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CHAPTER 4 FUNCTIONS
4
4.12 Alert Function
(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).
Ex.
When the temperature process value (PV) is on the position as below before the set value (SV) change
*1 Depending on the alert mode, this value becomes "set value (SV) monitor" or "set value (SV) setting". ( Page 195,
Section 4.12 (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.
Alert mode setting ( Page 204, Section 4.12 (7) (a))
Setting value Alert mode name
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))
Alert set value Set value (SV)
Temperature process value (PV)
Alert region
Before set value
(SV) change
Alert set value Set value (SV)
*1
Temperature process value (PV)
Alert region
After set value
(SV) change
Set value
(SV) change