Design - ABB RES670 Technical Manual

Section 16
Monitoring
16.9.3.1
586

Design

Figure 231 illustrates the general logic diagram of the function.
BLOCK
INPUT
RESET
CountType
OnMaxValue
MaxValue
CounterLimit1...4
InitialValue
IEC12000625 V1 EN-US
Figure 231: 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 232.
Operation
Counter
Overflow
Detection
Limit
Check
Error
Detection
Phasor measurement unit RES670 2.2 ANSI
1MRK 511 408-UUS A
GUID-B643C994-D0BA-4BE9-BACB-ADEA0197CAE4 v1
VALUE
OVERFLOW
LIMIT1 ... 4
ERROR
IEC12000625_1_en.vsd
Technical manual