Chapter 5. FUNCTIONS

PV deviation rate event

PV deviation is measured in each sampling cycle set using the event configuration data setting while on/off states are determined by comparing event setting deviation rate ∆PVs.

PV deviation between sampling cycles is ignored. Event on/off switching is performed according to the sampling cycle. This function can be combined with event on delay.

Set event value is more than 0 (using upper limit event)

PV

Set event value

Set event

Set event value

value

 

 

 

Time

 

 

 

Sampling cycle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PV deviation rate

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

upper limit event

 

 

OFF

 

 

ON (up alarm)

 

 

OFF

operation

 

 

 

 

 

 

 

 

 

 

PV deviation rate

 

 

 

 

 

 

 

 

 

 

 

ON

 

OFF

 

 

ON

lower limit event

 

 

 

 

 

 

 

 

 

 

 

 

operation

 

 

 

 

 

 

 

 

 

 

Sampling (1)

(2)

(3)

(4)

Set event value is less than 0 (using lower limit event)

PV

Set event value

Set event value

Set event value

Time

 

 

Sampling cycle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PV deviation rate

 

 

 

 

 

 

 

 

 

ON

 

 

 

 

 

ON

upper limit event

 

 

OFF

 

 

 

 

 

 

 

 

operation

 

 

 

 

 

 

 

 

 

PV deviation rate

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

lower limit event

 

 

 

 

ON (down alarm)

 

 

OFF

operation

 

 

 

 

 

 

 

 

 

Sampling (1)￿

(2)

(3)

(4)

5-11

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Image 57
Honeywell DCP552 Mark II user manual PV deviation rate event