The Input Selector function block is a mathematical and logical input calculation block. The Input Selector chooses an output based on up to 4 inputs. This block supports mode control (Auto, Manual, Out of Service).
There is no standard alarm detection in the Input Selector function block.
DISABLE_1 when True, is used to disable IN_1. Disabled inputs are not used in by any of the select algorithms.
DISABLE_2 when True, is used to disable IN_2. Disabled inputs are not used in by any of the select algorithms.
DISABLE_3 when True, is used to disable IN_3. Disabled inputs are not used in by any of the select algorithms.
DISABLE_4 when True, is used to disable IN_4. Disabled inputs are not used in by any of the select algorithms.
IN_1 is the first input value.
IN_2 is the second input value.
IN_3 is the third input value.
IN_4 is the fourth input value.
OP_SELECT if non-zero, selects the corresponding input (that is, 2 selects IN_2). If zero, the algorithm selected by SELECT_TYPE selects input.
OUT is the output value and status.
SELECTED indicates the selected input or the number of usable inputs.
The following diagram shows the internal components of the Input Selector function block:
