Siemens 7SC80 Manual page 566

Technical Data
4.22 User-defined Functions (CFC)
Additional infor- This block is intended for the processing of measured values. As for the COMPARE block, it is allowed
mation that the MaxValSel block is configured at all task levels.
You have to consider that the CFC circuit will only be triggered by the measured values for
processing if the block is located at the task level MW_BEARB. At the other task levels, processing
must be triggered by different events.
If values have not been recorded yet, they will not be considered in the evaluation of the logic.
If all values are interpreted as being identical, no maximum values are returned.
In the following figure, the measured value VAL2 is assumed to be constant, while the measured
value VAL1 varies. The measured value output as maximum value by the CFC block is displayed with
a wide solid line.
Figure 4-15 Example: result of a MaxVal comparison of two input values
Table 4-3
Name
Input HYSVAL1
HYSVAL2
VAL1
VAL2
VAL3
VAL4
VAL5
Output MINVAL
Y1
Y2
Y3
Y4
Y5
Additional infor- Like the CFC block MaxValSel, this block is intended for the processing of measured values. As for
mation the COMPARE block, it is allowed that the MinValSel block is configured at all task levels.
You have to consider, however, that the CFC circuit will only be triggered by the measured values for
processing if the block is located at the task level MW_BEARB. At the other task levels, processing
must be triggered by different events.
If values have not been recorded yet, they will not be considered in the evaluation of the logic.
If all values are interpreted as being identical, no minimum values are returned. In the following
figure, the measured value VAL2 is assumed to be constant, while the measured value VAL1 varies.
The measured value output a
566
With the CFC block MinValSel, you can determine the smallest value from 5 input values
taking into account the hysteresis value 1 (HYSVAL1) and issue it via MINVAL. For the
smallest input value, the respective output Y1 to Y5 is set to "1" taking into account the
hysteresis value 2 (HYSVAL2).
Type
REAL
REAL
REAL
REAL
REAL
REAL
REAL
REAL
BOOL
BOOL
BOOL
BOOL
BOOL
Description
Hysteresis for determining MINVAL
Hysteresis for determining Y1 to Y5
Operand 1
Operand 2
Operand 3
Operand 4
Operand 5
Min value from {VAL1,..,VAL5}
VAL1 = MINVAL +/- HYSVAL2
VAL2 = MINVAL +/- HYSVAL2
VAL3 = MINVAL +/- HYSVAL2
VAL4 = MINVAL +/- HYSVAL2
VAL5 = MINVAL +/- HYSVAL2
E50417-G1140-C486-A8, Edition 07.2017
Default function
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0
0
0
0
0
0
SIPROTEC Compact, 7SC80, Manual