Fisher FIELDVUE DVC6200f Instruction Manual page 149

Instruction Manual
D103412X012
When the block is in the Manual mode the status and substatus of OUT [7] and SELECTED [21] will be as follows:
D Substatus will be non‐specific and the limit will be constant.
D Quality of OUT [7] and SELECTED [21] will be Uncertain if STATUS_OPTS [10] is "Uncertain if in Manual mode."
Otherwise, the quality of OUT [7] and SELECTED [21] will be Good Noncascade.
Limit Propagation
Refer to figure 4‐14. When SELECT_TYPE [19] is Average, Not Limited is propagated unless all inputs have the same
limit status. If ll inputs have the same limit status, the limit status of the inputs is propagated.
If SELECT_TYPE [19] is Middle and the number of inputs used by the algorithm is greater than one: Not Limited is
propagated unless all selected inputs have the same limit status, in which case the limit status of the inputs is
propagated.
If SELECT_TYPE [19] is Middle and a single input, or if Maximum or Minimum then: If the selected input is a constant
and Middle, Constant is propagated. Otherwise, if the selected input is a constant and Maximum or Minimum,
propagate low if Maximum, propagate high if Minimum. If the selected input is not a constant, propagate selected
input limit as is.
When SELECT_TYPE [19] is First Good or Hot Spare or if OP_SELECT [22] is non‐zero, propagate selected input limit as
is.
Substatus Propagation
Refer to figure 4‐15. For SELECT_TYPE [19] of Maximum, Minimum, First Good, Hot Spare, and Middle with only one
input, simply propagate substatus as is.
For SELECT_TYPE [19] of Maximum and Minimum with more than one input with the same value, propagate substatus
if all inputs are the same.
For SELECT_TYPE [19] of Average or Middle with more than one input, propagate NonSpecific.
If the status of OUT [7] is Bad, then the substatus will be as follows:
D Out of Service if the Target mode is Out of Service.
D Configuration Error with a BLOCK_ERR [6] of Configuration Error if the Actual mode is Out of Service.
D Otherwise a substatus of Non‐Specific.
Detailed Setup—ISEL Function Block
July 2013
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