PLC midterms

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Binary codes decimal

Each 4 bits of binary numbers are grouped to form a decimal number

Firmware

Software that resides in the rom

Full and half duplex

Two types of DF1 communications

Parity

____ check is used to find transmission errors

Exit status

Not a section of system memory

Location status

Not section of system memory

Central processing unit

CPU

Remotely controlled

Not one of the 3 types of PLC programming modules

Quotient

Number of times the divisor can be subtracted from the dividend

Octal

Number system has a base of eight

Permeability

One of the following factors is not necessary when selecting PLC

Gray code

Only one digit changes state as a number increments or decrements

External processing unit

PLC contains all of the following except

Data communication equipememt

Respond to the messages transmitted by the data terminal equipment

Small logix controller

SLC

Internal flip flop

SRAM uses a ______ to hold a data bit

Flip flop

Sequential digital device that generates a different output for every input on the next clock pulse

Real

Type of number has weights that are both positive and negative powers of 10

Fractional

Type of number has weights that are negative powers of ten

Integer

Type of number has weights that are positive powers of ten

Ultraviolet erasable programmable ROM

UVEPROM

Optoisolator

Used to input the D.C. Signal to the CPU board

Electrically erasable programmable rom

EEPROM

Two way

Full duplex DF1 allows for ______ communications between two devices

255

Half duplex DF1 allows for communications in one direction at a time in a network of up to ______ devices

Data terminal equipment

Initiates communication by sending messages

Sourcing

Sinking input device must be connected to a _______ input module port

Ladder logic program

The user memory segment holds the ________ whereas the system memory segment stores information needed to execute the user program

Basic input output system

BIOS

Most significant bit

Binary digit to the far left hand side of the number

Least significant bit

Binary digit to the far right hand side of the number

Digital to analog converter

Converts digital output signals back to analog signals

Digital to analog converter

Digital, or variable, output modules use _____ ICs to convert digital data supplied by the PLC processors to scalable voltage or current

Zener

Diode is a semiconductor device that can maintain a steady level of voltage

Address decoder curcuit

Ensures that only one device is communicating with the microprocessor at any given moment

Robotics configuration

Least important consideration when selecting PLC

Address decoder

MPU uses a _______ to enable rom, ram, I/o port devices, and support chips

Cache

MPU uses_______memory to speed up the data transfer while it is executing a program

RISC-based

Microprocessors typically uses only one instruction for a complex command

CISC-based

Microprocessors uses several math instructions to carry out complex commands

Sinking

Sourcing output device must be connected to an ______ output module port

Hexadecimal

System used to display the PLC memory map and to carry out math instructions

Baud rate

The unit of transmission for measuring the speed of communication

Modular PLC

The housing consists of a power supply and chassis with several slots

Fixed PLC

The processor, power supply, and I/o modules are all in one housing


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