ABB RELION 670 Series Technical Manual page 1100

Section 16
Monitoring
BLOCK
INPUT
RESET
CountType
OnMaxValue
MaxValue
CounterLimit1...4
InitialValue
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.
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.
1094
Operation
Counter
® ®
... Max value -1 Max value
® ®
... Max value -1 Max value
Overflow
Detection
Limit
Check
Error
Detection
®
Max value +1 Max value +2
®
0 1
1MRK 502 066-UUS B
VALUE
OVERFLOW
LIMIT1 ... 4
ERROR
IEC12000625_1_en.vsd
®
Max value +3 ...
®
...
2
IEC12000626_1_en.vsd
Technical manual