478 terms ch 05
Card Set Information
478 terms ch 05
the part of a total system memory
devoted to storing the application program and its associated data.
the part of the processor's memory, containing
I/O values and files, where data is monitored, manipulated, and changed for
of nonvolatile, programmable, read only memory that can be erased completely by
applying the proper voltage to the memory chip.
Electrically alterable read-only memory (EAROM)
a type of nonvolatile, programmable, read-only memory that can be erased by
Electrically erasable programmable read-only memory (EEPROM)
a type of
nonvolatile, programmable, read-only memory that can be erased with ultraviolet
Erasable programmable read-only memory (EPROM)
the part of the system memory that
permanently store system’s supervisory programs, as well as instruction
software; not accessible to the user.
the area of a PLC’s memory where information
about the status of input devices and stored.
the part of the programmable controller that stores
data, instructions, and the control program either temporarily or semi-permanently.
a diagram showing the system's memory
addresses, as well as which programs and data are assigned to each section of
a type of memory whose contents are not
lost or disturbed if operating power is lost.
the area of a PLCs memory where information
about the status of output devices stored.
a read only memory
that can be programmed once and never altered again.
Programmable read-only memory (PROM)
a volatile, alterable memory
that provides storage for the application program and data.
Random-access memory (RAM)
a type of memory that permanently
stores and unalterable program or set of instructions.
Read-only memory (ROM) –
a temporary storage area used by the
CPU to store a relatively small amount of data used for interim calculations or
Scratch pad memory –
the area of a PLCs memory that stores blocks
of input/output data, as well as data about the status of internal bits.
Storage area –
the memory section where the
application control program is stored.
User program memory –
a type of memory whose contents are
irretrievable after operating power is lost.
Volatile memory –