EXAMPLE 6

Latching Alarm

Configuration:

 

Process Variables:

 

Process Variable

1

PV1 Display Tag

users choice

PV1 Input

IV1

A11 Alarm Type

Process - High

A11 Hysteresis

3

LEDs:

 

LED Number

8

LED 8 Actuator

DA1

Relays:

 

Relay Number

4

Relay 4 Usage

State or On-Off

Relay 4 Actuator

DA1

Derived Actuators:

 

Derived Actuator

1

DA1 Item 1

Not

DA1 Item 2

Reset

DA1 Item 3

And

DA1 Item 4

DA1

DA1 Item 5

Or

DA1 Item 6

A11

DA1 Item 7

End

Derived Actuator 1 will be true when A11 is true OR when DA 1 is true AND the Reset Key is not true. To cause Derived Actuator 1 to be false, press the Reset key, providing the process has gone below the alarm set point.

Note: The LED 8 and Relay 4 will remain latched until the Reset Key is pressed although the display will no longer display the "H" or the "g" (global indicator).

Edition 3

D-4

Appendix D

Rev G

Page 317
Image 317
Anderson Manufacturing AV-9000 manual Derived Actuators DA1 Item Not Reset