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Here you will find recent RonTronx projects.

BM TWIN 3900

For this client I was allowed to write the control software of an bending bench. The bench has been developed and manufactured by the client themselves and is intended to make special profiles. The profiles are eventually used for decoration in a facade of a new London underground station.

*Dit model is gelijkend op het orgineel.


For this project I used a SIMATIC S7-1200 micro-PLC and a SIMATIC HMI KTP1200 Basic PN panel. The PLC and the panel are interconnected through a PROFINET interface. The software architecture is based on the statemachine model. The program is written in the SCL programming language.The panel houses multiple screens. The main screen shows an overview of the sofa with all rotating and moving parts. Settings of the bank can be entered in the settings screen.

To create a profile, the operator presses the two-hand control of the bending bench. A folding table comes up. The operator places the plate to be worked on the table against the stop. The plate is then pneumatically clamped with a foot switch. Again the operator presses the two-hand control. An upper beam moves downwards and the plate is thereby hydraulically clamped over the full length. The folding table releases the plate and moves downwards. With a 'butterfly stroke' -like movement, two bending tables rise and bend the plate into the correct shape until the set angle is reached. The bending tables then move downwards again and the upper beam goes up to its working position. The operator removes the profile and the machine is ready for the next operation.


  • Digital outputs 14

  • Digital inputs  12

  • Analogue inputs1

  • GUI with machine status.

  • GUI Settings.


  • Automatic bending process control.

  • Two hand operation.

  • Switch off aggregate after inactivity.

  • Error detection.Resume bending process after releasing control.

  • Precise angle measurement.

  • Status indication signal lamps.




Anemometer test bench
GWF Anemometer

The different sensors can be calibrated with the new software.


During the calibration process, the sensors are brought into a state where they go through their range. The values that they provide are compared with the values of a reference meter. Both values are stored in a calibration table.


During the test, where the actual flow is determined by the Anemometer, the measured values are interpolated to the calibrated values.


The calibration values are stored per sensor in the system and can be printed with the data of the reference used.

The client is a company in Switzerland that develops precision measurement systems for the measurement of gas, water and electricity. One of their products is the 'Anemometer'. This type of flow meter is used in operating rooms to ensure sufficient fresh air.


Before the meter leaves the factory, it undergoes a test in which the correct indication is tested. For this they use an Anemometer test bench. The software for this test bench was developed by RonTronx in the past. During the testing, different measurements are taken with different sensors. Think of pressure, temperature and time / pulse measurement.


To be able to demonstrate traceability to the Swiss national standard, these sensors must be calibrated.


The client asked me to implement this calibration functionality in the software.


GWF anemometer testbench

I wrote the application in Delphi, RAD studio 2010. The hardware consists of a BK7300 Beckhoff head station with different KL-I / O modules. The head station is in fact a modbus server with an RS485 interface. The data exchange between the software and the head station is via an additional FL-comserver module for converting Ethernet to serial RS-485.

RTAO current source
  • Stable 4-20mA current control.

  • Lab connector connection

  • Ten strokes potmeter.

  • Fed from power loop.

  • Sturdy housing.

  • Setting lock.



Sometimes it happens that a programmer wants to test his software but that the hardware is not yet ready. Simulating an analog input (4-20mA) is then not always that simple. Existing solutions available on the market are expensive. It was time for an affordable easy to use solution.


The result is an electronic circuit built around a programmable power source. Because the power source, just like with a real sensor, is connected in the circuit of the analog input card, no additional power supply is required. The power source is limited to just below and just above 4-20mA. As a result, the entire current can be amply traversed. We have succeeded in installing a maximum of four of these circuits in one housing. On top of the housing there is per channel a ten-stroke potentiometer. This allows the current to be adjusted very accurately. Lab connectors are located on the side. For example, analogue PLC inputs can be connected here using banana plugs. In total, three versions have been developed with 1, 2 and 4 channels respectively.

The RTAO is an ideal tool that can be used directly for the development and testing of hardware and software. For the user manual I refer you to the Download page.


The RTAO is available through the RonTronx Webshop !.

Comming up next...

I am busy with the preparations for setting up a web store where spare parts for gas meter test installations can be purchased. The intention is that the parts can be delivered with very short delivery times. More about this later ...If you want to know how I work, click here.

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