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EXCEL 50/100/500/600/800 ATTRIBUTES
EN2B-0092GE51 R0512
37
Write Protection
The attribute "Write Protection" (XBS, only) prevents data from being overwritten.
The default setting of the attribute is 0 (="No"). If the datapoint should be protected,
then "No" must be overwritten with a value between 0 and 100.
0 = No write protection
100 = Highest priority required
To change this attribute, the operator must log in at an operator level that
corresponds to the current write protection attribute (see Table 16).
Table 16. Access values for operator levels
operator level XBS
access for write protection values
1 no access
2 no access
3 0 to 60
4 0 to 80
5 0 to 100
The operator's authority level is compared to the write protection status of the
datapoint to establish whether or not any modification can be made.
As soon as the operator receives permission, he can alter the attribute of secured
datapoints. The operator can also set the write protection to a higher value or
cancel write protection completely.
Example: A datapoint with a write protection value of 61 can be altered only at operator level
4 or 5.
The write protection can be reduced to 0 from level 4 as well as level 5. The
datapoints can be altered through level 3. A detailed high priority can then be given
through the write protection.
NOTE: When online, the XI581 (not with XCL5010, Excel 100C), XI582, and XL-
Online operator interfaces and the XL50-MMI do not recognize the
attribute "Write Protection". You can still change any datapoint via the
user interface, even if the datapoint is write-protected.