Input Selector Function Block - Fisher FIELDVUE DVC6200f Instruction Manual

Instruction Manual
D103412X012

Input Selector Function Block

Overview
The Input Selector (ISEL) function block (figure 4‐12) can be used to select the first good, maximum, minimum,
average, or hot backup from as many as eight input values and place it at the output. The block supports signal status
propagation. There is no process alarm detection in the Input Selector function block. Figure 4‐13 illustrates the
internal components of the ISEL function block. Table 4‐40 lists the ISEL block parameters, their index numbers, and
descriptions.
Figure 4‐12. Input Selector Function Block
IN_1
IN_2
IN_3
IN_4
IN_5
IN_6
IN_7
ISEL
IN_8
DISABLE_1
DISABLE_2
DISABLE_3
DISABLE_4
DISABLE_5
DISABLE_6
DISABLE_7
DISABLE_8
OP_SELECT
Modes
The ISEL function block supports three modes of operation as defined by the MODE_BLK [5] parameter:
D Manual (Man)—The block output (OUT [7]) may be entered manually.
D Automatic (Auto)—OUT [7] reflects the selected input value.
D Out of Service (OOS)—The block is not processed. The BLOCK_ERR [6] parameter shows Out of Service. In this
mode, you can make changes to all configurable parameters. The target mode of a block may be restricted to one
or more of the supported modes.
The Input Selector block Actual mode will be Out of Service if any of the following are true:
D The Actual mode of the resource block is not Auto
D The Input Selector block Target mode is Out of Service
OUT
IN (1−8)
DISABLE (1−8)
OUT_D
OP_SELECT = Input used to override algorithm.
SELECTED
SELECTED
OUT_D
Detailed Setup—ISEL Function Block
= Input used in the selection algorithm.
= Discrete input used to enable or disable
the associated input channel.
= The selected channel number.
OUT =
The block output and status.
= Discrete output that signals
a selected alarm condition.
July 2013
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