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10. PLC Help Function
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(2) Three-point switch
(Example)
When three opposite switches 17, 18, and 19 are provided;
Y170
Y171
SET M3
SM96
RST M3
SET M4
SM97
RST M4
X150
SET M5
X151
X150
X151
When SM96 turns on,
X150 turns off.
RST M4
RST M3
X152
X150
X151
X152
RST M5
M3
X150
X151
X150 X151X152
X150 X151 X152
M4
X150 X151 X152
X152
Y172
SM98
RST M5
X150 X151X152
M5
X150 X151 X152
X150 X151X152
When SM97 turns on,
X151 turns off.
When SM98 turns on,
X152 turns off.
X152