Sabotage detection allows for differentiating between open/close state of
attached contact, and line sabotage that results in short/open condition.
Ethernet interface
Ethernet interface allows for connecting LB-489 module to data transmission
network. It's possible also to connect it directly to the PC.
Ethernet interface works with 10 or 100 Mbit/s data rate.
POE (Power Over Ethernet)
is a production option for LB-489 data module.
POE greatly simplifies installation.
There's no need for separate power supply near the module, which
is powered over Ethernet cable.
Protocols
LB-489 module supports standard communication protocols. It allows for
simple intergration with any measurement and control systems, that
utilize the following protocols.
IPv4/IPv6
IPv6 support enables use in current and future networks operating this
new generation IP protocol. Investment in LB-489 module is future-proof,
allowing for no second thought about infrastructure upgrade when the IPv6
will be used in current IPv4 networks.
IPv6 Stateless Address Configuration (SAC) is supported and allows for almost no setup when connecting
the LB-489 data module to IPv6 network.
HTML/HTTP
LB-489 data module acts as a web server, providing simple WWW page with
current data view in any WWW browser. Data is automatically refreshed,
so the view stays current all the time.
JSON/HTTP
LB-489 data module serves all the measurement data in
JSON data format, over the HTTP protocol.
Typical usage covers the whole variety of web applications, that speak JSON.
lb489-json.php is an example PHP script,
showing how simple it is to retrieve measurement data from LB-489 module
and embed it in the custom WWW page.
XML/HTTP
LB-489 data module serves all the measurement data also in
XML data format, over the HTTP
protocol.
Typical usage is similar to JSON - web applications that speak XML. But that's
not the end of possibilities. Any system that can retrieve chunk of data
over HTTP protocol and parse JSON or XML can easily get the measurement data
from LB-489 module.
SNMP
LB-489 data module supports
SNMP protocol,
typically for
NMSs.
SNMP monitoring provides specific information about network interface state,
and readout of all measurement data.
Typical usage, as server room environmental conditions monitoring,
allows for temperature and humidity sensing, water flood detection,
door security watch, etc.
It's possible to set alarm thresholds for every measured parameter.
Detection of alarm conditions results in sending SNMP TRAPs to NMS system.
NMS system later processes these TRAPs, alerting appropriate staff.
MODBUS/TCP
LB-489 data module serves all the measurement data as MODBUS variables
over TCP protocol, according to Modbus Organizations specs.
MODBUS/TCP allows for simple connection of LB-489 data module to
SCADA systems.
Alarms
LB-489 data module keeps 32 independent alarm thresholds for measurement data.
Alarm events are sent out as SNMP TRAPs and emails (SMTP).
Every alarm is defined as:
- measurement result pointer,
- low and high threshold,
- minimum duration (for filtering out transient conditions).
Every alarm can be connected with any selected measurement result.
It's possible to define 32 alarms for 32 independent results
(one result, one alarm),
or at the extreme opposite, 32 alarms for single result.
Dedicated software
LAB-EL company offers dedicated software for LB-489 module
- LBX application.
It provides:
- current data view,
- device control - all settings and other functions,
- alarm monitoring and alert execution,
- archival data collection and presentation - graphs, reports, histograms,
- archival database management,
- client-server architecture, allowing for remote access.
Power supply
LB-489 data module is powered through external 12V connector by default.
External power supply allows for connection to the mains line (230V 50Hz),
or one can connect the module to the low voltage line, for example with
battery backup in demanding installations.
POE
LB-489 can be equipped with internal POE module, as a production option.
POE allows for powering the data module via Ethernet cable, without any other
external power supply. Such option greatly simplifies installation,
especially in places where there's no access to the mains line - either
due to inconvenience (no easy access) or due to safety regulations.
POE usage requires special network infrastructure - switches must have
POE ports, or it's possible to insert the midspan power suppy into the cable
near the switch.
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