Requirement
A customer required a line speed display so that the operators in the factory could get an idea of their production. The information had to be displayed on large displays. A daily report was required where a snapshot was taken of all line speeds every 15 minutes and a daily report generated.
Solution
We installed a PLC monitoring the line speed VSD. At the control room I installed a Unitronics Unistream HMI with built in webserver. The Unitronics HMI polled all the PLCs using Modbus RTU, scaled all the line speeds and posted them on the webserver. A raspberry Pi in kiosk mode was installed at 72” TV to display all the speeds.
The Unitronics PLC would also log all the speeds every 15minutes and store it in a csv file every morning. I wrote a macro in Excel to present the data and the operator opened it using a ftp server built into the HMI
Shaun Thomas