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Table 9.8 OR logic truth table
B0 B1 B2
FALSE FALSE FALSE
FALSE TRUE TRUE
TRUE FALSE TRUE
TRUE TRUE TRUE
OR logic example
When an over-voltage or under-voltage is detected, a warning light is activated.
NOT
One normally closed contact. The output of a normally open coil will always be the opposite of the input of the contact.
Figure 9.8 NOT ladder logic diagram
Table 9.9 NOT logic truth table
B0 B1
FALSE TRUE
TRUE FALSE
NOT logic example
When a ready light is deactivated, a not ready light is activated.
NAND
Two normally closed contacts connected in parallel. This operation is the opposite of the AND operation. The output of a
normally open coil is TRUE, until the input both normally closed contacts are TRUE. This logic can be extended to be used
with more than two normally open contacts in parallel.
PPM 300 PICUS manual 4189341080 UK
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