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Hi everyone. Today we will be looking at
testing and wiring PLC digital inputs
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To ensure the proper functioning of any PLC digital
input, it is crucial to correctly test and wire
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the discrete inputs. By understanding the
testing process and providing accurate wiring
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we can guarantee the optimal performance of our
PLC hardware. Testing the inputs allows us to
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verify that they function as intended and that our
wiring connections are secure. This step is essential
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in troubleshooting any potential issues and ensuring
the reliability of our system. Referring to the
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wiring diagram for the input card is important
regarding wiring the inputs. Inputs for the PLC usually
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share a common point for wiring inputs like switches or
sensors. The discrete inputs in our PLC are designed
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for direct current DC and can accept a 24 volt DC
supply. The common point on the input wiring diagram
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can be either plus 24 or 0 volts DC, depending on the
other inputs we are connecting to the PLC. We will test the
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inputs of our Click Plus PLC input module
to ensure they are functioning correctly
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Next, we'll connect a push button to the first PLC
input and a three-wire PNPDC sensor to the second input
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Once the input is activated, 24VC, the corresponding indication light
will turn on, confirming that our discrete PLC input works correctly
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We can also monitor this on our free-click
PLC programming software package
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By following these steps, we can ensure that our
PLC digital inputs are adequately tested and wired
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setting a solid foundation for the functionality of our system. Let's now
dive into the specifics of testing and wiring different types of inputs
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Detailed information contained in this video can be found at
ACCautomation.ca. A link has been put in the description below
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The website offers extensive links, references, and coding samples, making
it a one-stop shop for all your automation queries at ACCautomation.ca
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Testing the PLC Digital Inputs To ensure the proper functioning of our Click Plus PLC it is crucial to test and wire the digital discrete
inputs correctly By understanding the testing process and ensuring accurate wiring we can guarantee the optimal performance of our PLC hardware
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Start by looking at the wiring diagram for the input card,
specifically for our C2-08 DR for VCClick Plus Option Slot module
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You will notice that the discrete inputs are designed
for direct current DC and can accept a 24-volt DC suburb
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The common point on the input wiring diagram can be either plus 24 or
0 volts DC, depending on the other inputs we are connecting to the PLC
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To test the inputs, we need to connect the common point
of the inputs to either the plus 24 or 0 volt DC supply
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Once this is done, we can touch the four input
terminals with the other end of the circuit
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In this setup, our PLC input acts as the load
while we act as the switch for the input
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When the input is activated, the indication light on the
input will illuminate, confirming that our discrete PLED
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PLC input is functioning correctly. By following these steps,
we can ensure that our PLC digital inputs are adequately tested
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and wired, setting a solid foundation
for the functionality of our system
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The following section will explore how to
wire a push button switch to our PLC input
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Wiring a push button switch to our PLC input. Push button switches
come in two configurations, normally open NO and normally closed in C
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The distinction lies in their default state when not pressed. A normally open
switch is open or disconnected when not pressed and closes or connects when pressed
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On the other hand, a normally closed switch is closed or connected
when not pressed, and it opens or disconnects when pressed
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We will follow the wiring diagram to wire
a push button switch to our PLC input
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We will create an electrical circuit loop by
connecting the components in a specific order
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One side of the DC power supply will be
connected to the common point of the PLC input
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The first point of the PLC input will
be connected to one side of the switch
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Finally the other side of the switch will be connected to the other side of the DC power supply completing the circuit By
wiring the push switch in this manner we establish a connection that allows the flow of current when the switch is pressed
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This configuration enables the PLC to detect
the change in state and respond accordingly
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Whether we use a normally open or normally closed switch depends on
our system's specific requirements and the input's desired behavior
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The following section will explore how to
wire a proximity switch to our PLC input
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providing an alternative method for detecting
objects. Wiring a proximity switch to our PLC input
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We will focus on a three-wire proximity sensor
to wire a proximity switch to our PLC input
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specifically the CK1-00-2H. This sensor can detect metallic
and non-metallic objects like liquid, plastic, paper, etc
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When examining this sensor's wiring, diagram, we can wire its output
as either NPN, negative switching, sinking, or PNP positive switching
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sourcing. Since our common PLC input is wired to
zero volts DC, we will wire the sensor as a PNP
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output. In the diagram, our PLC input serves
as the load. The blue wire is connected to the
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zero volt DC supply and wired to our common
for the DC inputs on the PLC. On the other hand
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the black wire acts as the switching wire and
will be connected to the second input of the PLC
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serving as the load. Lastly, the brown wire
is connected to the plus 24 volt DC supply
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It's worth noting that in most three wire DC sensors,
we need to wire in a power supply to provide the
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necessary power for the sensor to function. In
contrast, our push button switch utilizes the operator's
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power to press the button. Following this wiring
configuration, we establish a connection that
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allows the proximity switch to detect objects and
send the corresponding signal to the PLC input
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This enables the PLC to respond accordingly based on the detected object.
This article has covered the testing and wiring of PLC digital inputs
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We discussed wiring a proximity switch to our PLC input specifically focusing on a three proximity
sensor the CK1 sensor We learned that this sensor can detect both metallic and non objects
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We could wire its output as NPN or
PNP when wiring the proximity switch
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We chose to wire it as a PNP output since our
common PLC input is wired to zero volts DC
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We examined the wiring diagram and
connected the proximity sensor to the PLC
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Understanding how to test and wire PLC digital inputs is crucial
for ensuring the proper functioning of industrial automation systems
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Following the guidelines and wiring diagrams, you can confidently integrate
various input devices into your PLC system and enhance its overall performance
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