What is the definition of "micro PLC"?
An extremely compact fixed PLC with block I/O.

Learn more about micro PLC in the class Hardware for PLCs 210 below.


PLCs Training


Class Information
Tooling U classes are offered at the beginner, intermediate, and advanced levels. The typical class consists of 12 to 25 lessons and will take approximately one hour to complete.
Class Name:Hardware for PLCs 210
Description:This class covers the characteristics and functions of different types of PLC hardware, and provides basic troubleshooting procedures and maintenance tips. Includes an Interactive Lab.
Prerequisites: 450200 
Difficulty:Intermediate
Number of Lessons:15
Language:English, Spanish

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Below are all the competencies and job programs that contain the class Hardware for PLCs 210. Job programs are our traditional class lists organized according to common job functions. Competencies are our latest job-specific curricula that help tie online learning to practical, hands-on tasks.

Click on any title to view its details.

Competencies


Class Outline
  • Objectives
  • PLC Hardware
  • Fixed PLC Configuration
  • Modular PLC Configuration
  • Power Supply
  • Central Processing Unit
  • CPU Memory
  • Input/Output Modules
  • Programming Device
  • Indicator Lamps
  • Optional PLC Hardware
  • PLC Networks
  • PLC Hardware Installation and Maintenance
  • Troubleshooting Errors
  • Summary
  
Class Objectives
  • Define PLC hardware.
  • Describe fixed PLC configuration.
  • Describe modular PLC configuration.
  • Describe PLC power supply.
  • Describe the PLC central processing unit.
  • Differentiate between types of CPU memory.
  • Describe PLC input/output modules.
  • Describe PLC programming devices.
  • Describe PLC indicator lamps.
  • Describe optional PLC hardware.
  • Describe PLC communication networks.
  • Describe PLC hardware installation and maintenance.
  • Describe how to troubleshoot PLC error messages.

Class Vocabulary

Vocabulary TermDefinition
address The unique location assigned to each I/O module so that it may be correctly referenced and signaled by the PLC program.
backup battery A battery inside the CPU that protects the system from data loss in the case of power failure. The operating life of lithium backup batteries is 3 to 5 years.
battery low An indicator lamp on a PLC that indicates the battery is low on power and needs to be recharged or replaced.
bit A single numerical unit in the binary number system. Bit is short for "binary digit."
block I/O A smaller type of PLC that is a self-contained box. A block I/O PLC has fewer input and output modules.
central processing unit The the main device that processes information and carries out instructions in a PLC. Also known as the CPU, processor, or controller.
configuration The specific combination of components used to create a PLC system. The two main types of PLC configuration are block I/O and rack I/O.
controller The main device that processes information and carries out instructions in a PLC. Also known as the CPU, or processor.
CPU Central Processing Unit. The main device that processes information and carries out instructions in a PLC. Also known as the processor or controller.
diagnostic routine A set of computer instructions for investigating or analyzing the cause or nature of errors or failures in the PLC. The two main types of PLC errors are fatal and non-fatal.
digital Consisting of information that is input or output electronically as a series of pulses or signals either "on" or "off," often resulting in binary strings of 0s and 1s.
DIN rail A metal track or rail to which PLCs and other motor control devices can be easily attached or removed.
disable An operational switch on a PLC that makes outputs inoperable or forces them off.
discrete A signal that has two states, ON and OFF.
electrical noise An AC power line disturbance caused by sudden changes in the load. Electrical noise is problematic to solid state devices because they cannot differentiate between an intended electrical pulse and an unintended electrical spike.
electrostatic discharge A discharge of static electricity that can potentially cause injury or damage components while soldering. Also known as ESD.
EPROM Erasable Programmable Read Only Memory. A secure area in which programs are protected from unauthorized changes. EPROM can be read, but it is difficult to change.
erasable programmable read only memory A secure area in which programs are protected from unauthorized changes. EPROM can be read, but it is difficult to change.
fatal error An error that prevents the PLC system from functioning. Fatal errors are usually caused by major programming errors or hardware problems.
fault An indicator lamp on a PLC that lights up when there is an error in the PLC system. The PLC will typically de-energize all outputs when this LED is activated.
fixed PLC Fixed PLCs combine all of the main components into a single unit that contains the CPU, input/output sections, and power supply. The number of inputs and outputs cannot be expanded.
force I/O An indicator lamp on a PLC that indicates when the inputs and outputs are being forced on and off by the PLC program.
hand-held programmer A PLC programming device that combines a display screen and keypad all in one unit. Specially assigned keys allow you to enter program instructions, changes, and navigate and troubleshoot the PLC system.
hardware Hardware is the physical equipment used in a computer system. PLC hardware includes the CPU, power supply, input/output section, and programming device.
human-machine interface A communication device, typically a touchscreen or screen and keypad, between a computer system and a person. Also known as man-machine interface.
I/O module The jack where an input/output device is physically connected to a PLC. The input relays transfer signals to the internal relays. The output relays signals to external output devices.
IC chip A miniaturized electrical network used to transmit electric power. A microchip is an example of an integrated circuit, or IC.
indicator lamp A light-emitting diode on a PLC that provides information on the operating condition of various parts of the PLC. Indicator lamps are used to show the status of inputs, outputs, and the operating conditions of the CPU.
input module The jack where an input device is physically connected to a PLC. The input modules transfer signals to the internal relays.
LAN Local Area Network. A communications network that connects computers and their devices together over a relatively short distance, such as the same room or the same building.
LED Light Emitting Diode. A semiconductor device that emits a narrow-spectrum of light in a forward direction.
light-emitting diode A semiconductor device that emits a narrow-spectrum of light in a forward direction. Also known as an LED.
linear power A type of AC power supply that uses a transformer to convert the AC to a lower voltage. Linear power supply has a very smooth voltage.
local area network A communications network that connects computers and their devices together over a relatively short distance, such as the same room or the same building. Also known as a LAN.
magnetic backup An outdated computer backup system used to store data onto magnetic tape.
master-slave relationship A computer networking communication protocol in which one device or process controls one or more other devices. In a PLC network, the CPU acts as the master, initiating and controlling all communications to the remote I/Os.
memory The place in a computer where information is held in storage for the CPU. Storage can be built into the CPU in the form of RAM, or it can be remote from the CPU in the form of hard disks, tapes, or other storage media.
memory size The amount of information that can be stored in a memory chip. 1 kilobyte of computer memory = 1,024 bits.
micro PLC An extremely compact fixed PLC with block I/O.
modular PLC A PLC configuration in which each component is split into a separate unit. A modular PLC lets you have as many inputs and outputs as you want.
module The physical connection on a PLC where an input or output is plugged in.
multiplexing A type of wiring that allows multiple signals to be processed through a single channel. Multiplexing is used to save on wiring and I/O ports.
noise An AC power line disturbance caused by sudden changes in the load. Electrical noise is problematic to solid state devices because they cannot differentiate between an intended electrical pulse and an unintended electrical spike.
non-fatal error An error that will not interfere with the basic operation of the PLC.
nonvolatile Nonvolatile computer memory preserves any data it contains in the event of a power loss. ROM and EPROM are examples of nonvolatile memory.
off A control switch that prevents the PLC system from being run or programmed.
offline An operational mode in which a PLC is not accepting inputs.
online An operational mode in which a PLC is connected to the system network and ready to accept inputs.
output module The jack where an output device is physically connected to a PLC. The output modules transfer signals from the internal relays.
peer-to-peer relationship A computer networking communication protocol that gives all devices equal ability to send information to other devices.
peripheral device A piece of hardware that is not part of the main PLC system, but provides inputs and accepts outputs from the PLC.
personal computer A small, single-user computer. Also known as a PC.
PLC Programmable Logic Controller. A processor driven device that uses logic based software to provide electrical control to machines.
power An indicator light on a PLC that indicates the PLC has been turned on. This light should always be on when the PLC is operating.
power cycling Turning a computer off and then turning it back on. Power cycling is usually done to clear PLC errors.
power supply A separate power source for a PLC that converts the standard incoming 120VAC to the low voltage DC that the CPU requires, usually around 5V.
printer A device that outputs the data on a computer screen to a sheet of paper.
processor The main device that processes information and carries out instructions in a PLC. Also known as the CPU or controller.
program mode An operational mode of the CPU of a PLC that is used for monitoring and changing the PLC program.
programmable logic controller A processor-driven device that uses logic based software to provide electrical control to machines.
programming device A device, usually a personal computer, used to enter instructions into the PLC. Some programming devices are small enough to fit in your hand.
proprietary network A PLC network designed by a manufacturer for a specific brand of PLCs.
protocol The language spoken between computers to help them exchange information.
rack An enclosure with slots in it that is to connect multiple parts of a PLC.
rack I/O A larger type of PLC that is a collection of I/O cards that are linked together and stored in a rack. A rack I/O can handle thousands of inputs and outputs.
RAM Random Access Memory. A temporary storage area in which data can be immediately stored and accessed. RAM is also called read/write memory.
random access memory A temporary storage area in which data can be immediately stored and accessed. RAM is also called read/write memory.
read only memory Stores data that can be read but not written to or changed. Typically, this data is the program that runs the PLC.
recorder/player A device used for storing computer data in a different area or medium than the CPU.
remote I/O Input/output modules that are located far away from the CPU of the PLC.
remote I/O network A type of communications network created by PLC manufacturers to support input/output devices that are located far away from the CPU of the PLC.
ROM Read Only Memory. Stores data that can be read but not written to or changed. Typically, this data is the program that runs the PLC.
run An operational switch on the CPU that allows the system to run, but no changes can be made to the program.
run mode An operational mode of the CPU of a PLC that allows the system to run, but no changes can be made to the program.
software key A software key is a number or a code you enter on a keypad order to access functions on the PLC. Software keys are rapidly replacing physical keys.
stand-alone device A device, typically a computer, that is not permanently connected to a communications network.
switching power A digital power supply. Digital information is input or output electronically as a series of pulses or signals either "on" or "off," often resulting in binary strings of 0s and 1s.
test mode An operational mode of the CPU of a PLC that checks if inputs and outputs are working without actually energizing the input/output circuits or devices.
volatile Volatile computer memory loses any stored information when power is removed from the CPU. RAM is an example of volatile memory.
voltage spike A sudden, short surge in voltage. Voltage spikes can be caused by lightning, power outages, short circuits, or power transitions in large equipment on the same power line.