Appendix C Fieldbus Parameters
FieldPoint FP-3000 User Manual C-2
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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. TableC-1 lists all active
error codes.