WOBIT ADT42 User manual

PPH WOBIT E.K.J OBER. s.c.
62-045 Pniewy, Dęborzyce 16
tel.[phone], fax.[phone]
e-mail: [email protected]
www.wobit.com.pl
ADT42 User Manual
4-channel measuring module for force sensors
with 0-10V/4-20mA output, USB and RS485 MODBUS

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User manual -ADT42 –23.06.2015 –v.1.3
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Contains
1. Safety and assembly rules .................................................................................................... 3
1.1. Safety rules.............................................................................................................................. 3
1.2. Assembly recommendation..................................................................................................... 3
2. Device description................................................................................................................ 4
2.1 Intended use and properties................................................................................................... 4
2.2 Features................................................................................................................................... 5
2.3 Description of connectors and diodes..................................................................................... 5
2.4 Power supply ........................................................................................................................... 6
2.5 Force sensors connection........................................................................................................ 6
2.6 Insulated inputs....................................................................................................................... 7
2.7 Transistor outputs ................................................................................................................... 7
2.8 Analog output 0-10V/4-20mA................................................................................................. 7
3. Transducer configuration...................................................................................................... 8
3.1 Connection by USB .................................................................................................................. 8
3.2 Configuration of strain gauge inputs and measurements....................................................... 8
3.2.1 Example of configuration ................................................................................................ 9
3.3 Configuration of output and RS485....................................................................................... 10
3.3.1 Configuration of analog output..................................................................................... 10
3.3.2 Configuration of transistor outputs............................................................................... 11
3.3.3 Configuration of RS485 MODBUS.................................................................................. 11
4. RS485 MODBUS Communication......................................................................................... 12
5. Complementary information .............................................................................................. 14
5.1 Force sensor types................................................................................................................. 14
5.2 Sensor measuring range........................................................................................................ 14
6. Technical parameters ......................................................................................................... 15
Thank you for selecting our product!
This instruction will help you at correct service and accurate exploitation of described device.
Information included in this instruction were prepared with high attention by our specialists and is description of the
product. Based on the information should not be inferred a certain features or suitability for a particular application. This
information does not release the user from the obligation of own judgment and verification. P.P.H. WObit E.K.J. Ober s.c.
reserves the right to make changes without prior notice.
Please read instructions below carefully and adhere to its recommendation
Please pay special attention to the following characters:
CAUTION!
Not adhere to instruction can cause damage or impede the use of hardware or software.

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1.Safety and assembly rules
1.1. Safety rules
•Prior to first start-up of the device carefully read the manual.
•Prior to first start-up of the device make sure all cables are properly connected.
•Provide appropriate working conditions, in compliance with the device
specifications (e.g.: power supply voltage, temperature, maximum current
consumption).
•Prior to any modifications of cables connections, disconnect power supply voltage.
Usage of described device in special meaning systems (e.g.: medical applications, vehicles,
etc.) requires use of additional safety measures against operational errors.
This device can’t be used in open space. It can cause an electric shock and shorten lifetime of
the device.
•Exceeding of recommended operational parameters can lead to damage of the device or to
fire.
Dismantling of the indicator housing during guarantee agreement period results in its
invalidation.
1.2. Assembly recommendation
In the environments of unknown levels of interruptions it is recommended to use the following
means preventing against possible interruptions of the device operation:
Ground or zero the metal rails on which instruments are mounted,
•Do not power the device from the same lines as high power devices without appropriate
network filters.
•Apply power supply, sensor and signal cables screening while screen grounding should be
connected only on one side as close to the device as possible.
For power supply of the motor please use twister pair of cables, if possible equipped with
filters in the form of ferrite beads.
•Avoid routing control (signal) cables in parallel with or in close vicinity of power and supply
cables.
•Avoid close vicinity of devices generating high level of electromagnetic and/or pulse
interference (high power loads, loads with phase or group power regulation).

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2.Device description
2.1 Intended use and properties
ADT42 is a multipurpose 4-channel measuring module for load cells. It enables very precise
measurement with resolution up to 100.000 of measuring range.
ADT42 has multipurpose usage as well at industry as in laboratory, where averaged or precise force
(weight) measurement is necessary. Depends on used sensor there is a possibility of measurement of
small masses in range as well small weights (grams) as large loads (tons). Due to possibility of
aggregate of measurements from selected channels the module can be used in multi-sensor weight
systems.
ADT42 has 2 transistor outputs, and 2 insulated inputs (one tare input). Built-in operating modes
enable the device to be used for dosing without any additional controllers. Measured values can be
converted into analogue signal in 0-10V (ADT42-U version) or (0)4-20mA standard (ADT42-I version).
Access to device is also possible through RS485 bus in MODBUS-RTU protocol, which allows direct
communication one or several modules simultaneously with PLC drivers or HMI panels.
Device configuration can be made also by USB connector ADT42-PC program. This program except
device settings enables preview of current measurement values, saving them to a file and to show
data on a graph.

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Example of application with ADT42 module (silo weight measurement, weight platform)
2.2 Features
Signal measurement from four load cells
Result conversion into force in N or weight in g, kg, T, f
Read out of each channel separately or aggregate of all channels
Measurement filtering function
0-10V (ADT42-U) / (0)4-20mA (ADT42-I) output with calibration function
2 opt insulated inputs (general-purpose and tare)
2 transistor outputs with configurable thresholds
RS485 interface for communication with other devices in MODBUS-RTU protocol
USB connector for transducer configuration and measurement data acquisition
2.3 Description of connectors and diodes
Picture. 1 Connector and panel description
Nr
Description
Analog output 0-10V/ 4-20mA
1
GND
Ground of analog output
2
AOUT
0-10V / 4-20mA output
Opt insulated inputs
3
IN1
Input 1 (TARA)
4
IN2
Input 2 (M-TARA on/off, record)
5
COM
Ground of opt insulated input
RS485 MODBUS-RTU
6
A
Signal +
7
B
Signal -
Transistor output
8
OUT1
Transistor output 1, max. 0,5A
9
OUT2
Transistor output 2, max. 0,5A
10
GND
Ground of outputs
Power supply
11
VDC+
Power supply 12-24 VDC
12
GND
Ground of power supply
Load cells inputs
13, 17, 21, 25
E+
Sensor power supply +
14, 18, 22, 26
S+
Sensor signal +
15, 19, 23, 27
S-
Sensor signal -
16, 20, 24, 28
E-
Sensor power supply -
Signaling diode description
PWR –Module power supply signaling
COM - RS485 / USB communication signaling
TARA - IN1 input state (TARA)
OUT1/2 - ½ output state

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2.4 Power supply
ADT42 module can be powered by voltage in range 12 - 24 VDC (max. 36 VDC). Current consumption
is max. 150mA (for connected 4 force sensors). While using transistor outputs you should add current
consumed on this outputs (max. 0,5A / output).
2.5 Force sensors connection
ADT42 module can cooperate with any force sensor which has bridge with resistance bigger than
150Ω. Sensor(s) should connect according to scheme below.
Picture. 2 Connection of force sensors.
CAUTION!
Sensor wires usually have additional shielded braid, which is connected with metal housing of the
sensor. This signal can be connected to supply ground of ADT42, but we don’t recommend to do
that, while sensor is mounted to metal construction, which can be in different potential.
CAUTION!
Do not short-circuit derivation cables of sensor power supply (E+,E-), and also do not short-circuit
E+ output to other derivation, it can cause damage of the device.
Sensor model
Signals
K200, K300, K500,
KB52, KB82, KMB19,
KMB25, KMB31
K701, K801,
K1101, K1506
K1401, K1501,
K1600
KMM20, KMM30, KMM40,
KMM50, KMM60, K1505,
EMS70, EMS150, EMS200
Power supply +
(V+)
Red
Brown
Red
White
Power supply -
(V-)
Black
Yellow
Black
Brown
Signal + (S+)
Green
Green
Brown
Yellow
Signal - (S-)
White
White
Yellow
Green

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Tab. 1 Wires color description for sensors from WObit’s offer. CAUTION it is possible, that colors of signals can
change.
2.6 Insulated inputs
ADT42 has two opt insulated inputs. They’re activate after giving a voltage 5..24 VDC (minimum 3 V),
between input and their common terminal COM by at minimum 10 ms. To keep input inactive,
voltage shouldn’t exceed 1 V.
Input
Description
IN1
Tare of aggregate value of measurement. It takes as long time as on input IN1 is high
state.
IN1 = 0 -> tare inactive
IN1 = 1 -> tare active
IN2
Switching between value with tare and value without tare.
IN2 = 0 -> output signal = aggregate signal after tare
IN2 = 1 -> output signal = aggregate signal before tare
Tab. 2 Functions of opt insulated inputs.
Picture. 3 Opt insulated input
2.7 Transistor outputs
ADT42 has two transistor outputs PNP type, each with load up to 0.5 A. Their thresholds and
operations ranges can be freely configured (by ADT42-PC program). For example output can be
configured in that way, that it turns on after exceeding set value or when it will be between two
values.
Picture. 4 Transistor outputs
CAUTION!
Circuit is assure by polymer fuse. Exceeding of admissible current on some of outputs will cause
turn off of both outputs.
2.8 Analog output 0-10V/4-20mA
Analog output can be configured for converting of measured force (weight) into voltage in range 0 -
10 V (for ADT42-U version) or current 0(4) –20 mA (for ADT42-I version).

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3.Transducer configuration
3.1 Connection by USB
USB connector is used for communication with ADT42-PC program which is used for device
configuration and measurement data acquisition. After connecting to PC and starting ADT42-PC
program there should appear information about connection with ADT42. Installation of USB port
drivers isn’t required.
CAUTION
1) USB connection should be established always before turning on of driver power
supply.
2) Connection through USB is susceptible to interferences in supply network and to
electromagnetic interferences, which occurs in industry conditions. While occurring
problems with communication the module with ADT42-PC program, you should use
additional protection elements like:
Power line filter before feeder, which supplies the module,
Good quality USB cable with length < 1,5 m, equipped with ferrite beads,
Opt insulated USB HUBs on PC side.
In some conditions can occur, that communication won’t be possible or measurement data
acquisition won’t be correct.
3.2 Configuration of strain gauge inputs and measurements
After activation of ADT42-PC application you should open Settings tab, and then to Sensor
inputs tab.
1) It allows to define number of active inputs. For
example at operations with two force sensors you
should choose 1 + 2. Values from selected channel are
available as independent measurements and as their
aggregate. Results are presented in „Measurements”
tab.
2) Filtration options allows to decrease or to eliminate
fluctuations to achieve the highest measurement
stability.
3) Parameter settings of force sensors: bridge constant
[mV/V] and bridge range [N]. It allows also zeroing of
selected channel.
4) It cause zeroing of total measured value. It is
equivalent with giving signal on IN1(TARA) input.
5) Options of measurement units and displaying

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precision of measurement values (number of
decimals).
6) Reading and recording of introduced parameters to
module, factory settings recall.
Input configuration for force sensors boils down to determine number of used channels (1) and
setting of parameters used for force sensors (3).
Parameters setting of connected force sensors
For force sensor should be introduced parameters as below:
Sensor range [N] –rated load of used sensor in N, usually present on sensor’s housing.
Bridge constant [mV/V] –sensitivity of used sensor in mV/V, usually present on sensor’s housing or
in its documentation. As a rule it is value from a range 1…2 mV/V.
Additionally for each input channel you can reverse measured signal (change sign from + for -) using
option „Reverse the sign” and zeroing channel by pressing „Zero” .
Filtration of measurement
ADT42 has constant averaging filter set in range 0…99 samples and measurement mode „Fast” and
„Slow” (2).
Bigger value of filtration increases stability of measurements, but also causes slower response for
change of signals from sensor. Additionally setting of „slow”mode decreases measurement
frequency 8 times, but it improve its stability.
Picture. 5 Filtration influence on value of measurement.
Units of measurements
Units of measurements (5) determines in which units the module will present measurements (N –
Newton’s, g- gram, kg –kilogram, T –ton, F- pound). Also values available by MODBUS interface are
stored in set units. „Precision” tab set quantity of decimals indicated values in ADT42-PC program
and doesn’t influence on real accuracy of measurement.
3.2.1 Example of configuration
Example: Two force sensors 1,5mV/V, with measuring range up to 500N.
1) Setting of active inputs on „1 + 2”(1)

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2) Introducing value 500 (3) in „Rated capacity”window for sensors 1 and 2
3) Introducing value 1,5 (3) in „Rated output” window for sensors 1 and 2
4) Zeroing of sensor’s offset –button for each channel independently or for all channel
simultaneously(3)
5) Saving of settings to device –„Save” button (6)
For multivariant measurements we recommend to set filtration on „Slow” and select filtration level
to achieve compromise between measurement stability and response time on change of force. (2).
Each value change should be saved by „Save”button (6)
3.3 Configuration of output and RS485
After starting ADT42-PC application go to Settings tab, then to Outputs, RS485 tab.
1) Setting of analog output. A –selection of signal
source, sent on 0-10V/4-20mA output, B –
calibration of analog output
2) Setting of transistor outputs OUT 1 and OUT2.
3) Setting of communication parameters RS485
MODBUS
4) Reading and saving set parameters to module
and factory settings recall
3.3.1 Configuration of analog output
This options allows to determine:
Output type: 0-10V, 0-20mA or 4-20mA
Controlling value (A), which will be transferred to analog output. As controlling value you
can select one of 4 channels or aggregate of active channels.
Calibration of input value (B) in relation to controlling signal.
Depend on module version it will be allowable proper analog output:
ADT42-U –module with voltage output –allowable selection 0-10V
ADT42-I –module with current output –allowable selection 0-10mA or 4-20mA
Example 1: For aggregate value in range of 0-2000 analog output can change in range from 4mA up
to 20mA
1) Setting of output mode for 4-20mA