Siemens SPS starter kit 6ED1057-3BA00-0AA8 12 Vdc, 24 Vdc 6ED1057-3BA00-0AA8 Hoja De Datos
Los códigos de productos
6ED1057-3BA00-0AA8
Reference material
5.3 Special functions
LOGO!Soft Comfort Online Help
294
Operating Instructions, 06/2014
Basic concepts of regulating
In the example, the current for the electric heating is the manipulated variable. The
changeable resistance is the actuator. The hand that operates the actuator is the control.
The actual room temperature is the controlled variable or the process value. The desired
room temperature is the command variable or the setpoint value. The electric heating is the
control process. The thermometer is the sensor. The temperature loss from opening the
window is the disturbance variable.
So this means that the person measures the process value (room temperature) with the
So this means that the person measures the process value (room temperature) with the
sensor (thermometer), compares the process value (room temperature) with the command
variable (desired room temperature) and uses the actuator (changeable resistance) to
manually regulate the manipulated variable (heating current), in order to compensate for the
disturbance variable (temperature drop from opening the window). The person is therefore
the controller.
The control device consists of the actuator and the control.
The control and controller together form the regulating device.
The following picture gives an abstract portrayal of the situation described above.
The comparing element uses the sensor to compare the command variable with the process
The control and controller together form the regulating device.
The following picture gives an abstract portrayal of the situation described above.
The comparing element uses the sensor to compare the command variable with the process
value. If the command variables and process value deviate from one another, this results in
a positive or negative loop error that in turn changes the process value.