Siemens NAN 67 Series Manual de servicio descargar pdf (Pagina 35)

3-11

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

C79000-G7076-C504-02

3.6 Assigning System Attributes for Parameters

You can assign system attributes to blocks and parameters. These influence

the message and connection configuration, operator interface functions, and

process control configuration.

You can assign system attributes for parameters in the variable declaration

table.

To enter system attributes for parameters, select the name of the parameter in

the variable declaration table and select Edit

Object Properties in the

menu bar to display the Properties dialog. Select the “System Attributes”

tabbed page and enter the required attribute and its value.

Table 3-3 shows which system attributes you can enter in the variable

declaration table.

Table 3-3 System Attributes for Parameters

Attribute Value When to Assign the Attribute Permitted

Declaration type

S7_server connection, alarm_archiv When the parameter is relevant to connection or

message configuration. This parameter contains

the connection or message number.

S7_a_type alarm, alarm_8,

alarm_8p, alarm_s,

notify, ar_send

When the parameter will define the message

block type in a message block (only possible

when the S7_server attribute is set to

alarm_archiv).

IN, only with blocks

of the type FB and

SFB

S7_co pbkl, pbk, ptpl, obkl, fdl,

iso, pbks, obkv

When the parameter will specify the connection

type in the connection configuration (only

possible when the S7_server attribute is set to

connection).

S7_m_c true, false When the parameter will be modified or

monitored from an operator panel.

IN/OUT / IN_OUT,

only with blocks of

the type FB and SFB

S7_shortcut Any 2 characters, for

example, W, Y

When the parameter is assigned a shortcut to

evaluate analog values.

IN/OUT / IN_OUT,

only with blocks of

the type FB and SFB

S7_unit Unit, for example, liters When the parameter is assigned a unit for

evaluating analog values.

IN/OUT / IN_OUT,

only with blocks of

the type FB and SFB

System Attributes

Entering System

Attributes for

Parameters

Creating Logic Blocks

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 317 318

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