Echelon i.LON SmartServer 2.0 - Manual (Page 129)

i.LON SmartServer 2.0 Programmer’s Reference 8-11
20 30 40 50 35 EMPTY 0.0 0
70 80 40 50 35 EMPTY 100.0 1
8.3.2.2.2 FN_OR Example
In this example, there are four input data points and one compare data point, all of the type
SNVT_count. There is one output data point, of the type SNVT_switch.
<UCPToutputFunction>: FN_OR
<UCPTcompFunction>: FN_LT
Because the output function is FN_OR, and the comparison function is FN_LT, one of the values of
the data inputs must be less than the value of the compare data point, or the <UCPTtrueThreshold>
value if it is defined, for the output data point to be set to True. If the <UCPTtrueThreshold> property
is defined, then value of the compare data point is not used in the comparison.
The following table lists several case scenarios that show when these two functions might evaluate to
True (100.0 1).
Input 1 Input 2 Input 3 Input 4 Value of Compare Data
Point
UCPTtrueThreshold Output
9 11 12 13 Does not matter since
<UCPTtrueThreshold> is
defined.
10 100.0 1
20 30 40 50 15 EMPTY 0.0 0
20 30 40 50 25 EMPTY 100.0 1
20 30 40 50 35 EMPTY 100.0 1
8.3.2.2.3 FN_COMPARE Example
In this example, there are four input data points and one compare data point, all of the type
SNVT_count. There is one output data point, of the type SNVT_switch.
<UCPToutputFunction>: FN_COMPARE
<UCPTcompFunction>: FN_EQ
<UCPTmajorityValue>: 100
Because the <UCPTmajorityValue> is set to 100, all comparisons made between the input and
compare data points must return True for the output data point to be set to True. The comparison
function selected is FN_EQ, so this means the values of the input data points must match the value of
the compare data point, or the <UCPTtrueThreshold> property if it is defined, for this to happen. If the
<UCPTtrueThreshold> is defined then the value of the compare data point is not used in the
comparison.
The following table lists several case scenarios that show when these two functions might evaluate to
True.
Input 1 Input 2 Input 3 Input 4 Value of Compare Data Point UCPTtrueThreshold Output
50 30 50 50 Does not matter since
<UCPTtrueThreshold> is defined.
40 0.0 0
40 40 40 40 Does not matter since
<UCPTtrueThreshold> is defined.
40 100.0 1
50 50 50 50 50 EMPTY 100.0 1
50 50 50 49 50 EMPTY 0.0 0