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(4) Alert with standby (second time)
A function to deactivate the alert function once again when the set value (SV) is changed is added to an alert with
standby. This is called an alert with standby (second time).
When control needs the set value (SV) change, the alert supposed to occur can be avoided when the set value is
changed by selecting an alert with standby (second time).
When the temperature process value (PV) is on the position as below before the set value (SV) change
Ex.
Before set value
(SV) change
After set value
(SV) change
*1
Depending on the alert mode, this value becomes "set value (SV) monitor" or "set value (SV) setting". (Page 170,
Section 8.3.11 (2) (a))
For a deviation alert, when the set value (SV) is changed, the temperature process value (PV) goes into the alert
area; therefore, the system goes into an alert status.
To prevent the case above, the alert output is put on standby.
(a) Setting method
Select one of the following alert modes.
Setting value
12
Upper limit deviation alert with standby (second time)
13
Lower limit deviation alert with standby (second time)
14
Upper lower limit deviation alert with standby (second time)
22
Upper limit deviation alert with standby (second time) (using the set value (SV))
23
Lower limit deviation alert with standby (second time) (using the set value (SV))
24
Upper lower limit deviation alert with standby (second time) (using the set value (SV))
Remark
If a setting change rate limiter is specified, an alert with standby (second time) is not active even though one of the following
alert modes is selected.
Setting value
12
Upper limit deviation alert with standby (second time)
13
Lower limit deviation alert with standby (second time)
14
Upper lower limit deviation alert with standby (second time)
Temperature process value (PV)
Alert area
Alert set value
Temperature process value (PV)
Alert area
Alert set value
Alert mode setting (Page 176, Section 8.3.11 (6) (a))
Alert mode setting (Page 176, Section 8.3.11 (6) (a))
Set value (SV)
Set value
(SV) change
Set value (SV)
Alert mode name
Alert mode name
CHAPTER 8 FUNCTIONS
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