Real Not Equal Comparator Ner - ABB RELION REX640 Technical Manual

Basic functions
3.22.6

Real not equal comparator NER

3.22.6.1 Function block
Figure 178: Function block
3.22.6.2 Functionality
The real not equal comparator function NER compares the real input REAL_IN1 with
the real input REAL_IN2 and activates the binary output OUT if REAL_IN1 is outside
the region of REAL_INT2 + TOLR and REAL_IN2 - TOLR. That is, if REAL_IN1<
(REAL_IN2 - TOLR) or REAL_IN1 > (REAL_IN2 + TOLR), OUT= 1, else OUT = 0.
If inputs REAL_IN1 or REAL_IN2 are outside the range, then OUT is set to 0.
Max 2097151.000
REAL_IN2+TOLR
REAL_IN2
REAL_IN2-TOLR
Min -2097152.000
Figure 179: Region of NER comparison
304
Not equal region
Not equal region
NER requires a positive value for TOLR, otherwise it may not function
properly. The TOLR value can be set using SETRGAPC.
NER function blocks do not have the hysteresis feature. Oscillating
outputs should be avoided when comparing analog signals that have
closely varying values.
1MRS759142 F
REX640
Technical Manual