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We will be wiring discrete
inputs and outputs to an XGB PLC
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This will be the lighted pushbuttons start and stop. In industrial automation,
programmable logic controllers, or PLCs, are critical in controlling
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various machines and processes. One of the most widely used
PLCs is the LS Electric XGB series, which is known for its
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reliability and flexibility. We will focus on wiring discrete
inputs and outputs to an LS Electric XGB PLC, providing
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insights and tips for successful implementation. Using the XG5000
programming software, we will connect to the XGB PLC and monitor the
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physical input locations. Turning on and off the outputs
and viewing the inputs will test our wiring and ensure
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we understand the addresses involved. Let's get started. Detailed
information contained in this video can be found at accautomation.ca
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A link has been put in the description below. If you have not watched
the other videos yet, there will be links in the description below
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that will start you at video 1. There will be links
to the rest of the videos in the series as well
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Using ferrules for stranded wiring. When physically
wiring inputs to PLCs, often these are screw terminals
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Using a ferrule when using stranded wire ensures a good connection.
Ferrules are any tube used to bind together strands of material together
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In the case of wire ferrules, this tube is
crimped to ensure that all wire strands are
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kept together. Strip off the end of the wire and
place a ferrule on the end, ensuring that all the
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wire strands are in the tube. Use the
crimping tool to crimp the ferrule tube
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Discrete inputs. Using sensors and switches, discrete
inputs interface the PLC with various digital sensors
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and switches such as limit switches, push buttons, and proximity sensors. These
inputs are critical for monitoring the status of different devices and signaling
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the PLC to take appropriate action. When wiring discrete inputs
to an LS Electric XGB PLC, following a few steps is essential
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to ensuring proper functionality. First and foremost, selecting
the correct input type with the LS Electric XGB PLC is critical
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DC or direct current inputs on the CPU can be
wired with the common point at 0VDC, syncing
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or 24VDC, sourcing. In our case, we will be wiring
the common at 0VDC for our inputs and outputs
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Follow the wiring diagram provided by the manufacturer. It's critical to
pay attention to the polarity and voltage specifications when making the
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connections to prevent damage to the PLC or the connected
devices. The onboard I.O. of the XGB PLC requires 24VDC power
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Check the power according to the manufacturer's wiring diagram. We can now
wire the push buttons to the PLC input, starting with the 24V signal wire
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We will wire the normally open, and O of the
green switch, and the normally closed, and
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C of the red switch. One side of the lamp
will also be wired to the 24V signal
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The other side of the normally closed green
switch will be wired to the first input, IX0
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which we will be using a yellow wire. The other side of the
normally closed red switch will be wired to the second input
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IX1, which we will be using the red wire. The XGB series offers a
variety of input modules with different voltage and current ratings
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to accommodate diverse industrial applications. These
modules or cards can be added to your PLC system
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Labeling the input terminals and documentation
of the wire scheme can greatly facilitate
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troubleshooting and maintenance activities in the future. Since this is just
for testing, we are using different colored wires so you can see the connections
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Discrete Outputs Discrete outputs control actuators and devices
such as solenoid valves, starter motors, and indicator lamps
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These outputs enable the PLC to activate and
supervise different components of the system
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based on the programmed logic. When wiring discrete outputs
in the LS Electric XGB PLC, it is essential to adhere to best
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practices to ensure safe and reliable operation. Like discrete inputs,
selecting the appropriate output voltage compatible with the LS Electric
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XGB PLC is the first step in the process.
Our CPU outputs on the XGB PLC are syncing
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This means that the common
for the PLC voltage is at 0VDC
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Once again, refer to the manufacturer's wiring diagram. Our
outputs will be the LED lamps with the green and red pushbuttons
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The other contact of the LED lamp for the
green light will be wired to the output QX0
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The other contact of the LED lamp for the
red light will be wired to the output QX1
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with a black wire. Our wiring
is complete. Power up the PLC
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You will notice that the input 1 is on. This is because it is
wired to the normally closed contact of the red pushbutton
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If no one is touching the switch, the
signal is 1, high, or on at the PLC
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The XGB series offers output modules with
different current and voltage ratings to meet
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the requirements of different actuating devices.
These modules or cards can be added to your PLC system
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Labeling the output terminals and documentation
of the wiring scheme can greatly facilitate
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troubleshooting and maintenance activities in the future. Since this is just
for testing, we are using different colors so you can see the connections
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It is also essential to ensure that the connected
devices stay within the current capabilities
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of the output module to prevent overloading
and potential damage. Testing wiring
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Ringing out the inputs and outputs. Testing is the next
step once the inputs and outputs are wired to the PLC
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This is sometimes referred to as ringing out the I.O.
Start a new project using the XG5000 programming software
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We will place an end statement for our program.
Set the IP address and connect to the XGB PLC
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We have previously covered how this
is accomplished in a previous post
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You will see the status of our PLC connection at
the bottom of the XG5000 programming software
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Green means we are connected, and
the PLC is writing the program
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Red means we are connected, and
the PLC programming is not running
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Write the program to the XGB PLC
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Call up monitor 1 and enter the input contacts
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Activate the monitor icon on the main
screen to view the status of the inputs
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We can now activate the inputs and see
the corresponding bits turn on and off
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Add the two outputs to the monitor 1 window
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Double clicking on the output status
will allow you to turn them on and off
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You will see that our green and red LED outputs
light. This ensures that our LEDs are wired correctly
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General tips and considerations. When wiring discrete inputs
and outputs to an LS Electric XGB PLC, several general tips
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and considerations can enhance the overall
installation and operation. Grounding and shielding
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Proper grounding and shielding techniques should be employed
to minimize electrical noise and ensure signal integrity
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Cable routing and protection. Carefully routing and protecting
the input and output cables to prevent provincial damage
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and interference from external sources. Safety considerations. Following
safety standards and practices is crucial in preventing accidents and ensuring
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a secure working environment. Testing and validation. Through testing and
validation of the wired inputs and outputs, it is essential to guarantee
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proper functionality before integrating them into a more extensive control system.
Wiring discrete inputs and outputs to an LS Electric XGB PLC requires careful planning
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attention to detail, and adherence to best practices. By selecting the
suitable modules, following the provided wiring diagrams and documentation
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and installation, you can ensure reliable and
efficient integration of sensors, switches
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actuators, and devices with the PLC. Proper grounding, cable protection,
and safety measures further contribute to a successful installation
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With these guidelines, you can confidently
wire discrete inputs and outputs to the LS
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Electric XGB PLC for various industrial automation applications.
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