Appendix C
Fieldbus Parameters
FieldPoint FP-3000 User Manual
C-2
©
National Instruments Corporation
BINARY_OP
An interlock input. When in
Discrete_State_1
, the output of the block
is forced open (
Discrete_State_1
). This interlock input has priority
over all interlock inputs, except
SAFEGUARD_CL
and
SAFEGUARD_OP
. In
the event
BINARY_OP
and
BINARY_CL
are in
Discrete_State_1
, both
are considered to be in
Discrete_State_0
.
BKCAL_HYS
The amount a block’s output value must move off a limit, in percent of
scale, for the limit status to be turned off.
BKCAL_IN
The value from a downstream block’s
BKCAL_OUT
parameter. This is used
to initialize a control loop through cascade initialization. Cascade
initialization allows smooth transfer for a control block from
Manual
to
Auto
mode. To bypass cascade initialization, this parameter can be left
unwired and manually set to a status of
Good, non-cascade
.
BKCAL_OUT
A back-calculation value published to an upstream block in a control loop.
The
BKCAL_OUT
parameter has the value of the block’s current output.
Before a cascade loop is initialized, the upstream block can use this value
to smoothly transfer to loop control.
BLOCK_ALM
An alarm parameter used to report error conditions detected within the
block, such as block
Out of Service
.
BLOCK_ERR
A list of error conditions detectable by the block. Table C-1 lists all active
error codes.