ABB REL 551-C1*2.5 - Exclusive or Function Block (XO); Set-Reset Function Block (SR)

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Configurable logic blocks (CL1) Chapter 3
Common functions
6.9 Exclusive OR function block (XO)
The exclusive OR function XOR is used to generate combinatory expressions with boolean vari-
ables. The function block XOR has two inputs and two outputs. One of the outputs is inverted.
The output signal is 1 if the input signals are different and 0 if they are equal.
Table 52: Input signals for the XOR (XOnn-) function block
Path in local HMI: ServiceReport/Functions/XORn
Table 53: Output signals for the XOR (XOnn-) function block
6.10 Set-reset function block (SR)
The Set-Reset (SR) function is a flip-flop that can set or reset an output from two inputs respec-
tively. Each SR function block has two outputs, where one is inverted.
Table 54: Input signals for the SR (SRnn-) function block
Path in local HMI: ServiceReport/Functions/SR
Signal Description
INPUT1 Input 1 to XOR gate
INPUT2 Input 2 to XOR gate
Signal Description
OUT Output from XOR gate
NOUT Inverted output from XOR gate
xx00000165.vsd
XO01-
XOR
INPUT1
INPUT2
OUT
NOUT
Signal Description
SET Input to SR flip-flop
RESET Input to SR flip-flop
xx00000166.vsd
SR01-
SR
SET
RESET
OUT
NOUT