Omron WIRED REMOTE I-O System Manual page 122

Programmable Controller
programming device
Rack
relay-based control
Remote I/O Master Unit
Remote I/O Slave Unit
Remote I/O Subsystem
Remote I/O System
Remote I/O Unit
Remote Terminal
series
Slave
Slave Rack
114
Glossary
A computerized device that can accept inputs from external devices and gen-
erate outputs to external devices according to a program held in memory.
Programmable 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, i.e., there is no
one individual Unit called a PC.
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.
An assembly of various Units on a Backplane that forms a functional unit in a
building-block PC System. Racks include CPU Racks, Expansion I/O Racks,
I/O Racks, and Slave Racks.
The forerunner of PCs. In relay-based control, groups of relays are wired to
each other to form control circuits. In a PC, these are replaced by program-
mable circuits.
The Unit in a Remote I/O System through which signals are sent to all other
Remote I/O Units. The Remote I/O Master Unit is mounted either to a CPU
Rack or an Expansion I/O Rack connected to the CPU Rack. Remote I/O
Master Unit is generally abbreviated to simply "Master."
A Unit mounted to a Backplane to form a Slave Rack. Remote I/O Slave Unit
is generally abbreviated to simply "Slave."
A Master and all of the Remote I/O Units connected in series to it. A Remote
I/O Subsystem exists when more than one Master is mounted to a PC. If
Subsystems exist, the System is considered a Multilevel Remote I/O System.
A system in which remote I/O points are controlled through a Master
mounted to a CPU Rack or an Expansion I/O Rack connected to the CPU
Rack.
Any of the Units in a Remote I/O System. Remote I/O Units include Masters,
Slaves, Optical I/O Units, I/O Link Units, and Remote Terminals.
A Remote I/O Unit connected in a Wired Remote I/O System to provide up to
sixteen I/O points at one location. There are two types of Remote Terminals:
G72C Remote Terminals which feature fixed transistor inputs and outputs
and Remote Terminals constructed by combining a Remote Interface and I/O
Block. I/O Blocks feature replaceable relays that can be individually changed
to meet specific I/O requirements.
A wiring method in which Units are wired consecutively in a string. In Link
Systems wired through Link Adapters, the Units are still functionally wired in
series, even though Units are placed on branch lines.
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.