ABB RELION REX640 Technical Manual page 303

Protection and control

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1MRS759142 F

Functionality

The real equal comparator function EQR compares the real input REAL_IN1 with the

real input REAL_IN2 and activates the binary output OUT if REAL_IN1 is within the

region of REAL_IN2 + TOLR and REAL_IN2 –TOLR, that is, if REAL_IN1 ≥ (REAL_IN2

– TOLR) and 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.

REAL_IN2+TOLR

REAL_IN2-TOLR

Figure 177: Region of EQR comparison

Table 323: EQR Input signals

Table 324: EQR Output signals

Technical Manual

EQR requires a positive value for TOLR, otherwise it may not function

properly. The TOLR value can be set using SETRGAPC.

EQR function blocks do not have the hysteresis feature. Oscillating

outputs should be avoided when comparing analog signals that have

closely varying values.

Equal region

Output value

Basic functions

Real input 1

Real input 2

Tolerance for compar-