PLC midterms
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
