The Fieldbus Input Selector Extended (FFISELX) function block is a mathematical and logical input calculation block. The block chooses an output based on up to 8 inputs. This block supports mode control (Auto, Manual, Out of Service).
DISABLE_1 through DISABLE_8, when True, disable the corresponding IN_n input. For example, DISABLE_1 disables IN_1, DISABLE_2 disables IN_2, and so on. The SELECT_TYPE algorithms do not use disabled inputs.
IN_1 through IN_8 are the input values.
OP_SELECT, if non-zero, selects the corresponding input (for example, 2 selects IN_2). If zero, the algorithm selected by the SELECT_TYPE parameter selects input.
OUT is the analog output value and status.
SELECTED indicates the selected input or the number of usable inputs.
OUT_D is the discrete output value and status that signals a selected alarm condition.
The following diagram shows the internal components of the Input Selector Extended function block:
