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Dear UNITRONICS users. Sometimes it happens that you need more digital inputs on the OPLC because of pushbuttons. A solution is an OPLC with a larger number of inputs or an extension needs to be added when is possible. That can be expensive. I developed a simple solution, which I named, the pushbuttons to current loop converter. In this case, you only need one analog input (4 – 20mA), to add up to 19 pushbuttons via two-wire shielded cable which can be up to 100m long. The converter is self powered ( powered from current loop ). The converter is reliable, since a very stabilized reference circuit is used. The error is maximum +/- 1 digit on 10bit AD I attach software for JAZZ with examples for easier understanding. It can be also used with others OPLC. The converter is only available in our company for now. For further info write on Email firstname.lastname@example.org. Best regards Robert Mramor s.p. Pushbutton to current loop - debouncing.U90