Do you know how to scale an analog input or wire an analog output?

Analog signals can be difficult to work with in PLC programming. Wiring an analog input or output and using it in your program can both be tricky. Most example PLC programs use digital signals, as do most examples in my Structured Text Tutorial.

Many of you have asked how to use analog signals in PLC programming, so I wrote this article to explain them. Analog signals are common in PLC programs and in a SCADA system. We will cover how to connect a 4-20mA analog transmitter to your PLC and how to use that signal once it reaches your PLC program. We will also examine how to scale an analog signal in [...]

Thermocouples measure temperature quickly across a wide range. There are several types to choose from, each with its own temperature range and tolerance. Choose the thermocouple type that suits your project.