National Instruments NI-FBUS - Manual (Page 67)

Chapter 4 Parameters
NI-FBUS Configurator User Manual 4-2 ni.com
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 —