Diagnostic parameters, Table 4-2. diagnostic parameters, Faultstate parameters – National Instruments NI-FBUS User Manual

Page 67: Diagnostic parameters -2 faultstate parameters -2

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Chapter 4

Parameters

NI-FBUS Configurator User Manual

4-2

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Diagnostic Parameters

Diagnostic parameters help you find problems in the operation of the
device. They also provide general information about the device and its
capabilities.

Faultstate Parameters

Foundation Fieldbus output function blocks (AO, DO, and CDO) support a
faultstate to deal with the case where the control of the output block has
been lost while the block is in Cascade mode. If the block is in Cascade
mode, and

CAS_IN

has a bad quality for longer than the time specified in

the

FSTATE_TIME

parameter, the block enters faultstate. If the Faultstate

Use Value option is set in the

IO_OPTS

parameter, the block uses the value

in

FSTATE_VAL

as its output value. If the option is not set, it holds the value

it had at the time the input went bad until the cascade can be reestablished.

The faultstate is a predefined state that outputs will go to if certain
conditions are met. For example, if the valve analog output block loses
communication with the block that is giving it information, it can be set to
close automatically.

Table 4-2. Diagnostic Parameters

BLOCK_ALM

MEMORY_SIZE

BLOCK_ERR

MIN_CYCLE_TIME

DD_RESOURCE

MODE_BLK

DD_REV

NV_CYCLE_T

DEV_REV

RESTART

DEV_TYPE

RS_STATE

FEATURE_SEL/FEATURES

ST_REV

FREE_SPACE

TAG_DESC

FREE_TIME

UPDATE_EVT

MANUFAC_ID

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