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Appendix C

Fieldbus Parameters

C-18

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 National Instruments Corporation

The current state of the device. Table C-13 lists device states.

An interlock input. When in 

Discret_State_1

, the output of the block is 

forced closed (

Discret_State_0

). This interlock input has priority over 

all other interlock inputs.

An interlock input. When in 

Discret_State_1

, the output of the block is 

forced open (

Discret_State_1

). This interlock input has priority over all 

other interlock inputs except 

SAFEGUARD_CL

.

Allows the user to set the device faultstate to active. This, in turn, forces all 
output blocks into their own faultstate behavior.

Controls the way blocks enter mode shedding. Each option listed below has 
a companion 

No Return

 option. The 

No Return

 shedding options change 

the target mode of the device to the shed mode and prevent the device from 
re-entering 

RCas

 or 

ROut

 mode after the shed condition has ended. 

Table C-14 lists shed conditions. Refer to Appendix D, 

, for more information about mode shedding.

Table C-13.  Device States

Start/Restart

The device has just started a restart cycle.

Initialization

The device is performing startup 
diagnostics.

Failure

A hardware failure has been detected.

On-Line Linking

The device is online and waiting for new 
parameter linkages to be established.

On-Line

The device is online and in service.

Standby

The device is online, but currently out of 
service.