What does Analog Input or Output mean ?
The Analog Input Signal indicates the value of a function being measured. Some examples are pressures, liquid level, power etc. A device called a “Transducer” or “Transmitter” is used to convert the measured function into a current or voltage that varies in direct proportion to its input value. The industry standard is 4-20 Milliamperes (mA), however other values are often used. A typical Transducer might output 4 mA for zero pressure and 20 mA for 500 lbs. The Key Remote Terminal Units (RTU) fully support the value you specify. Analog output signals are also usually 4-20 mA and they are used to remotely control devices that require an incremental adjustment or a variable set-point.
