Omron CPM1

504
Glossary
positive delay A delay set for a data trace in which recording data begins after the trace signal
by a specified amount.
Power Supply Unit A Unit that connected to a PC that provides power at the voltage required by the
other Units.
present value The current value registered in a device at any instant during its operation.
Present value is abbreviated as PV. The use of this term is generally restricted
to timers and counters.
printed circuit board A board onto which electrical circuits are printed for mounting into a computer or
electrical device.
PROGRAM mode A mode of operation that allows inputting and debugging of programs to be car-
ried out, but that does not permit normal execution of the program.
Programmable Controller A computerized device that can accept inputs from external devices and gener-
ate outputs to external devices according to a program held in memory. Pro-
grammable Controllers are used to automate control of external devices.
Although single-unit Programmable Controllers are available, building-block
Programmable Controllers are constructed from separate components. Such
Programmable Controllers are formed only when enough of these separate
components are assembled to form a functional assembly.
programmed alarm An alarm given as a result of execution of an instruction designed to generate
the alarm in the program, as opposed to one generated by the system.
programmed error An error arising as a result of the execution of an instruction designed to gener-
ate the error in the program, as opposed to one generated by the system.
programmed message A message generated as a result of execution of an instruction designed to gen-
erate the message in the program, as opposed to one generated by the system.
Programming Console The portable form of Programming Device for a PC.
Programming Device A Peripheral Device used to input a program into a PC or to alter or monitor a
program already held in the PC. There are dedicated programming devices,
such as Programming Consoles, and there are non-dedicated devices, such as
a host computer.
PROM Programmable read-only memory; a type of ROM into which the program or data
may be written after manufacture, by a customer, but which is fixed from that
time on.
prompt A message or symbol that appears on a display to request input from the oper-
ator.
protocol The parameters and procedures that are standardized to enable two devices to
communicate or to enable a programmer or operator to communicate with a de-
vice.
PV See present value.
RAM Random access memory; a data storage media. RAM will not retain data when
power is disconnected.
RAS An acronym for reliability, assurance, safety.
read-only area A memory area from which the user can read status but to which data cannot be
written.