Siemens SINUMERIK 828D Commissioning Manual page 1027

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There are two types of CHANGE method, i.e., element-specific and global:

● The element-specific CHANGE method is executed if the value of a specified variable

changes. If a system or user variable is assigned to a variable, cyclic updating of the variable

value can be configured in a CHANGE method.

● The global CHANGE method is executed if the value of any variable changes and no

element-specific CHANGE method has been configured.

"Element-specific" programming

Description:

DEF VAR1=(I//////"DB20.DBB1")

CHANGE(VAR1)

IF VAR1.Val <> 1

VAR1.st="Tool OK!"

"Global" programming

Description:

SINUMERIK Integrate Run MyScreens

Programming Manual, 10/2015, 6FC5397-3DP40-5BA3

VAR1.st="Attention: Error!"

(Identifier)

Changes the value of a specific variable

Name of the variable

; A system variable is assigned to Var1

; If the value of the system variable ≠ 1, the

short text of the variable states: Tool OK!

; If the value of the system variable = 1, the

short text of the variable states: Attention:

Changes any variable value

Programming commands

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