5. Creation of pages
Variable field characteristic
Protecting fields
Depending on the selected configuration, certain fields of the appli-cation page may not be write-accessed in confidential mode.
Access management for entry to a variable field is ensured by a system with several levels of protection.
(
see chapter D,
"Confidential mode, password management",
Page 18 ). The XBT-L1000
software can be used to define the various properties of the field.
.
Variable limits
The value of a variable can be in one of five posssible value zones:
- Value > Max
- H < Value < Max
- L < Value < H
- Min < Value < L
- Value < Min
For each of these zones, the object is given a particular color according to what was defined in XBT-L1000: variable color for alphanumeric objects, dial color for vumeters, etc.
For more details, see chapter D, "Field Characteristics", Page 34 .
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Graphic Magelis B - 29
5. Creation of pages
PLC Variable
Select the field on XBT-L1000, press "ALT+ENTER" key or "Edit / field properties" menu, then "general" and "modify" button to assign the PLC variable to the field.
Click modify to define the PLC variable representing the content of the field and click Ok to confirm.
Acces to the PLC
PLC variables can be acceded from the terminal fields by :
- Read : operator can not modify the value.
- Write : operator can modify the value.
- Read/Write : both cases above.
B - 30 Graphic Magelis
5. Creation of pages
Immediate write
Select the Options tab:
This entry mode is used by the operator to modify a field value in a continuous manner in order to:
- prevent sudden skipping from one value to another,
- view the result of an action "in real time" (adjustment, positioning, etc.).
See chapter D, "Immediate write", Page 37.
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Graphic Magelis B - 31
