Siemens Welding System ST PCS 7 사용자 설명서

ES software

Siemens ST PCS 7 · November 2007

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The OS areas and the image hierarchy for process control, as 

well as the SIMATIC PCS 7 asset management, can be derived 

from the technological hierarchy. Furthermore, it also forms the 

basis for the plant-oriented identification of process objects.
Common displays can be positioned in pictures by means of the 

image hierarchy, and automatically linked to subordinate im-

ages. The configuration engineer is only responsible for the cor-

rect positioning. Since the number of common display fields and 

their semantics can be configured, it is also possible to imple-

ment customized alarm configurations.
Using the process object view, "Smart Alarm Hiding" can also be 

configured This function is understood as the dynamic hiding of 

messages (alarms) of the technological blocks grouped in a 

plant unit which are of secondary importance depending on the 

operating state of this unit (startup, service, etc.). Alarms can be 

displayed or hidden separately for each of the maximum 

32 operating states through selection of option boxes in the 

alarm matrix of the process object view. Although hidden alarms 

are not signaled visually and audibly, they are still logged and ar-

chived as before.

The CFC editor is the tool for graphical configuration and com-

missioning of continuous automation functions. Preengineered 

function blocks can be positioned, configured and intercon-

nected within CFCs with the support of powerful autorouting and 

integral configuration of HMI messages. Special configuration 

techniques such as chart-in-chart for implementing hierarchical 

plans or the multiple usage of chart block types (chart compiled 

as block type) or SFC types (standardized sequential controls) 

in the form of instances offer an additional rationalization poten-

tial.
When creating a new CFC, a new runtime group with the same 

name as the chart is created. All the blocks that are subse-

quently entered in the chart are automatically added to this run-

time group. Each block is therefore already assigned runtime 

properties when inserting, and these properties can be opti-

mized by means of modifications in the runtime editor or by us-

ing algorithms.
The algorithm first determines the optimum block sequence sep-

arately for each runtime group, and then the optimum sequence 

of runtime groups.
In addition to convenient editing functions, the scope of CFC 

functions also includes powerful test and commissioning func-

tions as well as individually configurable documentation func-

tions.

Continuous function chart

The SFC editor is used for the graphical configuration and com-

missioning of sequential controls for batch production opera-

tions. It possesses convenient editing functions as well as pow-

erful test and commissioning functions.
Using a sequential control, basic automation functions usually 

created using CFC are controlled and selectively processed by 

means of changes in operating mode and status. Depending on 

the subsequent use, the sequential controls can be created ei-

ther as a SFC plan or SFC type.
SFC plan
The SFC plan can be used to implement sequential controls 

which can be applied once and which access several partial ar-

eas of the production plant. Each SFC plan contains standard-

ized inputs and outputs for status information and for control by 

the user program or the user. The SFC plan can be positioned 

and linked as a block in the CFC. The required CFC block con-

nections are selected by simple operations and connected to 

the steps or transitions of the step chains. An ISA 88-conform 

status manager enables the configuration of up to 8 separate se-

quence chains within a single SFC, e.g. for states such as 

HOLDING or ABORTING, for SAFE STATE or for different operat-

ing modes.
SFC type
SFC types are standardized sequential controls which can be 

applied repeatedly and which access one partial area of the pro-

duction plant. They can be organized in libraries, and handled 

like normal function blocks, i.e. they can be selected from a cat-

alog and positioned, interconnected and parameterized as an 

instance in a CFC plan.
Changes to the original automatically result in corresponding 

changes in all instances. An SFC type may contain up to 

32 sequences. Using the function "Create/update block sym-

bols", a block symbol is automatically positioned and intercon-

nected in the associated process display for all SFC instances 

with HMI features.

Sequential function chart

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