Omron SYSMAC C2000H Operation Manual page 384

self-maintaining bit
servicing
set
set value
shift register
Simplex CPU
Simplex System
Slave
Slave Rack
slot
software error
software protect
source
Special I/O Unit
SR area
subroutine
subroutine number
Glossary
A bit that is programmed to maintain either an OFF or ON status until set or
reset by specified conditions.
The process whereby the PC provides data to or receives data from external
devices or remote I/O Units, or otherwise handles data transactions for Link
Systems.
The process of turning a bit or signal ON.
The value from which a decrementing counter starts counting down or to
which an incrementing counter counts up (i.e., the maximum count), or the
time from which or for which a timer starts timing. Set value is abbreviated
SV.
One or more words in which data is shifted a specified number of units to the
right or left in bit, digit, or word units. In a rotate register, data shifted out one
end is shifted back into the other end. In other shift registers, new data (ei-
ther specified data, zero(s) or one(s)) is shifted into one end and the data
shifted out at the other end is lost.
A C2000H PC that uses only a single CPU as opposed to a Duplex CPU.
This term is meaningless with other PCs, which are only available with sim-
plex operation.
A C2000H PC System that uses a Simplex CPU.
Short for Remote I/O Slave Unit.
A Rack containing a Remote I/O Slave Unit and controlled through a Remote
I/O Master Unit. Slave Racks are generally located away from the CPU Rack.
A position on a Rack (Backplane) to which a Unit can be mounted.
An error that originates in a software program.
A means of protecting data from being changed that uses software as op-
posed to a physical switch or other hardware setting.
The location from which data is taken for use in an instruction, as opposed to
the location to which the result of an instruction is to be written. The latter is
called the destination.
A dedicated Unit that is designed for a specific purpose. Special I/O Units
include Position Control Units, High-Speed Counter Units, Analog I/O Units,
ASCII Units, Ladder Diagram I/O Units, etc.
A data area in a PC used mainly for flags, control bits, and other information
provided about PC operation. The status of only certain SR bits may be con-
trolled by the operator, i.e., most SR bits can only be read.
A group of instructions placed after the main program and executed only if
called from the main program or activated by an interrupt.
A definer used to identify the subroutine that a subroutine call or interrupt
activates.
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