Hitachi PLC - Page 19

18
& De Morgan’s Laws
NOT ( A AND B ) = ( NOT A ) OR ( NOT B ) A × B = A + B
NOT ( A OR B ) = ( NOT A ) AND ( NOT B ) A + B = A × B
X0
Y100
Edge detection (
á
) : DIF
X0 Y100DIF 0
1 scan time
X0
Y100
Edge detection (
â
) : DFN
X0 Y100DFN 0
1 scan time
X0
X1
Set/Reset coil
X0 Y100
S
X1 Y100
R
Y100
X0 Y100
X0
Y100
AND
X1
X1
X0 Y100
X0
Y100
OR
X1
X1
Internal memory R, M can be used instead of X and Y.
X0 Y100
X0
Y100
NOT