Manual Siemens LOGO Soft Comfort Online Help (page 320 of 414) (English)

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Reference material

5.3 Special functions

LOGO!Soft Comfort Online Help

320 Operating Instructions, 11/2017

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

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

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.

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Siemens LOGO Soft Comfort Online Help Manual

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