The following table lists the system parameters for the function block:
|
Parameter (Data Type) |
Default Value (Units) |
Characteristics |
Description |
|---|---|---|---|
|
DEV_ACT (Boolean) |
False |
NVM: Preserved on Download |
DEV_ACT is True if any good, non-disabled input deviates from the mid-selected input by more than DEV_LIM. |
|
DEV_HYS (Floating point) |
0 (Percent of IN_SCALE) |
Access: Configurable, Tuning NVM: Restored on Restart |
Hysteresis used for clearing DEV_ACT once it has been set. Value is in percent of IN_SCALE. |
|
DEV_LIM (Floating point) |
0 (Determined by supplying block or source) |
Access: Configurable, Tuning NVM: Restored on Restart |
Limit value in engineering units used to determine how far the good, non-disabled inputs are from the selected input. A value of 0.0 disables the DEV_ACT calculation. |
|
DISABLEn (Boolean) |
False |
Access: Tuning NVM: Preserved on Download |
When True, the input is not used in the mid selection algorithm. |
|
INn (Floating point with status) |
0 (Determined by supplying block or source) |
Access: Tuning NVM: Restored on Restart |
Input to select. |
|
IN_SCALE (Scaling) |
0.0 to 100.0 |
Access: Configurable, Tuning NVM: Restored on Restart |
Scaling parameter common to all inputs. |
|
OUT (Floating point with status) |
0 (Determined by supplying block or source) |
NVM: Preserved on Download |
Selected/calculated output. |
|
SELECTED (Discrete with status) |
0 |
NVM: Preserved on Download |
SELECTED is the number of the selected input. When MID is computed from an even number of inputs SELECTED is the number of the lowest valued of the two mid-valued inputs. |