ABB Relion 670 series - Page 1100

BLOCK
CountType
INPUT
RESET
ERROR
OVERFLOW
LIMIT1 … 4
CounterLimit1...4
MaxValue
OnMaxValue
InitialValue
VALUE
Operation
Counter
Overflow
Detection
Limit
Check
Error
Detection
IEC12000625_1_en.vsd
IEC12000625 V1 EN-US
Figure 568: 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
569.
IEC12000626_1_en.vsd
Max value +3
®
Max value -1
®
Max value
®
Max value +1
®
Max value +2
®
Max value -1
®
Max value
®
0
®
1 2
...
...
...
...
Overflow indication
Actual value
Counted value
IEC12000626 V1 EN-US
Figure 569: Overflow indication when OnMaxValue is set to rollover pulsed
The Error output is activated as an indicator of setting the counter limits and/or initial value
setting(s) greater than the maximum value. The counter stops counting the input and all the
outputs except the error output remains at zero state. The error condition remains until the
correct settings for counter limits and/or initial value setting(s) are applied.
The function can be blocked through a block input. During the block time, input is not counted and
outputs remain in their previous states. However, the counter can be initialized after reset of the
function. In this case the outputs remain in their initial states until the release of the block input.
Section 16 1MRK 502 066-UUS B
Monitoring
1094
Technical manual