7.6.1 Basic Programming Elements
The basic programming elements are the contacts, coils, and connectors
shown below:
7.6.1 .l Normally Open Contact
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The normally open contact is the basic logic element point used in ladder
logic diagrams. The logic element is controlled by a discrete input
(reference number 10Xx) or by a coil (reference number 00Xx).
7.6.1.2 Normally Closed Contact
The normally closed contact is controlled the same way as a normally open
contact.
7.6.1.3 Coil
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The coil (reference number 00Xx) is the discrete output from ladder logic.
A coil is used either to provide the control signal for an external discrete
device (solenoid, motor starter, indicator lamp, etc.) and/or as the input for
an internal contact. A coil can be programmed only once as a discrete
output. Once programmed, it can be referred to as many times as desired
as an internal contact.
More than one coil (unlatched or latched) can appear on a single rung. Each
coil on a rung is treated as if it were connected to the right rail of the
network. Therefore,
is programmed in the MICRO 84 as:
7-5
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