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TB20, strain gauge weighing module | Edition 1 | 21.12.2018   

61 

9

 

Operation of the weighing module 

9.1

 

Data transfer between the PLC and the weighing module 

For the operation of the weighing module behind a TB20 bus coupler, a command must be carried out 
once when starting up in order that the module is ready for operation (e.g. load  
acknowledgment). The master writes data into the outputs and reads data from the inputs of the bus 
coupler. 

9.1.1

 

Setup of the control commands 

Outputs: 7 bytes 

 

7 

6 

5 

4 

3 

2 

1 

0 

OB 0 - 3 

Sampling point value / offset (for example, 10000 transferred as 100.00 kg) 

OB 4 

Reserved 

Reserved 

Load 
sampling 
point 5 

Load 
sampling 
point 4 

Load 
sampling 
point 3 

Load 
sampling 
point 2 

Load 
sampling 
point 1 

Load offset 

OB 5 

Acknowledg
ment for 
"Control 
command 
has been 
carried out" 

Carry out 
wire break 
test 

Output 
sampling 
point 5 

Output 
sampling 
point 4 

Output 
sampling 
point 3 

Output 
sampling 
point 2 

Output 
sampling 
point 1 

Output 
offset 

OB 6 

Reserved 

Reserved 

Reserved 

Reserved 

Reserved 

Reserved 

Reserved 

Reserved 

9.1.2

 

Setup of the response data 

Inputs: 8 bytes 

 

7 

6 

5 

4 

3 

2 

1 

0 

IB 0 - 3  

Return value  
Measurement value of the load cell or saved value (offset/sampling point) 
(Transferred are, for example, 10000 as 100.00 kg or 2345 as 2,345 mV/V depending upon the issuing unit) 

IB 4 

1 = Ready 
for 
operation 

Reserved 

Reserved 

Reserved 

Reserved 

Reserved 

Reserved 

Value valid. 
(=1) 

IB 5 

Control 
command 
was carried 
out (= 1) 

Reserved 

ADC 
overflow or 
underflow 
(=1) 

Fault when 
reading or 
saving a 
sampling 
point/offset 
(=1) 

Reserved 

Line break 
(=1) 

Bridge feed 
voltage is 
too large 
(= 1) 

Bridge feed 
voltage is 
too small 
(=1) 

IB 6 

Reserved 

Reserved 

Reserved 

Reserved 

Reserved 

Reserved 

Reserved 

Reserved 

IB 7 

Reserved 

Reserved 

Reserved 

Reserved 

Reserved 

Reserved 

Reserved 

Reserved 

 

 

 

Содержание TB20

Страница 1: ...KG Hannberger Weg 2 91091 Gro enseebach Germany Phone 49 9135 7380 0 Fax 49 9135 7380 110 info helmholz de www helmholz de TB20 Strain gauge weighing module Manual Version 1 21 12 2018 Manual order no...

Страница 2: ...ning purposes or with the use of electronic systems without written approval from Helmholz GmbH Co KG All rights reserved in the event of the granting of a patent or the registration of a utility mode...

Страница 3: ...ction 10 1 6 5 EMC protection 10 1 6 6 Operation 11 1 6 7 Liability 11 1 6 8 Disclaimer of liability 11 1 6 9 Warranty 11 2 System overview 12 2 1 General 12 2 2 The components of the TB20 I O system...

Страница 4: ...36 4 8 Electronic nameplate 36 4 9 Fusing 36 5 TB20 strain gauge weighing module 37 5 1 Purpose 37 5 2 Measurement values 37 5 2 1 Measurement value for conversion rate 37 5 2 2 Averaging 37 5 2 3 Pe...

Страница 5: ...r between the PLC and the weighing module 61 9 1 1 Setup of the control commands 61 9 1 2 Setup of the response data 61 9 1 3 Diagnostic messages 62 9 2 Set and read out the offset sampling point valu...

Страница 6: ...o PTB 76 10 12 Minimum measurement range of rated load 76 10 13 Parallel connection of load cells 76 10 14 Measurement errors 76 10 15 Weighing technology terms 78 11 Technical data 79 11 1 Certificat...

Страница 7: ...al Configuration execution and operating errors can interfere with the proper operation of the TB20 devices and result in personal injury as well as material or environmental damage Only suitably qual...

Страница 8: ...e and health of people from electrical voltage If the hazard warning is ignored there is a probable danger to life and health of people from electrical voltage If the hazard warning is ignored people...

Страница 9: ...s the only means for preventing hazardous situations on machinery and equipment Successful and safe operation of the TB20 devices requires proper transport storage installation assembly installation c...

Страница 10: ...k on the TB20 devices 1 6 3 Protection against electrostatic discharges To prevent damage through electrostatic discharges the following safety measures are to be followed during assembly and service...

Страница 11: ...ions must also be observed in any case 1 6 8 Disclaimer of liability Helmholz GmbH Co KG is not liable for damages if these were caused by use or application of products that was improper or not as in...

Страница 12: ...protection rating of IP20 2 2 The components of the TB20 I O system 2 2 1 Bus coupler The system s bus coupler includes a bus interface and a power module The bus interface is responsible for establi...

Страница 13: ...ottom These voltages are passed from module to module through the base modules Power and isolation modules make it possible to segment the power supply for external signals into individual power suppl...

Страница 14: ...nto individual power supply sections that are powered separately Power modules deliver all necessary power to the peripheral modules connected after them and if applicable all the way to the next powe...

Страница 15: ...2 5 Final cover The final cover protects the contacts on the last base module from accidental contact by covering its outer right hand side 2 2 6 Components in a module Each module consists of three...

Страница 16: ...and a coding socket on the base module see following figure The coding plug and coding socket can each be in one of eight different positions Each of these eight positions is factory assigned to a sp...

Страница 17: ...ure must not exceed 60 C 3 1 Installation position The TB20 I O system can be installed in any position In order to achieve optimum ventilation and be able to use the system at the specified maximum a...

Страница 18: ...e the base module on the DIN rail from below in an inclined position Then push the upper part of the base module towards the rail until the module is parallel to the rail and the rail fastener on the...

Страница 19: ...oval To remove a peripheral module follow the four steps below Step 1 Remove the front connector To remove the front connector push the tab above the front connector upwards see the picture below This...

Страница 20: ...1 21 12 2018 20 Step 2 Remove the electronic module To do so use your middle finger to push on the lever from above and then use your thumb and index finger to pull out the electronic module while hol...

Страница 21: ...e Edition 1 21 12 2018 21 Step 3 Release the base module Use a screwdriver to release the base module Turn the screwdriver 90 counterclockwise to release Step 4 Remove the base module Remove the base...

Страница 22: ...ing used TB20 modules can carry lethal voltage Before starting any work on TB20 system components make sure to de energize all components and the cables supplying them with power During work when the...

Страница 23: ...8 23 Step 2 Remove the electronic module To remove the electronic module use your middle finger to push on the lever from above and then use your thumb and index finger to pull out the electronic modu...

Страница 24: ...Step 3 Plug in a new electronic module The electronic module must be snapped into place on the base module with a single continuous movement If the electronic module is not snapped into place firmly a...

Страница 25: ...the coding elements on the electronic module and base module see figure below match If the coding elements on the electronic module do not match those on the base module you may be attempting to plug...

Страница 26: ...with the attached base module on the DIN rail by moving it straight towards the rail Then push the coupler towards the rail until the base module s rail fastener snaps into place with a soft click St...

Страница 27: ...locking mechanism Release the locking lever on the left side of the coupler in order to disengauge it from the DIN rail Step 2 Remove the coupler Use your middle finger to push on the lever from abov...

Страница 28: ...train gauge weighing module Edition 1 21 12 2018 28 Step 3 Release the base module Use a screwdriver to release the base module Step 4 Remove the base module Remove the base module by pulling it towar...

Страница 29: ...1 Installation Slide the final cover onto the last module along the case starting from the end with the front connector and moving towards the DIN rail until the cover covers the base module s contac...

Страница 30: ...area with good conductivity no paint on paint Where necessary use contact washers or serrated washers The cabinet door must be connected to the ground straps top middle bottom over as short a distance...

Страница 31: ...cross sectional cable area of up to 1 5 mm 16 22 AWG with or without ferrules It is also possible for example to connect two 0 75 mm wires to a single spring type terminal provided the maximum cross s...

Страница 32: ...ector is used to power two buses The power bus used to power the I O components 24 VDC GND AUX The communications bus used to power the electronics in the peripheral modules The AUX pin can be used to...

Страница 33: ...into individual power supply sections that are powered separately The order no for the power and isolation module for 24 V signals is 600 710 0AA01 Its electronic module and base module have the same...

Страница 34: ...2 2018 34 4 5 Separate power supply segments for the coupler and the I O components If the power supply for the coupler needs to be separate from the power supply for the I O modules a power and isola...

Страница 35: ...one is not sufficient that is when there are a large number of modules on the bus The TB20 ToolBox configuration and diagnostics program can be used to calculate the current draw 24 V DC GND and AUX a...

Страница 36: ...eters or diagnostic capabilities 4 8 Electronic nameplate All of a TB20 module s important information can be found on its electronic nameplate This information includes for example the corresponding...

Страница 37: ...uations in the measurement can be suppressed Disruptions from a series of measurement values can be smoothed out using a moving mathematical average A zero point comparison of the load cell can be car...

Страница 38: ...5 2 5 Configuration of the weighing module In order to be able to calculate the weight value from the voltage measurement value the characteristic of the measurement system must be defined The charact...

Страница 39: ...e can be changed by overwriting The offset value raises or lowers the entire characteristic including the set sampling points The offset value must be provided in kg with 2 decimal points A negative o...

Страница 40: ...r of sampling points see chapter 8 Linearization through sampling points Blue line defined by zero point and max quiescent point Green line linearized with sampling points Red line linearized with sam...

Страница 41: ...eshold can be configured for the monitoring of the feed voltage By way of a 2nd measurement channel the bridge feed voltage is determined cyclically with active monitoring and checked for the broachin...

Страница 42: ...5 3 Works parameters The default values for the module parameters are part of the firmware and can t be changed When no parameters are transferred to the module the module uses default values for all...

Страница 43: ...ght The module is idle IDLE module s parameters have not been configured yet Flashing red The module is indicating a parameter assignment error 2 Solid green light Measurement running 3 Solid red ligh...

Страница 44: ...characteristic through configuration of the sampling points Change offset e g for a measurement vessel The offset may only be set for an unladen scale There is no unladen weight function In order to...

Страница 45: ...See chapter 8 for a precise description of the parameters Configuration values Offset Sampling point 1 5 The configuration parameters are transferred from the user program to the weighing module or ar...

Страница 46: ...planning of a system is possible The weighing module is configured via the user program of the bus master PLC when using the following couplers PROFIBUS DP PROFINET IO See chapter Fehler Verweisquell...

Страница 47: ...on the computer under Windows 7 8 8 1 Windows 10 requires no additional USB driver The Helmholz USB driver is contained in the installation file as of TB20 ToolBox version 1 38 It is also possible to...

Страница 48: ...ng on the installed weighing module a comment can be entered and the label prepared The firmware according to the catalog is shown under Advanced When using PROFIBUS or PROFINET configuration is carri...

Страница 49: ...on of a configured TB20 in running operation The diagnostics start after the coupler is clicked The currently active parameter values of the weighing module are displayed when the weighing module is c...

Страница 50: ...sion of the installed module CI version of the installed module App status Operating status of the weighing module Other displays depending upon the bus coupler used In the figure above with the examp...

Страница 51: ...o be considered Measurement errors can occur when the rated load is exceeded Conversion rate samples per second 6 25 7 5 12 5 15 25 30 50 60 Issuing of measurement value mV V kg Values for averaging 1...

Страница 52: ...at the terminals REF REF is greater than the configured max voltage limit No reporting when the voltage monitoring is deactivated Line break display when a line break of the AI sense line is determin...

Страница 53: ...t a user program The TB20 ToolBox must be connected with the coupler via USB and be online when starting the simulation If no appropriate project is saved in the TB20 ToolBox the currently connected c...

Страница 54: ...nitored and a warning is issued when the value ranges are exceeded or fallen short of Changes are marked yellow but do not yet take effect Several changes can be made simultaneously Accepts the entrie...

Страница 55: ...bed in chapter 9 For configuration see chapter 8 6 5 Use the weighing module with STEP7 or TIA The weighing module can be incorporated into the project and configured with a GSD file PROFIBUS or GSDML...

Страница 56: ...c safety instructions Equipment damage due to incorrect wiring Measurements must be carried out in full bridge circuit No voltage may be attached directly to the signal inputs Use load cells in your m...

Страница 57: ...for large temperature fluctuations during the measurement Load cell with 4 conductor connection The supply voltage for the load cell is measured by the weighing module via the supply line With long l...

Страница 58: ...are necessary for a measurement the load cells can be connected parallel The supply voltage for the load cell is measured by the weighing module via the supply line With long lines the voltage drop on...

Страница 59: ...he load cell feed voltage In the case of a 4 conductor connection the sensor lines at the weighing module are connected at the output of the feed voltage A wire break detection is possible for 6 condu...

Страница 60: ...ring number of averages 1 no filtering n 1 n 2 255 Number of sampling points to be used Byte 3 Bit 0 2 Number of sampling points to be used ascending and without gaps 0 Sampling points are not used n...

Страница 61: ...carried out Carry out wire break test Output sampling point 5 Output sampling point 4 Output sampling point 3 Output sampling point 2 Output sampling point 1 Output offset OB 6 Reserved Reserved Rese...

Страница 62: ...alue valid bit is set to invalid as long as the following situation prevails The AD converter switches to overflow A calculation for determining the measurement value switches to overflow One or sever...

Страница 63: ...or the indicated sampling point is accepted and saved in the weighing module The correctness must be verified in the user program by reading back the saved value If an error occurs at some point thro...

Страница 64: ...nly takes place on the AI Sense line Set the bit Carry out wire break test AB 5 Bit 6 When the test has been carried out the bit Control command has been carried out IB 5 Bit 7 is set by the module In...

Страница 65: ...rily changed for test purposes in simulation operation with continuous measuring Mark the module and call up the General window Edit the parameters to be changed in the left window Changed lines and t...

Страница 66: ...sampling point to be set Only one load command may be carried out for offset sampling points 1 No value is transferred when several load commands are carried out at the same time In the right window...

Страница 67: ...ng points in the left window Values in the numerical sequence of ascending values must be assigned to the sampling points Activation only takes place for the duration of the simulation The configured...

Страница 68: ...g point values Offset and sampling point values are saved in non volatile memory in the weighing module The offset and sampling point values can be read out with the help of the TB20 ToolBox In the ri...

Страница 69: ...point 9 3 6 Wire break test A wire break test of the AI Sense line can be carried out with the TB20 Toolbox In the right window Activate Carry out wire break test green display 1 The field turns yello...

Страница 70: ...TB20 strain gauge weighing module Edition 1 21 12 2018 70 Deactivate the Acknowledgment bit for control command again 4 The field turns yellow click in the right window 2...

Страница 71: ...sampling point must be smaller than the rated load of the load cell The total of the offset value and the value of the largest sampling point must be smaller than the rated load of the load cell An of...

Страница 72: ...ltage or 0 must be entered for both values when no monitoring is to take place The voltage range from 0 V to 3 7 V cannot be monitored The entry of voltage values 0 V U 3 7 V result in a configuration...

Страница 73: ...2018 73 The wire break monitoring must be initiated by the program of the master control system see chapter 9 1 The wire break monitoring doesn t take place cyclically and interrupts the continuous me...

Страница 74: ...and cannot be directly measured with an Ohmmeter The Wheatstone bridge connection is used as a measurement connection the voltage change of which is measured with a measurement amplifier in the event...

Страница 75: ...n be recorded and monitored for an external voltage feed of the load cell 10 5 Rated load of the load cell The rated load of the load cell is usually the maximum permitted load for operation In additi...

Страница 76: ...imum measurement range of rated load The minimum measurement range is the minimum measurement range measurement range interval a gaging capable load cell scale must cover The TB20 strain gauge weighin...

Страница 77: ...differing behavior of the load cell under when loading and unloading As a result of the hysteresis the measurement values when loading and unloading can deviate from one another with the same load Te...

Страница 78: ...vice is determined in the unladen condition taring 2 In the case of a presumed linear load characteristic the end point of the load characteristic is adapted as a characteristic value amplification fa...

Страница 79: ...ge feed 5 V 70 mA Ri ca 6 5 Ohm Internal reversible fuse Overvoltage protection Bridge feed output and measurement inputs are protected against 24 V Diagnostics Error response via status bits Power su...

Страница 80: ...TB20 strain gauge weighing module Edition 1 21 12 2018 80 12 TB20 System Dimensions...

Страница 81: ...14 mm standard base module is available in sets of five with order no 600 900 9AA01 13 1 2 25 mm width base module The 25 mm standard base module is available in sets of five with order no 600 900 9AA...

Страница 82: ...0 9CA01 It can be used with the power module 600 700 0AA01 and with all bus couplers 13 2 Front connectors 13 2 1 10 terminal front connector The 10 terminal front connector is available in sets of fi...

Страница 83: ...odules Electronic modules can be ordered as spare parts with the order number of the original product The entire product is always sent including the base module and the front connector 13 4 Final cov...

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