5 Advanced Operations
5 - 18
E5@C-T Digital Temperature Controllers User’s Manual (H185)
5-6 Using the Key Protect Level
• To move to the Protect Level, press the O and M Keys at the same time for at least three seconds*
in the Operation Level, Program Setting Level, Adjustment Level, or PID Setting Level.
* The key pressing time can be changed in the Move to Protect Level Time parameter (Advanced Function
Setting Level).
• The Protect Level protects parameters that are not changed during Controller operation until
operation is started to prevent them from being modified unintentionally.
There are four types of protection: operation/adjustment protect, initial setting/communications
protect, setting change protect, and PF Key protect.
• The protect level settings restrict the range of parameters that can be used.
z Operation/Adjustment Protect
The following table shows the relationship between set values and the range of protection.
5-6-1 Protection
• Parameters are not protected when the set value is set to 0.
• The default is 0.
0
oapt
Level
Set value
0 1 2 3 4 5
Operation
Level
PV
Can be
displayed
Can be
displayed
Can be
displayed
Can be
displayed
Can be
displayed
Can be
displayed
PV/
SP
Can be
displayed and
changed
Can be
displayed and
changed
Can be
displayed and
changed
Can be
displayed and
changed
Can be
displayed and
changed
Can be
displayed
Other
Can be
displayed and
changed
Can be
displayed and
changed
Can be
displayed and
changed
Can be
displayed and
changed
Cannot be
displayed and
moving to other
levels is not
possible
Cannot be
displayed and
moving to
other levels is
not possible
Program
Setting Level
Can be
displayed and
changed
Can be
displayed and
changed
Can be
displayed and
changed
Cannot be
displayed and
moving to
other levels is
not possible
Cannot be
displayed and
moving to other
levels is not
possible
Cannot be
displayed and
moving to
other levels is
not possible
Adjustment
Level
Can be
displayed and
changed
Can be
displayed and
changed
Cannot be
displayed and
moving to
other levels is
not possible
Cannot be
displayed and
moving to
other levels is
not possible
Cannot be
displayed and
moving to other
levels is not
possible
Cannot be
displayed and
moving to
other levels is
not possible
PID Setting
Level
Can be
displayed and
changed
Cannot be
displayed and
moving to
other levels is
not possible
Cannot be
displayed and
moving to
other levels is
not possible
Cannot be
displayed and
moving to
other levels is
not possible
Cannot be
displayed and
moving to other
levels is not
possible
Cannot be
displayed and
moving to
other levels is
not possible