WOBIT WDT11 User manual

P.P.H. WObit E. J. Ober s.c.
62-045 Pniewy, Dęborzyce 16
tel. [phone], fax. [phone]
e-mail: [email protected]
www.wobit.com.pl
Operation manual
WDT11
Programmable amplifier for force sensors
with 0-10V/4-20mA output, USB and RS485 MODBUS

WDT11 –operation manual - 11-09-2019 www.wobit.com.pl
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Translation of WDT11 operation manual
Version 2.1.2. / 12.09.2019
© P.P.H. WObit E.K.J. Ober s.c., 2019
P.P.H. WObit E. J. Ober s.c.
Dęborzyce 16
62-045 Pniewy
Polska
tel. [phone]
fax. [phone]
[email protected]l
www.wobit.com.pl
Thank you for selecting our product!
This operation manual will facilitate correct operation of the device.
The information contained in this manual was prepared with utmost care by our specialists, and it serve only as the product
description. Based on the presented information, no conclusions should be drawn with regard to any specific features of the
product or its fitness for a particular purpose.
The information does not release the user from the obligation to assess the product individuality and to test its properties and
apply OSH principles. We reserve the right to change the product parameters without notice.
Please read this operation manual carefully and apply to its recommendations.
CAUTION
Any other form of use the device inconsistent with this manual is forbidden.
NOTE
For optimal and safe utilize the machine please read this operation manual carefully and
keep it for future reference.

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Table of contents
1. Safety and assembly rules........................................................................................................................4
1.1. Safety rules......................................................................................................................................4
1.2. Mounting recommendations..........................................................................................................4
2. Device description ...................................................................................................................................5
2.1 Intended use ...................................................................................................................................5
2.2 Description of connectors and diodes ............................................................................................6
2.3 Force sensor connection.................................................................................................................7
2.4 Tara input / tara button ..................................................................................................................7
2.5 Analog output 4-20 mA/0-10 V.......................................................................................................8
3. Device configuration................................................................................................................................9
3.1 Connection via USB.........................................................................................................................9
3.2 Force sensor configuration .............................................................................................................9
3.3 Configuration of 4-20 mA / 0-10 V output................................................................................10
3.4 RS485 MODBUS configuration ..................................................................................................11
4. RS485 MODBUS communication ............................................................................................................ 11
5. Complementary information.................................................................................................................. 13
5.1 Force sensor types ........................................................................................................................13
5.2 Sensor measuring range ...............................................................................................................13
6. Technical parameters............................................................................................................................. 14
7. Safety.................................................................................................................................................... 15
7.1. Packaging, transportation and storage ............................................................................................15
7.2. Device environmental requirements................................................................................................15
7.3. Disposal.............................................................................................................................................15
7.4. Safety principles................................................................................................................................15
8. Declaration of conformity ...................................................................................................................... 17

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1.Safety and assembly rules
1.1. Safety rules
Before the first use of the device please read this operation manual carefully and keep it for future
reference.
Basic instructions enabling safe operation can be found in this document.
While using the device please apply general OSH principles for operation at industrial environment.
Prior to first start-up of the device please make sure that all wires are correctly connected.
Appropriate working conditions should be provided, in compliance with the device specification
(e.g.: voltage supply, temperature, max. current consumption).
Prior to any modifications of cables connections disconnect power supply.
Usage of described device in special meaning systems (e.g. medical applications, vehicles, etc.) require 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.
Protect the device from being penetrated by liquids or foreign bodies –can cause electric shock and/or
damage of the device.
Exceeding of recommended operational parameters can lead to damage of the device or to a fire.
The device was designed and manufactured in a way that ensures its compliance with the principles of
hazard prevention provided that the device is used in accordance with its intended use and properly
maintained.
It is forbidden any remanufacturing and modification of the device without manufacturer’s permission. All
non-authorized modification may cause electric shock or fire. It also results in invalid of the warranty.
The device has warranty for 12 months. The warranty excludes mechanical and electrical damage resulting
from over voltage surges, short circuits or faults and failures caused by incorrect operation by Buyer/ User.
While submitting product complain it is necessary to apply complain regulations available on
Manufacturer’s website: http://www.wobit.com.pl/download/regulamin-reklamacji-www20141225.pdf.
1.2. Mounting recommendations
In environments of unknown level 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 line 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.
Avoid leading of control (signal) cables parallel or in close to power line 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
The subject of this manual is WDT11- programmable amplifier for force sensors, manufactured by:
The WDT11 amplifier is designed for operation with load cells (4 or 6 wires without build-in electronics). It enables
processing of sensor signals into current signal 4-20mA (or voltage signal 0-10 V) and digital (RS485).
Build-in RS485 interface with MODBUS protocol allows direct communication one or several modules with PLC or
HMI. It is possible to connect up to 32 modules on single bus.
Module configuration is made via USB connector and special software, which allows preview of measuring values
and device settings.
Features:
Signal measurement from any load cell (4 or 6 wire)
Result conversion into selected units
Configurable sampling frequency (up to 120 /sec) and signal filtering
Analog output (0)4-20 mA (or 0-10 V)
RS485 interface with MODBUS protocol
The USB connector for device configuration
Build-in button and external connector for tara
Operation status signalization via LED diodes
Device power supply 12-24 VDC
Mounting on DIN rail or by handles
P.P.H. WObit E. J. Ober s.c.
62-045 Pniewy, Dęborzyce 16
tel. [phone], fax. [phone]
e-mail: [e-mail]
www.wobit.com.pl

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Fig. 1 The WDT11 connection possibilities.
2.2 Description of connectors and diodes
Fig. 2 Panel and connectors description.
No
Description
Power supply
1
+
Power supply 12 -24 VDC
2
-
Power supply ground (GND)
RS485 MODBUS-RTU
3
A
Signal +
4
B
Signal -
Analog output, tara input
5
GND
Signal’s ground (incl. power supply)
6
0-10V/4-20mA
Analog output 4-20mA / 0-10V
7
TARA
Tara input
Sensor input
8
SH
9
E-
Sensor power supply - (Excitation-)
10
S-
Sensing voltage - (Sense-)
11
IN-
Sensor signal - (Signal-)
12
IN+
Sensor signal + (Signal+)
13
S+
Sensing voltage + (Sense+)
14
E+
Sensor power supply + (Excitation+)
Signaling diodes description
POWER –Power supply signaling
ERROR –error signaling / exceeding range:
Off –no errors
On –device error
Blinks –no sensor connection / allowable load exceeded ( > 150% sensor
range)
COM –Signaling of RS485 / USB communication
Blinks while RS485 communication

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2.3 Force sensor connection
The WDT11 module can cooperate with any force sensor which has bridge with resistance bigger than 150Ω. Sensor
should be connect according to scheme below.
Fig. 3 Load cell connection with 4-wire and 6-wire.
To connect 4-wire sensor please clench E+ with S+ and E- with S-. Sensor cable shield should be connected to 8
terminal of WDT11.
CAUTION!
Do not clench derivation cables of sensor power supply (E+, E-) it can cause damage of the device.
Sensor type
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
Power supply + (S+)
Green
Green
Brown
Yellow
Signal - (S-)
White
White
Yellow
Green
Table. 1 Wires color description for sensors from WObit’s offer. CAUTION –it is possible that colors of signals may change.
2.4 Tara input / tara button
WDT1 is equipped with TARA input which tare measurement after giving voltage in range 5..24VDC (regarding to
GND) during min 100 ms. To make input non active voltage should be bigger than 1 V.

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Moreover on device panel is button which fulfil the same function.
Fig. 4 Exemplary connection of external TARA input.
2.5 Analog output 4-20 mA/0-10 V
WDT11 depend on version is equipped with current output (4-20mA) or voltage output 0-10 V which process force
value into proper current/voltage value. Output analog value can be calculated to measured force according to
settings.
In case of module with output 4-20 mA it is possible additional signaling of device operating status:
Current value
Description
3 mA
Sensor overload (value > 1.5 x sensor range) / sensor connection error
3,9 … 4 mA
Measurement value below range
4 … 20 mA
Measurement within range
20 … 24 mA
Measurement above range (> sensor range < 1.5 sensor range)
Fig. 5Analog output (4-20 mA/0-10 V).

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3.Device configuration
3.1 Connection via USB
USB connector is used for communication with WDT11-PC program. After connecting to PC and starting WDT11-PC
program there should appear information about connection. Installation of USB port drivers isn’t required. In case
While no connection please disconnect USB wait and try to reconnect.
CAUTION!
1) USB connection should be established always before turning on driver power supply.
2) USB connection is susceptible to interferences in supply network and to electromagnetic
interferences which occurs in industrial conditions. While occurring problems with communication
please additional protection elements like:
Power line filter,
Good quality USB with length < 1,5m equipped with ferrite beads
Opt insulated USB HUBs on PC side
At higher noises can occur that communication won’t be possible.
There are known problems with USB 3.0 port compatibility (blue socket) in Windows 7 while communication
with USB HID devices. In case of communication problems please connect the driver to USB 2.0 port.
3.2 Force sensor configuration
Units: it defines units of measured value.
Filtration level: it defines of constant averaging filter (quantity
of further measurements which will be averaged).
Measurement frequency: it defines number of measurements
made by transducer in 1 second.
Offset: it allows to set initial value for sensor.
Reverse sign: it reverse sign of measured value.
Sensor parameters:
Sensor constant [mV/V] and sensor capacity[N] –please enter
values from sensor data/sensor housing.
Setting parameters of force sensor
For force sensor please enter following parameters:
Sensor capacity [N] –rated load of used sensor in N usually presented on sensor housing.
Rated output [mV/V] –sensitivity of used sensor in mV/V usually presented on sensor housing or in its
documentation. At standard is value within range 1…2mV/V.
Measurement filtration
WDT11 is equipped with constant averaging filter within range 0…99 samples. Bigger filtration value increases
measurements stability but cause slower response on sensor signal change.

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Fig. 6 Filtration influence on measurement value.
Measurement stability depend also on set measuring frequency. The most stabile measurement are obtained at
high filtration value and low measuring frequency, but reaction to force change is the slowest.
Device response time [ms] = (Filtration level + 1) x 1000/Measurement frequency
Example:
Filtration level = 4, Frequency = 50/sec.
Device response time = (4 + 1) x 1000/50 = 100 ms.
WDT11 will present complete value of measured force after 100ms since it starts.
3.3 Configuration of 4-20 mA / 0-10 V output
Depend on device version is available current 4-20 mA or voltage 0-10 V signal which can be freely calibrated
regarding to measured force value.
Mode: it present version of device analog output.
Output = 4 mA (0V) for value: measured force value for which
on output will appear 4 mA (0V).
Output = 20 mA (10V) for value: measured force value for
which on output will appear 20 mA (10V).
Total value: when marked, no matter tension or compression,
analog output will generate the same value.
Example 1:
For force value within range from 0 up to 2000 analog output should change within range from 4 mA up to 20mA
(force rise -> analog signal rise)
1) Setting Output = 4mA for value: 0
2) Setting Output = 20mA for value: 2000
3) Value saving using button Save
Example 2:
For force value within range from 200 up to 300 analog output should change within range from 4 mA up to 20mA
(force rise -> analog signal rise)
1) Setting Output = 4 mA for value: 200
2) Setting Output = 20mA for value: 300

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3) Setting saving using button Save
Example 2:
For force value within range 0 up to 500 analog output should change within range 20 mA do 4 mA
(force rises -> analog signal fall off)
4) Setting Output = 4mA for value: 500
5) Setting Output = 20mA for value: 0
6) Setting saving using button Save
3.4 RS485 MODBUS configuration
Device address: it defines slave number of WDT11 in Modbus
network. Value within range 1-247.
Baud rate: please set the same as in Modbus Master device
Parity : please set the same as in Modbus Master device
4.RS485 MODBUS communication
RS485 can be used for communication with PLC, HMI or other device using MODBUS-RTU protocol. The RS485
terminal at WDT11 isn’t galvanically insulated so please provide the same ground electric potential for WDT11 and
master device (common GND signal).
Default baudrate parameters:
Baudrate: 38400bps, bits: 8, stop bit: 1, parity: none
Slave address: 1
Transmission speed and WDT11 address can be changed using WDT11-PC program.
Used MODBUS functions
Function no. (hex)
Description
2 (0x02)
Read input state / status
3 (0x03)
Read X registers
5 (0x05)
Record of single bit
6 (0x06)
Record of single bit
16 (0x10)
Record of N registers(for REAL numbers)

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Registers map (firmware v1.01)
Address
Name
Variable
type
Mode (Modbus
function)
Description
Values stored in INT type registers (integer number)
0
TENS_ACT_INT
DINT
R (0x03)
Current force value
2
TENS_MIN_INT
DINT
R (0x03)
Registered minimal force value
4
TENS_MAX_INT
DINT
R (0x03)
Registered maximal force value
6
TENS_RAW_INT
DINT
R (0x03)
Current force value without units conversion
8
TENS_SENSE_INT
DINT
R (0x03) / W(0x10)
„Rated output” in mV/V * 1000
10
TENS_RANGE_INT
DINT
R (0x03) / W(0x10)
„Capacity” parameter in N
12
TENS_RATE_INT
INT
R (0x03) / W(0x06)
Sampling frequency: 0-0, 1-10Hz, 2-33Hz, 3-50Hz, 4-
66Hz,5-123Hz
13
ANALOG_INT
INT
R (0x03)
Analog output value in mA/mV *1000
Values stored in REAL type registers (floating point number)
20
TENS_ACT_REAL
REAL
R (0x03)
Current force value
22
TENS_MIN_REAL
REAL
R (0x03)
Registered minimal force value
24
TENS_MAX_REAL
REAL
R (0x03)
Registered maximal force value
26
ANALOG_REAL
REAL
R (0x03)
Analog output value in mA/mV
28
TENS_SENSE_REAL
REAL
R (0x03) / W(0x10)
„Rated output” parameter in mV/V
Single bit values
4000
TARA
W (0x05)
Tara
4001
MIN_MAX_RESET
W (0x05)
Reset of min/max force value
5000
INPUT_TARA
R(0x02)
Read tara input status
5001
TENS_RANGE_ERR
R(0x02)
Sensor connection error / exceeding range
5002
TENS_ADC_ERR
R(0x02)
Transducer error
R –read register, W - record
CAUTION: 4-byte number REAL type is contained in two registers. The first register contains younger part of the number, the second –its
older part. In order to read REAL number value correctly, read two registers (X, X+1), and then conduct appropriate conversion.
Conversion of 2 registers (4 Byte) into 32 Bit number (REAL)
Register HI
Register LO
Register_X+1 HI
Register_X+1 LO
<-> Byte1
<-> Byte0
<-> Byte3
<-> Byte2
Number_32_bit = Byte3<<24 + Byte2<<16 + Byte1<<8 + Byte0, or Number_32_bit = Register_2 + Register_3<<16
Example of MODBUS communication table
Reading of measurements from ACT_INT register (Function: 03, Register address: 0)
Request (MODBUS MASTER -> ADT42)
Response (ADT42-> MODBUS MASTER)
Device address
0x01
Device address
0x01
Function
0x03
Function
0x03
Hi register address
0x00
Number of bytes
0x04
Lo register address
0x00
Register 0x02 Hi
DINT (Byte 1)
Number of Hi registers
0x00
Register 0x02 Lo
DINT (Byte 0)
Number of Lo registers
0x02
Register 0x03 Hi
DINT (Byte 3)
CRC Hi
0xC4
Register 0x03 Lo
DINT (Byte 2)
CRC Lo
0x0B
CRC Hi
8 bit
CRC Lo
8 bit
Tare –bit setting of TARA register (Function: 05, Register address: 4000)
Request (MODBUS MASTER -> ADT42)
Response (ADT42) -> MODBUS MASTER)
Device address
0x01
Device address
0x01
Function
0x05
Function
0x05
Hi registry address
0x0F
Hi registry address
0x0F
Lo registry address
0xA0
Lo registry address
0xA0
Register 0x00 Hi
0xFF
Register 0x00 Hi
0xFF
Register 0x00 Lo
0x00
Register 0x00 Lo
0x00
CRC HI
0x8F
CRC Hi
8 bit
CRC LO
0x0C
CRC Lo
8 bit

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5.Complementary information
5.1 Force sensor types
WObit company has a broad offer of force sensors within range from single Newton’s up to hundreds of kilo
Newton’s. Depend on assembly and way of measuring force (tension, compression) are available sensors with
different shapes (table below).
Beam
For measuring tension force. Range of measured force 0..350 N.
Models example: K200, K300
S-beam
For measuring large tension force. Range of measured force 0..75 kN.
Models example: K1401, K1501, K1505, K1506, K1600
Round
For measuring small and large tension force. Range of measured force 0..100 kN.
Przykładowe modele: KB52, KB82, KMB19, KMB25, KMB31, KMM30, KMM50,
KMM60,
Round with
shaft
For measuring small and large tension and compression force. Range of
measured force 0..50 kN.
Models example: KMM20, KMM40
Cylindrical
For measuring small and large tension and compression force. Range of
measured force 0..200kN.
Models example: K1101
5.2 Sensor measuring range
Rated load for sensor is a level of force which specifies top value of
measuring range (value given for sensor as bridge range (F) in N).
Applied load is the biggest force which have unambiguous connection
between force and output signal (signal value is changing linear in relation
to force). Max 150% sensor range (bridge).
Cut-off load is the biggest force which can take each sensor without it
damage. It can count max. 200% sensor range.
Destroying load means force applied to sensor shaft which exceeding can
lead to mechanical damage of the sensor.
CAUTION
Values above concerns only axial forces applied to the sensor. Range of forces applied non axial (a tangle to
sensor measuring axis) is smaller.
Destroying load
>200% F
Cut-off load
+200% F
Applied load
+150% F
Rated load
+100% F
Measuring range
Zero load
0 [N]
Rated load
-100% F
Applied load
-150% F
Cut-off load
-200% F
Destroying load
<200% F

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Constant of e.g. KMM60 sensor is 1,5mV/V 2%. Error of the sensor is specified by following values: tolerance of linearity 0,2%
of measuring range, zero tolerance 2% of measuring range, hysteresis 0,2% of measuring range and creep measured in time of
30 minutes 0,1%. Temperature factor of zero point and constant is 0,1% of range /10oC. Input resistance of bridge is 380 Ω
±10%, and output resistance is 350Ω ±5%.
6.Technical parameters
Mechanical parameters
Housing dimensions:
40 x 86 x 50,4 mm
Weight: approx.
100 g
Temperature operating range
5..50°C
Protection degree
IP20
Mounting
Handle for DIN rail
WDT11-I - module with current output (0)4-20 mA
WDT11-U –module with voltage output 0-10 V
Electrical parameters
Power supply
12…24 VDC, < 50mA
Force sensors inputs
Sensor’s power supply: 5V (also 10 V sensors)
Max. differential voltage: ±39 mV,
Resolution: 16 bit (0,003% FS - for typical bridge with sensitivity 2 mV/V)
Temperature error: 0,0025%/C°
Measurement frequency : max. 123 Hz (4, 10, 33, 50, 62, 123)
Time of initial annealing: approx. 10 min
Analog output 0-10 V
(WDT11-U version)
Mode: 0-10 V :
V min = 0,02 V, V max = 10 V, max. load 20 mA
Resolution: ±2mV, Accuracy 1 0mV (0,1% FS)
Analog output 0/4-20 mA
(WDT11-I version)
Mode: (0)4-20 mA :
I min = 3mA (sensor error) , max = 24 mA (exceeding range)
Resolution: ±0,008 mA, accuracy 0,05mA (0,1% FS)
TARA input
Low state: 0V (max. 1 V), High state: +24 V (5…24 V)
Min. Pulse length >100 ms,
Communication
RS485 MODBUS-RTU, (default 38400 bps, 8:n:1, address: 1)
USB: 1.1, 2.0
Operating temperature range
5..50o C
Protection degree
IP20

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7.Safety
7.1. Packaging, transportation and storage
WDT11 is delivered to the user in mounted condition. The manufacturer provides proper package of the device for
its transportation. Kind of the package and its durability is suited to way of transport, distance and other factors
influencing on transport danger risk.
Storage of WDT11 doesn’t required any specific conditions except proper storage environment. Place for WDT11
storage must provide proper protection against atmospheric conditions. It should be dry, with humidity below 70%
and temperature in range 5-50°C. It is recommended to store the device in package it was delivered. To provide
proper protection against humidity it is recommended to store the device on pallets or other isolating elements,
not directly on the ground. Please protect the device against mechanical damages.
Before mounting the WDT11 it is necessary to unpack it. While unpacking please be careful to not to damage the
device. After unpacking the device please make sure it was not damaged during transport.
Before mounting the device please read this operation manual carefully and familiarize yourself with technical
drawings.
NOTE
Before starting mounting/disassembly the device please make sure it is disconnected from
power supply source.
Mounting/disassembly of the device can be executed only by trained and experienced staff. They need to read this
manual carefully and have finished OSH training.
7.2. Device environmental requirements
The device is not intendent to use at potential explosive atmosphere. It is not recommended to use the device at
atmosphere with high dust and in presence of noxious vapor.
The WDT11 temperature operating range is within 5-50°C and air humidity should be below 70%.
While selection of the machine workspace illumination please apply requirements of law principles and regulations.
To provide proper illumination except its necessary strength it is important to meet basic human needs such as
vision comfort, visual performance and safety. The illumination should be fitted to way of use the device.
7.3. Disposal
The device design and high quality elements provide long-time operation of the device(depend on environment
conditions and way of use of the device). However changing customer’ requirements, changing law principles and
technology development may cause necessary of altering of the device or its disposal. It concerns also repaired or
exchanged machine parts. The buyer is obligated to dispose the device or its parts in accordance with the applicable
national laws, regulations and requirements.
All device parts can be recycled. Device disposal should be maintained by specialized companies.
7.4. Safety principles
For safe and optimal WDT11 utilization please carefully read, understood and follow all information and warning
signs placed on the device and/or this manual.

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NOTE
Mounting/disassembly and utilization of the device can be operated by trained Staff in
range of device utilization and OSH principles.
NOTE
It is recommended to use the device in industrial environment.
NOTE
Not applying to this document may lead to health and life danger.
NOTE
Use the device inconsistently to recommendations at this manual may lead to its damage
and invalidation the warranty.
NOTE
Please apply technical parameters enclosed in this document.
NOTE
Protect the device from being penetrated by liquids or foreign bodies. There is a risk of
electric shock.
CAUTION
It is forbidden to extinguish any fire in device environment with water. Please use only
special fire-fighting means.
CAUTION
It is forbidden any remanufacturing and modification of the device without manufacturer’s
permission. All non-authorized modification may decrease safety level and/or result in
invalid of the warranty.

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8.Declaration of conformity
EC DECLARATION OF CONFORMITY
No. 01/07/2016
Programmable amplifier for force sensors
P.P.H. WObit E. J. Ober s.c.
Dęborzyce 16, 62-045 Pniewy
tel.: [phone]
fax: [phone]
This declaration of conformity is issued at the sole liability of the manufacturer.
Name:
Programmable amplifier for force
sensors
Type:
WDT11
The object of the declaration described above is in conformity with the relevant European Union
harmonisation legislation:
- 2014/30/EU-DIRECTIVE OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 26 February 2014 on
the harmonisation of the laws of the Member States relating to electromagnetic compatibility replace
2004/108/WE directive,
- PN-EN 61000-6-2:2008 - Electromagnetic Compatibility (EMC) - Durability in industrial environments,
- PN-EN 61000-6-4:2008 - Electromagnetic Compatibility (EMC) - Emission standard in industrial
environments.
Dęborzyce, 12.07.2016 r.
Jacek Ober, Co-owner
(Place and date of issue)
(Name and surname, occupation)