What is the definition of "alphanumeric key"?
A key on a hand-held programmer that contains numerals 0 through 9 and letters A through Z. These keys allow you to enter values and characters into a program.

Learn more about alphanumeric key in the class Hand-Held Programmers of PLCs 280 below.


PLCs Training


Class Information
PLCs Training Tooling U-SME 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:Hand-Held Programmers of PLCs 280
Description:This class covers the basic functions and characteristics of hand-held programmers. Includes an Interactive Lab.
Prerequisites: none
Difficulty:Intermediate
Number of Lessons:13
Language:English, Spanish
 
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Class Outline
  • Objectives
  • Hand-Held Programmers for PLCs
  • Pros and Cons of Hand-Held Programmers
  • Hand-Held Programmer Applications
  • Dumb Terminals and Smart Terminals
  • Hand-Held Programmer Hardware
  • The Hand-Held Programmer Keypad
  • Hand-Held Programmer Modes
  • Hand-Held Programmer Start-Up
  • Using the Hand-Held Programmer
  • Hand-Held Programmer Instruction Lists
  • Error Messages
  • Summary
  
Class Objectives
  • Describe hand-held programmers.
  • Describe the advantages and disadvantages of hand-held programmers.
  • Describe hand-held programmer applications.
  • Distinguish between dumb terminals and smart terminals.
  • Describe hand-held programmer hardware.
  • Describe the hand-held programmer keypad.
  • Describe hand-held programmer modes.
  • Explain how to start-up a hand-held programmer.
  • Describe general practices for using a hand-held programmer.
  • Describe hand-held programmer instruction lists.
  • Describe hand-held programmer error messages.

Class Vocabulary

Vocabulary TermDefinition
advisory message A message following the error code to help you quickly identify the error. In the case of the MicroLogix HHP, the error code 0001 is followed by the advisory message HARDWARE FAILURE.
alphanumeric key A key on a hand-held programmer that contains numerals 0 through 9 and letters A through Z. These keys allow you to enter values and characters into a program.
communication cable The means by which data travels through a network. Typically this is some type of cable, although wireless networks are becoming increasingly common.
configure To arrange the settings for a piece of equipment or software.
cursor A blinking character on a display screen that indicates the current input location.
D2-HP A brand of hand-held programmer manufactured by AutomationDirect.
debug To test a PLC for errors.
diagnostic A set of computer instructions that investigates or analyzes the cause or nature of errors or failures in the PLC.
display screen The area on a hand-held programmer that allows you to view programs, menu items, and messages.
download To transfer data from another device to your device. Hand-held programmers can download information from a PLC.
dumb terminal A hand-held programmer that simply acts as keyboard and monitor for the PLC. Dumb terminals have no intelligence or memory of their own.
editing key A key on a hand-held programmer that allows you to make changes to data in the HHP.
electrostatic discharge A discharge of static electricity that can potentially cause injury or damage components. Also known as ESD.
error log A file in the memory of the CPU that tracks errors and failures encountered by the PLC system.
error message A warning displayed on the HHP display screen that alerts you to a problem with the PLC system.
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.
hand-held terminal A PLC programming device that combines a display screen and keypad all in one unit. Specially assigned keys allow you to enter program instructions, make changes, and navigate and troubleshoot the PLC system.
instruction key A key on a hand-held programmer that allows you to select and enter instructions
instruction list A set of commands used by a hand-held programmer to represent a ladder program. Instruction lists use mnemonic codes as a substitute for more traditional ladder diagrams.
integrated circuit A miniaturized electrical network used to transmit electric power. Integrated circuits are used for memory in PLC processors to store programs and data.
interface A hardware device that connects two separate pieces of equipment. RS-232 cable can be used as an interface between a hand-held programmer and a PLC.
keypad A set of buttons used for entering information and instructions into a hand-held programmer.
ladder diagram Another name for a line diagram, due to its resemblance to a ladder. In this sense, each circuit line is a "rung" of the ladder.
LCD screen Liquid crystal display screen. The area on a hand-held programmer that allows you to view programs, menu items, and messages.
LED Light emitting diode. A semiconductor device that emits a narrow-spectrum of light in a forward direction.
memory card An integrated circuit that stores data. Also known as a memory chip or memory.
memory chip An integrated circuit that stores data. Also known as a memory card or memory.
mnemonic A symbol or expression that is easy to remember. Mnemonics are used in HHP instruction lists.
mode One of a number of possible settings used by a hand-held programmer to run certain operations such as programming or testing.
navigation key A key on a hand-held programmer that allows you to scroll up, down, and sideways on the display screen.
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.
operation key A key on a hand-held programmer that allows you to perform different tasks such as configuration and diagnostics.
overwrite To erase existing data by replacing it with new data.
personal computer A small, single-user computer. Also known as a PC.
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 and devices.
RS-232 An older type of communications cable used for connecting peripheral devices to a computer.
RS-442 A communications cable that transmits at faster rates than RS-232 and over longer distances. However, RS-442 is not commonly used.
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.
rung The horizontal programming lines in ladder logic. Each rung controls one output.
sequence The order in which keys are pressed. Key sequences are used to issue commands and instructions.
smart terminal A hand-held programmer that can store programs and can function independent of a PLC.
stand-alone terminal Another name for a smart terminal. A smart terminal is a hand-held programmer that can store programs and can function independent of a PLC.
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.
upload To transfer data from one device to another device. Hand-held programmers can upload information to a PLC.
user manual A document created by the manufacturer of a device that provides detailed installation and operation instructions.