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5-4

Ladder Logic (LAD) for S7-300 and S7-400

C79000-G7076-C504-02

Note

Attributes such as block protection, write protection and unlinked can only

be added to the block if it is being programmed as a source file in STL. If

you have created your block in Ladder, you must change to the programming

language STL using the menu command View

STL. You must then convert

the block into a source file before entering these attributes. Once the source

files are compiled into blocks the blocks are protected according to the

attributes you have selected.

Further information can be found in the STL Reference Manual /232/.

To configure the process control and process diagnostics, you can assign the

following system attributes in the “System Attributes” tabbed page.

Table 5-1 System Attributes for Process Control Configuration

Attribute Value When to Assign the Attribute Permitted Block

Type

S7_m_c true, false When the block will be manipulated or

monitored from an operator panel.

FB, SFB

S7_tasklist ’taskname1’,

’taskname2’, etc.

When the block will be called in organization

blocks other than in cyclic OBs (for example in

error or startup OBs).

FB, SFB, FC, SFC

S7_block-

view

big, small To specify whether the block is displayed in large

or small format.

FB, SFB, FC, SFC

Table 5-2 System Attributes for Process Diagnostics

Attribute

Value When to Assign the Attribute Permitted Block

Type

S7_pdiag true, false When the block will generate information

relevant to process diagnostics.

FB, FC, OB, DB

S7_pdiag_

unit

true, false When the block will generate information

relevant to process diagnostics and a unit of

measurement will be monitored.

UDT

S7_pdiag_

motion

true, false When the block will generate information

relevant to process diagnostics and a motion will

be monitored.

UDT

System Attributes

for Blocks

Editing the Block Properties and Testing the Program

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