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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
The machine I've built punches holes into long strips of sheet metal. The sheet metal is fed through the machine in 1/4" increments. The operator inputs the position of the holes into the PLC. For example, if the part needs a hole punched at 2", 3.5" and 6", the operator keys in the 8th, 14th, and 24th location (since each position is 1/4"). The PLC then keeps track of the number of increments the sheet metal has moved and activates the hole punch at the appropriate time. My problem is that I want to allow the operator to enter a large quantity of numbers, and the way I'm writing my la