Siemens pa module p03-01 Manuel D’Utilisation
Industry Sector, IA&DT
SCE Training Curriculum
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PA Module P03-01, Edition 09/2013
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P03-01_AdvancedLayout_R1309_en.doc
T
HEORY
H
IERARCHY OF
F
LOW
D
IAGRAMS
In chapter P02-01 the objectives of process control as well as of basic design concepts and
techniques for OCM interfaces (operator control and monitoring interfaces) were described.
techniques for OCM interfaces (operator control and monitoring interfaces) were described.
Chapter P01-03 introduced the physical model of a system consisting of a plant, a plant
section, equipment module and an individual control unit. Analogously, a hierarchy of flow
diagrams exists in process visualization that is arranged as follows, according to [1]:
section, equipment module and an individual control unit. Analogously, a hierarchy of flow
diagrams exists in process visualization that is arranged as follows, according to [1]:
– Plant diagram
– Area diagram
– Plant section/group diagram
– Detail diagram
The hierarchy of the flow diagram facilitates orientation and specific display selection. The
uppermost levels Plant display and Area display provide an overview and are usually
represented schematically. In small plants, the plant display corresponds to the area
display (refer to Figure 1). In the plant display, it has to be possible to select each area
directly. In the area display, the plant sections are displayed in a manner that their state
can be recognized and the plant section can be selected and operated. The plant section
and group display reflect functional relationships; typical units, final control units and
control systems can be operated. Detail displays are of great importance to parameter
assignment, commissioning and error search if there are plant faults. In detail displays,
individual devices and units are represented and by means of effective lines, the functional
relationships can be visualized. For example, the signal flow of a control loop can be
tracked. [1].
uppermost levels Plant display and Area display provide an overview and are usually
represented schematically. In small plants, the plant display corresponds to the area
display (refer to Figure 1). In the plant display, it has to be possible to select each area
directly. In the area display, the plant sections are displayed in a manner that their state
can be recognized and the plant section can be selected and operated. The plant section
and group display reflect functional relationships; typical units, final control units and
control systems can be operated. Detail displays are of great importance to parameter
assignment, commissioning and error search if there are plant faults. In detail displays,
individual devices and units are represented and by means of effective lines, the functional
relationships can be visualized. For example, the signal flow of a control loop can be
tracked. [1].
Multi purpose plant
Educt tanks
Reaction
Product tanks
Tank 1
Rinsing
Tank 2
Tank 3
Reactor
1
Reactor
2
Tank 1
Tank 2
Tank 1
Plant and area
display
Plant section
display
Detail display
Figure 1: Hierarchy of mimics
C
URVES
Curves are used for process control during intended operation, or for diagnosing faults [2].
They supplement the display with flow diagrams, particularly because they indicate the
dependence of process values on time.
They supplement the display with flow diagrams, particularly because they indicate the
dependence of process values on time.
Related displays are: the display of a process value depending on the path, on other
process variables, and even of several reference variables that are not described here,
however.
process variables, and even of several reference variables that are not described here,
however.