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Laboratory Electronics

DATA COLLECTION MODULE LB-487

  • 8 inputs, each can work in a mode:
    • random sensor S300
    • thermometer
    • voltage measurement 0-10V
    • current measurement 0-20mA
    • binary/ status output

  • communication interfaces:
    • in standard:
      • Ethernet 10/100 Mbit/s
    • optionally, 2 additional modules:
      • USB
      • RS-232
      • RS-485

  • standard communication protocols:
    • MODBUS/TCP (Ethernet)
    • MODBUS/RTU (RS-232/RS-485)
    • SNMP
    • HTTP (data view through www)

  • registry memory:
    • in standard:
      • capacity 128kB
      • battery sustained content when the power supply is switched off
      • real time clock
    • optionally:
      • record on a standard SD memory card
      • random capacity
      • data readout using a reader directly from a PC 

  • alarm signaling:
    • 16 independent alarms
    • signaling using a transmitter module
    • sending out the communicates "trap" SNMP

  • software for a PC with Windows
LB-487 przód
LB-487 tył

DESCRIPTION

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:

  • USB
  • RS-232
  • RS-485

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.

TECHNICAL DATA

DATA COLLECTION MODULE LB-487
Measurement inputs
S300 compatibility: random data source in a digital current loop standard
data transmission: 300bps 7/N/1
temperature sensor: thermistor GE-TK95
measurement scope: -50...+150°C
measurement inaccuracy in the scope: -15...+70°C: +/- 0,2°C
measurement inaccuracy in the scope: -35...+100°C: +/- 0,5°C
measurement inaccuracy in the scope: -50...+150°C: +/- 2°C
measurement resolution: 0,1°C
0-10V measurement scope: 0,00-10,00V
measurement resolution: 0,01V
measurement inaccuracy: 0,02V
0-20mA measurement scope: 0,00-20,00mA
measurement resolution: 0,02mA
measurement inaccuracy: 0,04mA
binary
short circuit/ open circuit status detection
status short circuit line: R = 0 .. 2k6
short circuit contact: R = 2k6 .. 8k06
open circuit contact: R = 8k06 .. 24k
line break: R > 24k
rain gauge
(only one input #1)
impulses’ counting
Interfaces Ethernet 10/100 Mbit/s, full-duplex / half-duplex, flow-control
POE (optionally upon request)
USB
version: 2.0
galvanic isolation
RS-232 format: 8 data bits, evenness bit: lack, evenness, unevenness, 1 stop bit
speed: 9600, 19220, 38400, 57600
lines: GND, RXD/TXD, RTS/CTS
galvanic isolation
RS-485 format: 8 data bits, evenness bit: lack, evenness, unevenness, 1 stop bit
speed: 9600, 19220, 38400, 57600
galvanic isolation
Memory registry
registry period 1-60000 seconds
set with 1 second resolution
memory capacity
128kB
number of records - see a description in the text
Power supply outside feeder
power supply voltage: 12V DC
energy consumption: max. 200mA
POE (Power Over Ethernet)
(optionally upon request)
36..57V
class 1 (max 3,84 W)
power supply of through data lines 1-2/3-6 or through not used 4-5/7-8 
Overall dimensions
metal casing
148 x 102 x 46 mm