NOVUS AUTOMATION
83/85
Accuracy
: The sensor accuracy reading is measured in relation to the Full Scale and is proportional to the maximum measuring range of each
sensor. For a Pt100 sensor, for example, which the
LogBox Wi-Fi
can read in the range of -200 °C to 650 °C, with a precision of 0.15%, the
accuracy in °C will be (650 °C – (-200 °C)) * 0.15% = 1.28 °C.
Thermocouples
: The analog input circuit for the
LogBox Wi-Fi
guarantees the accuracy specified in the Thermocouple sensors reading with a
maximum cable impedance of 100 Ω. Thermocouple sensors with impedance above 100 Ω are read by
LogBox Wi-Fi
. Accuracy, however, is not
guaranteed. For reading the thermocouple sensors, the
LogBox Wi-Fi
uses the internal temperature sensor for Cold Joint compensation (NTC).
Just as with the internal temperature sensor, thermocouples may present a greater error than specified when there are sudden variations in
ambient temperature. The specified accuracy is only guaranteed when the device is installed in an environment with a stable temperature for a time
greater than one hour.
Pt100
: The
LogBox Wi-Fi
analog input circuit guarantees the accuracy specified in the reading of PT100 type sensors with a maximum cable
resistance of up to 25 Ω. The device can read sensors with cables that have resistance above 25 Ω. In these cases, the accuracy and
measurement range are not guaranteed. The
LogBox Wi-Fi
performs the cable resistance compensation internally, if it is the same in the three
wires that connect the device to the sensor.
Linear 0 to 50 mV:
The analog input circuit of the
LogBox Wi-Fi
guarantees the specified accuracy when reading electrical quantities of voltage
type 0 to 50 mV with a maximum cable impedance of up to 100 Ω. Voltage sources with series impedance above 100 Ω can be read
by
LogBox
Wi-Fi
. Accuracy, however, is not guaranteed.
Linear 0 to 5 V and 0 to 10 V:
The analog input circuit of the
LogBox Wi-Fi
guarantees the specified accuracy when reading electrical quantities
of voltage type 0 to 5 V and 0 to 10 V with a maximum cable impedance
of up to 200 Ω. Voltage sources with series impedance above 200 Ω can
be read by
LogBox Wi-Fi
. Accuracy, however, is not guaranteed.
Linear 0 to 20 mA and 4 to 20 mA:
All
LogBox Wi-Fi
input channels have common ground with each other as well as with the power supply
source. Thus, for the
LogBox Wi-Fi
to be able to correctly measure the current transmitters, it is necessary that they are fed by isolated sources or
by using all current transmitters with the interconnected ground.
Digital Input
: All
LogBox Wi-Fi
input channels have common ground with each other as well as with the power supply source. For the
LogBox
Wi-Fi
to correctly measure the Digital Input sensor, such characteristic must be considered. For the logic levels of the sensor connected to the
d
igital input to be correctly detected, it is recommended that the maximum series impedance with the sensor is less than 10 kΩ
.
Internal Temperature Sensor
: The
LogBox Wi-Fi
has an internal temperature sensor of the NTC type that can be used for monitoring the ambient
temperature. This sensor is used for the Thermocouples Cold Joint compensation. Because it is located inside the device’s casing, it may present a
greater error than specified when there are abrupt variations in ambient temperature. The specified accuracy is only guaranteed when the device is
installed in an environment with a stable temperature for a time greater than one hour. The sensor allows readings in a range of -40 °C to 125 °C.
The temperature, however, is limited to the device’s operating range.
19.2
WIRELESS CONNECTIVITY
LogBox Wi-Fi
has a wireless connectivity module for communicating with 2.4GHz 802.11 b/g/n Wi-Fi networks. The Wi-Fi connectivity module
used is AES-BCM4343W-M1-G, from manufacturer Avnet, which provides data connectivity over Wi-Fi.
FEATURES
DESCRIPTION
WLAN Standards
IEEE 802 Part 11b/g/n (802.11b/g/n single stream n)
Antenna Port
Supports single antenna for Wi-Fi
Frequency Band
2.400 – 2.484 GHz
Table 19 –
WLAN standards supported by
LogBox Wi-Fi
FEATURES
DESCRIPTION
Frequency band
2.400 – 2.497 GHz (2.4 GHz ISM Band)
Number of selectable sub-channels
14 Channels
Modulation
OFDM, DSSS (Direct Sequence Spread Spectrum), DBPSK, DQPSK, CCK, 16QAM, 64QAM
Supported rates
1, 2, 5.5, 11, 6, 9, 12, 24, 36, 48, 54 Mbps e HT20 MCS 0~7
Maximum receive input level
-10 dBm (with PER < 8 % @ 11 Mbps)
-20 dBm (with PER < 10 % @ 54 Mbps)
-20 dBm (with PER < 10 % @ MCS7)
Output power
17 dBm @ 802.11b
13 dBm @ 802.11g
12 dBm @ 802.11n
Carrier frequency accuracy
+/- 20 ppm (Crystal: 26 MHz +/- 10 ppm @ 25 °C)
Table 20 –
WLAN Specifications of the Wi-Fi Connectivity Module
