ABB Relion Technical Manual page 548

Section 14
Monitoring
542
BLOCK
INPUT
RESET
CountType
OnMaxValue
MaxValue
CounterLimit1...4
InitialValue
IEC12000625 V1 EN
Figure 248: Logic diagram
The counter can be initialized to count from a settable non-zero value after reset of the
function. The function has also a maximum counted value check. The three possibilities
after reaching the maximum counted value are:
• Stops counting and activates a steady overflow indication for the next count
• Rolls over to zero and activates a steady overflow indication for the next count
• Rolls over to zero and activates a pulsed overflow indication for the next count
The pulsed overflow output lasts up to the first count after rolling over to zero, as
illustrated in figure 249.
Overflow indication
Actual value ... Max value -1
Counted value
... Max value -1
IEC12000626 V1 EN
Figure 249: Overflow indication when OnMaxValue is set to rollover pulsed
Operation
Counter
® ®
Max value Max value +1
® ®
Max value
1MRK 502 048-UUS A
Overflow
OVERFLOW
Detection
LIMIT1 ... 4
Limit
Check
Error
Detection
IEC12000625_1_en.vsd
®
®
Max value +2
® ®
0 1
IEC12000626_1_en.vsd
VALUE
ERROR
Max value +3 ...
...
2
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