National Instruments NI-FBUS - Manual (Page 82)

Chapter 4 Parameters
© National Instruments Corporation 4-17 NI-FBUS Configurator User Manual
DV_LO_LIM (Alarming)
The deviation limit between the PID block setpoint and process value,
in engineering units, beyond which the deviation low alarm is considered
active.
DV_LO_PRI (Alarming)
The priority of the deviation low alarm.
FAULT_STATE (Faultstate, Option)
The current status of the device faultstate. It can be set and cleared with
SET_FSTATE and CLR_FSTATE . If it is set, all output blocks in the device
initiate their own faultstate behavior.
FEATURE_SEL/FEATURES (Diagnostic, Option)
The FEATURES parameter lists features supported by the device. Use the
FEATURE_SEL parameter to manually enable and disable the supported
features listed in the FEATURES parameter.
Table 4-12. Feature Parameter Options
Option Description
Unicode The device supports strings in Unicode format. The FP-3000 does
not support this feature.
Reports The device supports event report messages for alarming. If this
feature is not selected in the
FEATURE_SEL parameter, the
FP-3000 continues to detect alarms and events, but does not report
them over the bus. In this case, the host must poll the alarm
parameters to detect alarm conditions as they change.
Faultstate The device supports Faultstate behavior for output blocks.
Soft Write Lock The device supports locking of configuration of parameters with
the
WRITE_LOCK parameter in the resource block. With this
feature selected and the WRITE_LOCK parameter written to Set ,
writes to all static configuration parameters are disallowed.
Hard Write Lock The device supports locking of configuration parameters. For the
FP-3000, a switch on the back of the device must also be set.
If
Hard Write Lock is enabled, the switch disallows writes to all
configuration parameters in the device, including FEATURE_SEL .