Siemens SINUMERIK 840DE sl Commissioning Manual page 752

Generating user dialogs
1.7 XML identifier
Tag identifier
OPERATION
PASSWORD
POWER_OFF
34
Meaning
Operation
Instructions can be moved within an equation.
Move left "<<" operator
The << function moves bits to the left. You can specify the value and the number of move
increments directly or with a variable. If the limit of the data format is reached, the bits will
be moved beyond the limit without an error message being issued.
Execution rule
Execution from left to right; '+' and '-' have priority over '<<' and '>>'
Example:
<op> idx = idx << 2 </op>
<op> idx = 3 + idx << 2 </op>
Move right ">>" operator
The >> function moves bits to the right. You can specify the value and the number of move
increments directly or with a variable. If the limit of the data format is reached, the bits will
be moved beyond the limit without an error message being issued.
Execution rule
Execution from left to right; '+' and '-' have priority over '<<' and '>>'
Example:
<op> idx = idx >> 2 </op>
<op> idx = 3+idx >> 2</op>
This tag is used to unlock additional units for the "EasyExtend" function.
The specified character string is written to the specified reference variable and must be
processed in the PLC user program.
Syntax:
<PASSWORD refVar ="<variable name>" />
Attributes:
● refVar
Name of the reference variable
● text
Specifying an attribute replaces the default text (optional)
Example:
<PASSWORD refvar="plc/mw107" />
Example optional:
<password refVar = "plc/MD108" text="Password" />
A message prompts the operator to switch the machine off. The message text is perma‐
nently saved in the system.
Programming Manual, 12/2017, 6FC5397-1DP40-6BA1
Easy XML