PLC chapter 4

the smallest unit of memory, that always stores a binary 1 or binary 0

a nonvolatile memory that combines both RAM and EEPROM technologies

the part of the CPU that provides storage for user-generated programs and data

a memory type that loses its programmed contents if all operating or backup power is lost or removed

a memory, that cannot be modified without first erasing it using an ultraviolet light eraser

this read/write memory the most common in PLCs is volatile and requires battery-backup

memories of this type retain their programmed contents even if all operating or backup power is lost

a nonvolatile memory type that can be electronically erased and reprogrammed

a memory unit composed of eight bits. this unit of memory may hold eight status bits or be treated as a group to hold a numeric value or code

a unit fro measuring or specifying the amount of memory - equivalent to 1024 locations

a memory unit composed of sixteen bits. This unit of memory may hold 16 individual status bits or be treated as a group to hold a numeric value or code

name given to memory organized in sixteen-bit storage locations

name given to memory organized in eight-bit storage locations

application memory area allocated to storing ON/OFF status of connected discrete inputs

bit storage locations that contain program generated discrete signals, not tied to real outputs

application memory area allocated to storing ON/OFF status of connected discrete outputs

application memory area used to hold variable and constant data associated with the process

user-generated instructions that governs the operations of the controlled machine or process

a device used to clear the contents of an EPROM type of memory

numbers used t reference each bit, byte or word location in memory

detailed outline of how a particular CPU's application memory is arranged and utilized