Fieldbus output available on shear pin load cells
A
Vishay Nobel product story
Edited by the Engineeringtalk editorial team
Feb 2, 2001
Thermo Nobel's shear pin load cells are now available with an option of a digital Fieldbus output, which will give major cost savings in plant and system inter-wiring
Thermo Nobel announces a new enhancement to its range of shear pin load cells.
These load cells will be made available with an option of a digital Fieldbus output.
This will give major advantages in weighing and force measurement systems, where Fieldbus communications already exist or are planned and will give major cost savings in plant and system inter-wiring as well as enhanced data availability and quality at every measuring point.
The first range to carry this option will be the KOSD-40-I.
This is a double Shear pin manufactured in ranges from 10kN to 100kN and the "I" suffix means it will carry the Digi Amp intelligent digitisation option.
The output is two wire RS 485 with Modbus RTU protocol and the digital output can have 20,000 counts at 100 Hz bandwidth and up to 400,000 counts at 1Hz bandwidth.
Each cell can have its own identity number from 1 to 254.
Self diagnostics monitor faults such as short circuit or disconnected excitation, input open circuit, and communication errors and load cells are set to have a scaled digital output in engineering units with a known bandwidth and baudrate.
For example, a 50kN KOSD-40-I can be factory set so that it has an output of 0 -50,000 from 0 to 50kN, with a bandwidth of either 1, 10 or 100Hz, and a baud rate of anywhere between 2,400 to 38,400.
When installed in a force measurement or weighing system on site and connected to the Fieldbus system, this load cell can then be adjusted via the Fieldbus comms and re-scaled so that mechanical errors are allowed for, the dead load is offset, and linerisation is carried out.
The option is contained in the Digi Amp module, which is normally fitted into the back of the load cell during manufacture.
However, the design is such that it can be factory retrofitted to existing load cells.
The module is sealed to IP67 and fitted with an appropriate connector to allow T connections to other cells or appropriate termination at the last cell.
The Modbus output is then fed to the new Gate 3S translator module which allows interfacing to the rest of the Modbus network, or conversion into other Fieldbus protocols such as Profibus DP, DeviceNet, CANopen, Interbus and Ethernet.
The load cells meet CE requirements for both the RFI/EMI immunity and low voltage directives.
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