A module LB-487 is used for collection and registry of measurement
data. It is equipped with 8 inputs, where each can be individual and
independent form the others, configured to work in the following modes:
- S300 - allows on attaching any sensor
with an interface S300,
- thermometer - allows on temperature measurement using an
outside thermistor probe in the scope -50 .. +150 °C,
- 0-10V - an analogue input, allows on voltage measurement in the
scope 0-10V,
- 0-10V scaling - an analogue input, allows on voltage measurement
in the scope 0-10V with an additional calculation using the
coefficients from the linear
equation ax+b, what allows on a change in voltage measurement result in
V to
an adequate scale and unit,
- 0-20mA - an analogue input, allows on current measurement in the
scope 0-20mA,
- 0-20mA scaling - an analogue input, allows on current measurement
in the scope 0-20mA with an additional calculation using the
coefficients from the linear
equation ax+b, what allows on a change in current measurement result in
mA to
an adequate scale and unit (i.e. with a
sensor 4-20mA it is possible to
calculate the scope 4-20 to i.e. 0-100,
taking into
consideration additionally zero
offset and scale calibration),
- binary - allows on attaching a short circuiting / open circuiting
switch,
- status – allows on attaching a short circuiting / open circuiting
switch with an additional detection of the alarm states of short and
open line circuiting,
- rain gauge –
allows on connecting a rain gauge (i.e. type
ARG100 or RG50) - only input no. 1
(what means that LB-487
module serves only one rain gauge).
LB-487 module collects measurement data from the inputs and next
makes them available through its communication interfaces.
Additionally, the collected data can be with a set period registered in
the internal memory.
INTERFACES
Including LB-487 module in a measurement system or connecting it to
a PC computer is possible using communication interfaces. Ethernet is a
standard interface, which works in the modes 10/100 Mbit/s. Optionally,
it is possible to equip LB-487 module with two additional ports of the
communication interfaces, where each can be:
Such variety of the interfaces assures very high module attachment
elasticity, which allows on its application practically with every
existing measurement system. Attaching two additional ports creates a
possibility of providing LB-487 module with maximum 3 communication
interfaces (including the Ethernet interface, which is assembled in
standard). All 3 interfaces can work simultaneously and totally
independent from one another.
PROTOCOLS
LB-487 module serves standard communication protocols, what allows
on simple integration with random measurement systems and existing
software. The following protocols are served (some protocols are
attributed to certain types of the interfaces):
- MODBUS/TCP (Ethernet)
- MODBUS/RTU (RS-232/RS-485)
- SNMP (Ethernet)
- HTTP (Ethernet)
Serving MODBUS protocol allows easily on including LB-487 module in
the systems served by SCADA class software. SNMP protocol allows on
easy access to measurement data in a form of MIB variables from the
software level of IP network management. HTTP protocol allows on easy
data monitoring directly in WWW browser.
REGISTRY MEMORY
Collected data can be periodically registered through LB-487 module
in the internal memory. The memory’s volume (counted in data records)
depends on the inputs’ configuration, number and types of the attached
sensors.
The registry memory allows on creating an archive of measurement data
and later review of the results at a convenient moment. The memory is
protected against content loss in case of lack in power supply – LB-487
module is equipped with internally sustained power supply of the memory
registry. Each registered parameter has its time of registry, obtained
from the internal real time clock. The clock works in a constant way
also in case of lack in outside power supply.
Registry memory volume
Registry memory volume: (counted in data records, where a data record
is understood as a set of data from all outputs saved at that moment)
it can be determined in the following way:
S1..S8 - wielkość bloku danych dla poszczególnych wejść
S - wielkość pojedyńczego rekordu
N - pojemność pamięci rejestracji liczona w rekordach
S1..S8 =
wejście wyłączone: 0
wejście 0-10V: 2
wejście 0-20mA: 2
termometr: 2
wejście binarne: 1
wejście stanowe: 1
S300:
LB-710: 13
LB-715: 18
LB-716: 11
LB-746: 13
LB-850: 21
LB-900: 16
LB-901: 23
LB-905: 17
LB-910: 16
LB-920: 16
LB-921: 17
S = 16 + S1 + S2 + S3 + S4 + S5 + S6 + S7 + S8
N = 131040 / S zaokrąglone w górę do liczby parzystej
As an example, in the following outputs configuration:
output 1 - thermometer
output 2 – measurement 0-10V
output 3 – binary
output 4 - S300 LB-715
output 5 - S300 LB-900
output 6 – switched off
output 7 - switched off
output 8 - switched off
Registry memory volume is the following:
S1 = 2
S2 = 2
S3 = 1
S4 = 18
S5 = 16
S6 = 0
S7 = 0
S8 = 0
S = 16 + 2 + 2 + 1 + 18 + 16 + 0 + 0 + 0 = 55
N = 131040 / 56 = 2340 rekordów
ALARMS
LB-487 module allows on defining 16 independent alarms for measured
data. For each alarm there are set:
- association with a measured value for which the alarm is to be
signaled,
- upper and lower threshold (exceeding of upper and lower threshold
is signaled),
- minimum exceeding durability time (allows on filtering temporary
changes that in a certain application should not be signaled),
- an alarm output (each one of the alarms cab be signaled using a
transmitter, depending on configuration of the transmitter modules,
available are 2 or 4 transmitters),
A possibility of associating each alarm with any measured data
allows on setting i.e. individual alarms for 16 various data or in an
extreme case 16 independent alarm alarm intervals for one measured
value.
Alarm signaling has a delay function – after alarm signaling, a user
can delete an alarm (a key button on the front part of the module’s
casing), what results in a delay of an alarm situation to a programmed
time.
If until that time a cause for an alarm does not pass then it is not
signaled any more. When a time of delay passes and a cause of an alarm
does not pass than the alarm is signaled again.
DEDICATED SOFTWARE
The device is offered additionally with software
for a PC computer with the Windows systems
- program LBX, which allows
on:
- presentation of current readouts from the devices,
- devices’ control – access to settings and all functions,
- alarms’ monitoring and their signaling,
- data archive presentation – graphs, reports, histograms,
- data archives’ management,
- assuring access to remote clients.
POWER SUPPLY
LB-487 module in standard is powered from an outside 12V feeder.
Such
way of powering allows on simple use of accumulator power supply in the
systems where there is such a need.
Additionally, LB-487 can be equipped with a power supply module POE
– which allows on application of the Ethernet cable, which provides
power supply, with no need of using an outside network feeder. Such
option allows on simplifying the installation, eliminating the
necessity of attaching to a power network i.e. in places where it is
not available of it is not convenient. Using POE power supply requires
applying an adequate network infrastructure – the network switches used
have to be with POE type ports or it is also possible to apply a
midspan feeder.
