OMRON Quick Start Instruction E5CC 4. Abbreviations and names SV: Set Value is the set and desired temperature PV: Process Value is the current, measured temperature MV: Manipulated Variable is the “power” the controller transmits to reach the desired temperature Set point: Also called set value or SV Sensor: External temperature measuring device Pt100: The Pt100 is a frequently used temperature reader. The reader has a resistance value of 100 Ohms at 0 degrees; Pt100s can be tested for continuity, and must have a value of around 106 Ohms at room temperature. For the Pt100 normal extension cables can be used 4-20mA:
4-20mA is a signal that is transmitted from certain sensors (for instance hygrometers), or which is used specifically to control a device, such as a steam valve Alarm: An output that is switched on at a certain temperature is often referred to as an alarm. An alarm output may also be used for other purposes, depending on its settings. Heat: This control is used for heating Cool: This control is used for cooling Heat/cool: This control is used for heating as well as cooling; therefore, two control outputs are used. PID: Correct PID parameters ensure accurate and stable control. PID parameters are values that can be changed manually, but are mostly achieved by running Autotune.
PID is the abbreviation of Proportional, Integration and Differentiation. 24