Technical data

Table Of Contents
Glossary
System Software for S7-300/400 System and Standard Functions - Volume 2/2
Glossary-4
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Continuous Controller
A continuous controller is a controller in which every change in the error signal
produces a change in the manipulated variable. This can adopt any value within
the range of the manipulated variable.
Control Device
The entire device used to determine the process variable. It consists of a controller,
a controlled device (i.e. actuator), and a sensor (measuring device).
Control Loop
The control loop is the connection between the process output (process variable)
and the controller input and between the controller output (manipulated variable)
and the process input, so that the controller and process form a closed loop.
Control System Group Message
A group message generated by the CPU operating system when a standard
diagnostic event is entered into the diagnostic buffer.
Controller Parameters
Controller parameters are characteristic values for the static and dynamic
adaptation of the controller response to the given loop or process characteristics.
CPU Operating System
The CPU operating system organizes all functions and processes of the CPU that
are not linked to a special control task.
Data Block (DB)
Data blocks are areas in the user program which contain user data. There are
shared data blocks which can be accessed by all logic blocks, and there are
instance data blocks which are associated with a particular function block (FB) call.
Diagnostic Buffer
The diagnostic buffer is a memory area in the CPU in which all diagnostic events
are stored in the order in which they occurred.
Diagnostic Data
Diagnostic data is information contained in an error message (diagnostic event,
time stamp).