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Summary of Contents for Helmholz TB20
- Page 1 TB20 – Strain gauge weighing module Manual Version 1 / 21.12.2018 Manual order no.: 960-256-7AA01/en Helmholz GmbH & Co. KG | Hannberger Weg 2 | 91091 Großenseebach | Germany Phone +49 9135 7380-0 | Fax +49 9135 7380-110 | info@helmholz.de | www.helmholz.de...
- Page 2 Helmholz GmbH & Co. KG. All rights reserved in the event of the granting of a patent or the registration of a utility model. To download the latest version of this manual, please visit our website at www.helmholz.de. We welcome all ideas and suggestions.
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Page 3: Table Of Contents
Installation and removal ................. 17 Installation position......................... 17 Minimum clearance ........................ 17 Installing and removing peripheral modules ................18 3.3.1 Installation ........................18 3.3.2 Removal ........................... 19 Replacing an electronic module ....................22 TB20, strain gauge weighing module | Edition 1 | 21.12.2018... - Page 4 Setting, saving and displaying values ................41 Works parameters ........................42 Pin assignment ........................43 LEDs of the weighing module ....................43 Commissioning....................44 Initial commissioning of the TB20 strain gauge weighing module ........... 44 TB20, strain gauge weighing module | Edition 1 | 21.12.2018...
- Page 5 9.2.2 Read out offset/sampling points ..................63 9.2.3 Carry out wire break test ....................64 Read out and change offset/sampling point values with the TB20 ToolBox ......65 9.3.1 Setting offset/sampling point values ................66 9.3.2 Activation of the sampling point values ................67 9.3.3...
- Page 6 Power base module ......................82 13.2 Front connectors ......................... 82 13.2.1 10-terminal front connector ..................... 82 13.2.2 20-terminal front connector ..................... 82 13.3 Electronic modules ......................83 13.4 Final cover ........................... 83 TB20, strain gauge weighing module | Edition 1 | 21.12.2018...
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Page 7: General
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... -
Page 8: Note Symbols And Signal Words In The Manual
If the hazard warning is ignored, people can be injured or harmed. Draws attention to sources of error that can damage equipment or the environment. Gives an indication for better understanding or preventing errors. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 9: Intended Use
Communication with a higher-level control system is via a bus system / network and a TB20 bus coupler. Up to 64 modules from the TB20 range can be set up on a bus coupler. The bus couplers support hot plug for replacing modules during ongoing operation. -
Page 10: Installation
Do not touch components and assemblies on contacts. 1.6.4 Overcurrent protection To protect the TB20 and the supply line, a slow-blowing 8 A line protection fuse is required. 1.6.5 EMC protection To ensure electromagnetic compatibility (EMC) in your control cabinets in electrically harsh environments, the known rules of EMC-compliant configuration are to be observed in the design and construction. -
Page 11: Operation
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 intended. -
Page 12: System Overview
2 System overview 2.1 General The TB20 I/O system is an open, modular, and distributed peripheral system designed to be mounted on a 35 mm DIN rail. It is made up of the following components: Bus couplers Peripheral modules ... -
Page 13: Power And Isolation Module
(see section 2.2.4). Power and insulation modules have a lighter body color. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 14: Power Module
The “TB20 ToolBox” configuration program can be used to determine whether power modules are needed, as well as how many of them will be needed. -
Page 15: 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 parts: A base module An electronic module A front connector TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 16: Module Coding
(Digital In, Digital Out, Analog In, Analog Out, Power) from the TB20 system. It will only be possible to plug an electronic module into a base module if the position of the coding plug and the position of the coding socket match. If the positions differ, the electronic module is mechanically blocked. -
Page 17: Installation And Removal
There will be enough space for cable management systems (if needed) The minimum clearances for mounting TB20 components are: 30 mm on the top and on bottom and 10 mm on each side. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 18: Installing And Removing Peripheral Modules
Finally, place the front connector on the electronic module from below in an inclined position and then gently push it onto the electronic module until the front connector fastener snaps into place with a soft click. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 19: Removal
To remove the front connector, push the tab above the front connector upwards (see the picture below). This will push out the front connector, after which you can pull it out. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... - Page 20 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 holding the lever down (see the picture below). TB20, strain gauge weighing module | Edition 1 | 21.12.2018...
- Page 21 Use a screwdriver to release the base module. Turn the screwdriver 90° counterclockwise to release. Step 4: Remove the base module Remove the base module by pulling it towards you. TB20, strain gauge weighing module | Edition 1 | 21.12.2018...
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Page 22: Replacing An Electronic Module
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 system is live, there is the risk of fatal... - Page 23 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 module while holding the lever down (see the picture below). TB20, strain gauge weighing module | Edition 1 | 21.12.2018...
- Page 24 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 and straight on the base module, bus malfunctions may occur. TB20, strain gauge weighing module | Edition 1 | 21.12.2018...
- Page 25 For more information on coding elements, please consult section 2.2.7. Step 4: Plug in the front connector TB20, strain gauge weighing module | Edition 1 | 21.12.2018...
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Page 26: Installing And Removing The Coupler
Step 2: Secure the coupler on the DIN rail Use the locking lever on the left side of the coupler to lock the coupler into position on the DIN rail. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 27: Removal
Step 2: Remove the coupler Use your middle finger to push on the lever from above and use your thumb and index finger to pull out the coupler while holding the lever down. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... - Page 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 towards you. TB20, strain gauge weighing module | Edition 1 | 21.12.2018...
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Page 29: Installing And Removing The Final Cover
DIN rail, until the cover covers the base module’s contacts and the tab snaps into place. 3.6.2 Removal Pull the final bus cover upward along and off of the module. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 30: Setup And Wiring
4 Setup and wiring 4.1 EMC/safety/shielding The TB20 IO system complies with EU Directive 2004/108/EC (“Electromagnetic Compatibility”). One effective way to protect against disturbances caused by electromagnetic interference is to shield electric cables, wires, and components. When setting up the system and laying the necessary cables, make sure to fully comply with all standards, regulations, and rules regarding shielding (please also consult the relevant guidelines and documents published by the PROFIBUS User Organization). -
Page 31: Front Connectors
1.5 mm² per terminal is not exceeded. The cables can be attached to the underside of the front connector with a cable tie. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 32: Wiring The Coupler
The coupler and the modules are grounded via the shield contact to the DIN rail. The DIN rail must be grounded. The surface of the DIN rail must be clean and conduct electricity well. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 33: Using Power And Isolation Modules
Its electronic module and base module have the same light gray color as the front connector, ensuring that all power and isolation modules will stand out visually in the system and make it easy to clearly distinguish each individual power supply segment. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 34: 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 isolation module can be used right after the coupler. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 35: Using Power Modules
Power modules must be used whenever the power supplied by the coupler alone 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. -
Page 36: Function Of The Ok-Led
This information can be read in a number of ways, one of which is using the “TB20 ToolBox” configuration and diagnostics software. The modules’ electronic nameplates not only make it possible to prevent configuration errors (setup), but also make maintenance (servicing) easier. -
Page 37: Tb20, Strain Gauge Weighing Module
A moving arithmetical average with the number n: 1 … 255 can be formed. After the start of the load cell module or the reconfiguring of the parameter, a correctly averaged measurement value is first available at the TB20 bus when the configured number of measurement values has been configured. No averaging takes place for the number 1. -
Page 38: Permanent Measurement Operation Mode
"1.000" can be used for 1 mV/V load cells and the value "2.000" for 2 mV/V load cells, etc. Determination of the characteristic value of the weighing module with the help of the TB20 ToolBox: Issuing of measurement value in mV/V ... -
Page 39: Offset Of The Load Cell
The offset value is a configuration parameter. The offset value must be transferred as a configuration value from the user program to the weighing module or be set with the help of the TB20 ToolBox. The offset value is permanently stored in the weighing module. The offset value can be changed by overwriting. -
Page 40: Linearization Through Sampling Points
The sampling point values must be transferred from the user program to the weighing module or be set with the help of the TB20 ToolBox. The sampling point values are permanently stored in the weighing module. The sampling point values can be changed by overwriting. Should one or more sampling points not be used, deactivation must take place via the parameter "Number of sampling... -
Page 41: Wire Break Test Of The Measuring Lines
When a wire break is determined, the error bit "Line break (=1)" IB 5 Bit 2 is set in the response data. The error bit "Line break (=1)" IB 5 Bit 2 is displayed in the TB20 ToolBox in online operation. Following evaluation, the user is to reset the error bit "Line break (=1)" IB 5 Bit 2 via the "Acknowledgment for control command has been executed"... -
Page 42: 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 parameters. The default values are documented in chapter 8. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 43: Pin Assignment
IDLE mode (quickly flashing blue LED) indicates modules that have not been added to ongoing system operation by the coupler. One of the reasons that can cause this is an incorrect configuration (wrong module model in the slot). TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 44: Commissioning
Min. bridge feed voltage Max. bridge feed voltage Configuration of the weighing module takes place via the user program of the bus master or the TB20 ToolBox. The parameter values are loaded to the weighing module at the start of the system. - Page 45 Sampling point 1 … 5 The configuration parameters are transferred from the user program to the weighing module or are set with the help of the TB20 ToolBox. The configuration parameters are permanently stored in the weighing module. See chapters 9.2 and 9.3...
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Page 46: Configuration With The Tb20 Toolbox
6.3 Configuration with the TB20 ToolBox In the TB20-ToolBox, positioning and configuration of the modules for the 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: ... -
Page 47: Install Tb20 Toolbox
Download the TB20 ToolBox from the Helmholz homepage www.helmholz.de. The TB20 ToolBox runs on Windows* 7, 8, 8.1, and 10. A cable with USB 2.0 A plug to USB Mini B plug is required for communication with a TB20 bus coupler. -
Page 48: Configuration Of The Weighing Module In A Project
When using CANopen, Ethernet/IP, ModbusTCP, EtherCAT, or DeviceNet, configuration takes place in the "Configurator" menu under "General." For configuration of the planned hardware, an upload of the TB20 ToolBox project takes place on the coupler. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 49: Display Of The Weighing Module
6.3.3 Display of the weighing module Online operation of the TB20 ToolBox enables observation 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 clicked. - Page 50 Other displays depending upon the bus coupler used. In the figure above, with the example of the ModbusTCP coupler: Input data length, tab Output data length, tab Parameter length Diagnoses TB20, strain gauge weighing module | Edition 1 | 21.12.2018...
- Page 51 Show "General" tab / parameters: The configuration of the planned hardware takes place through an upload of the TB20 ToolBox project to the coupler or through configuration with GSD or GSDML. +-20 mV or +-4 mV/V Measuring range +-10 mV or +-2 mV/V The resolution of the D/A converter is doubled in the measuring range 2 mV/V.
- Page 52 Control command executed: shows that a control command has been carried out. The bit must then be reset by the "Acknowledgment bit for system command was executed" OB5 Bit 7. TB20, strain gauge weighing module | Edition 1 | 21.12.2018...
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Page 53: Configuration And Reading Out Of The Measurement Values Without A Connection To The Bus Master
6.3.4 Configuration and reading out of the measurement values without a connection to the bus master With the "simulation" via the TB20 ToolBox, it is possible to temporarily configure and test a TB20 installation without a connection with a bus master, and thus also without a user program. - Page 54 Several changes can be made simultaneously Accepts the entries. A green background is visible during acceptance, and the yellow marking then disappears. All parameter settings are reversed following the end of simulation operation! TB20, strain gauge weighing module | Edition 1 | 21.12.2018...
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Page 55: Use The Weighing Module With Plcs
6.4 Use the weighing module with PLCs Depending upon the coupler type, the weighing module can be configured via the TB20 ToolBox or with coupler-specific methods. The data exchange with the weighing module is described in chapter 9. For configuration see chapter 8. -
Page 56: Measurement 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 measurement wiring that are appropriate for the input voltage range of the weighing module. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 57: Measurement Wiring
The supply voltage for the load cell comes from an external voltage source. The measuring lines are dead. The measurement connection of the bridge feed voltage is not necessary for the operation of the weighing module. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... - Page 58 The supply voltage for the load cell comes from an external voltage source. The measuring lines are dead. The measurement connection of the bridge feed voltage is necessary for the operation of the weighing module. TB20, strain gauge weighing module | Edition 1 | 21.12.2018...
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Page 59: Measuring Method
The bridge voltage resulting from the detuning of the Wheatstone bridge is measured. The weighing module provides a voltage of 5 V from the back wall bus of the TB20 system as feed voltage. The bridge connection can be fed externally. -
Page 60: Parameters Of The Weighing Module
Minimum voltage must be greater voltage Byte 13 When min. and max. values are zero, the than the minimum bridge feed monitoring of the bridge feed voltage is voltage. deactivated. Reserved Byte 14 TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 61: 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 offset + acknowledgment). -
Page 62: Diagnostic Messages
Bridge feed voltage is too large Wire break Writing/reading error for offset/sampling point ADC overflow or underflow Control command executed A configuration error is reported via the corresponding diagnostics. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 63: Set And Read Out The Offset/Sampling Point Values With The Plc
Example of configuration of the offset/sampling point values Prerequisite: A correctly configured TB20 load cell system in the cyclical data exchange with a PLC. When carrying out the following functions, only the calling up of an individual function via the corresponding bit is allowed. -
Page 64: Carry Out Wire Break Test
Following acceptance of the value by the user, the bit "Control command has been carried out" IB 5 Bit 7 is to be reset through the "Acknowledgment bit". The module is then once again in the operating mode Measure. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 65: Read Out And Change Offset/Sampling Point Values With The Tb20 Toolbox
9.3 Read out and change offset/sampling point values with the TB20 ToolBox With the help of the TB20 ToolBox, the measurement value of the load cell and the status displays of the weighing module can also be displayed in online operation without a connected master control system. -
Page 66: Setting Offset/Sampling Point Values
(kg with 2 decimal places without comma) Activate the offset/sampling point value to be displayed; green display (1). The field turns yellow. click in the right window (3). The window turns green following acceptance. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 67: Activation Of The Sampling Point Values
Check whether "Value valid" and "Ready for operation" are displayed in the right window. Not all configured sampling point values must be used. When activating fewer than 5 sampling point values, the lowest in the sequence is used. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 68: Deleting Offset/Sampling Point Values
9.3.5 Reading out offset/sampling 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 right window: ... -
Page 69: Wire Break Test
Continue with the next sampling 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). - Page 70 Deactivate the "Acknowledgment bit for control command" again (4). The field turns yellow. click in the right window (2). TB20, strain gauge weighing module | Edition 1 | 21.12.2018...
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Page 71: Important Instructions For Usage And Configuration
The values for the sampling points must be ascending in a strictly monotonic manner. Ascending in a strictly monotonic manner means that the following value is greater than the previous. Equal values are excluded with strict monotony. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... - Page 72 When the bus coupler is exchanged, the weighing module is reset to the factory setting and must be loaded with a saved project with the help of the TB20 ToolBox or reconfigured. The values for offset and sampling points are saved in the module and are retained, but can become invalid in the event of a deviating reconfiguration.
- Page 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 measurement procedure during testing; see chapter 9.1. TB20, strain gauge weighing module | Edition 1 | 21.12.2018...
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Page 74: Usage Instructions For Load Cells
2 are stretched and 2 are clinched. The TB20 strain gauge module is suitable for the use of commercially available load cells, force sensors, and torque sensors, and for the connection of own strain gauge applications in the field of technical data. -
Page 75: 4/6-Conductor Connection
The TB20 strain gauge module in the 6-conductor connection offers the possibility of measuring the feed voltage directly at the load cell with a dead measuring line. The measured feed voltage is incorporated into the calculation of the measurement value. -
Page 76: Minimum Gaging Value
The load cells used for the parallel connection must be coordinated with one another and approved by the manufacturer. The current draw of the load cells connected parallel may not overload the TB20 strain gauge module. 10.14 Measurement errors Measurement errors are mainly caused by the load cells and the connection technology. - Page 77 Non-linearity can be caused by mechanical influences of the weighing apparatus and occurs with semi-conductor strain gauges. Compensation may be possible with the help of the characteristic sampling points. Semiconductor strain gauges should only be operated in the linear characteristic range. TB20, strain gauge weighing module | Edition 1 | 21.12.2018...
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Page 78: Weighing Technology Terms
No intervention of any kind into the measurement chain for the purpose of improving / adjusting the displayed value to the benchmark (gaging weight). Gaging is imperative for contractual commerce and is clearly regulated by laws. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 79: Technical Data
11.2 Standards and guidelines Interference immunity: DIN EN 61000-6-2 “EMC Immunity” Interference emission: DIN EN 61000-6-4 “EMC Emission” Vibration and shock resistance DIN EN 60068-2-8:2008 "Vibration" DIN EN 60068-27:2010 "Shock" TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 80: Tb20 System Dimensions
12 TB20 System Dimensions TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 81: Spare Parts
The 25 mm standard base module is available in sets of five with order no. 600-900-9AA21. 13.1.3 Power and isolation base module The power and isolation base module is available in sets of five with order no. 600-900-9BA01. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 82: Power Base Module
The 10-terminal front connector is available in sets of five with order number 600-910-9AJ01. 13.2.2 20-terminal front connector The 20-pin front connector is available in sets of five with order no. 600-910-9AT21. TB20, strain gauge weighing module | Edition 1 | 21.12.2018... -
Page 83: Electronic Modules
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 cover The final cover is available in sets of five with order no. 600-920-9AA01. TB20, strain gauge weighing module | Edition 1 | 21.12.2018...
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