National Instruments NI-FBUS - Manual (Page 89)

Chapter 4 Parameters
NI-FBUS Configurator User Manual 4-24 ni.com
MIN_CYCLE_T (Diagnostic, Process)
The length of the shortest macrocycle the device supports.
MODE_BLK (Diagnostic, Process)
Sets the operational and permitted modes of the block. The following table
describes the operational and permitted modes of the block.
Table 4-16. Field Modes
Field Mode Description
TARGET The desired mode of operation of the block. This field is writable. Several
bits may be set in this field, and typically, the highest priority bit that is set
will be considered to be the target mode.
OOS is the highest priority bit.
ACTUAL A bit reflecting the current state of operation of the block. This is a
read-only field. Only one bit will be set at a time by the block.
ACTUAL
mode is a function of the target mode and the current conditions in which
the block is executing. Several conditions (such as cascade initialization or
fault state conditions) can cause the
ACTUAL mode to differ from the
TARGET mode.
PERMITTED A bitmask indicating which modes are permitted target modes and which
are not. This field is writable. This could be used by the plant operator to
disallow certain modes the block would normally be permitted to have as a
TARGET mode.
NORMAL Not used by the block. This can be used by an operator to store the normal
mode of operation for the block in normal plant operations. This field is
writable. Used by the NI-FBUS Configurator to set the
TARGET mode after
download when the Automatic Mode Handling feature is in effect.
Table 4-17. Operational Modes
Operational Mode Description
Out of Service ( OOS ) The block is out of service, block execution is suspended, and all
output parameters take a status of
Bad::OutOfService .
Initialization Manual ( IMan ) The block is in the process of initializing a cascade. This is used
for upstream (control) blocks when they are initializing for
smooth transfer into
Automatic mode. This is not a valid
TARGET mode, but it is a valid ACTUAL mode.