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12. Appendix
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12. Appendix
12.1 Example of Faulty Circuit
Wrong configurations of circuits are shown below. Correct the circuitry, if any.
Faulty circuit producing errors
Correct circuit
(1) Circuit containing OR
(2) Rounding circuit
Y11
Y10
X4
X3
X2
X1
Whether or not the Y10 condition includes X3, X4
and X2 is unknown.
Necessity
Y11
Y10
X4
X3X2
X1
X4X3
X2
X1
(3) Modification of loopback circuit
0
0
0
1
1
0
(4) Presence of a contact before RET, FEND,
or MCR circuit
RET
RET