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Key Protection Section 4-8
4-8 Key Protection
4-8-1 Key Protect Function
The protect function limits the settings that can be changed to prevent inad-
vertently changing settings.
There are three protect mechanisms: “Communications writing” prohibits set-
ting changes from host communications, while “operation/adjustment protec-
tion” and “initial setting/communications protection” limit settings from the
E5ZN-SDL Setting Display Unit.
Communications
Writing
If the ‘communications writing” parameter is set to “0: Prohibited (off),”
changes to parameters other than “communications writing” are prohibited
from host communications.
Default is “1: Not prohibited (on).”
Operation/Adjustment
Protection
The following table shows the relationship between set values and the range
of protection.
♦: Can be displayed and changed
: Can be displayed
×: Cannot be displayed and moving to other levels not possible
• When this parameter is set to 0, parameters are not protected.
• Default is 0.
Initial Setting/
Communications
Protection
This protect level restricts movement to the initial setting level, communica-
tions setting level, and advanced function setting level.
: Moving to other levels possible
×: Moving to other levels not possible
Default is 0.
Level Set value
0123
Operation
level
PV
PV/SP ♦♦♦
Other ♦♦× ×
Adjustment level ♦×××
oapt
0
0u
Set value Initial setting level Communications
setting level
Advanced function
setting level
0
1 ×
2 ×××
icpt
0
0u
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