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Glossary
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segment
The portion of an Ethernet System that defines one network, i.e., a single coaxial
cable and all nodes connected to it.
self diagnosis
A process whereby the system checks its own operation and generates a warn-
ing or error if an abnormality is discovered.
server
A process or node that provides processing to a client.
servicing
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 Sys-
tems.
set
The process of turning a bit or signal ON.
set value
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.
socket
A file structure that serves as an end point for a virtual circuit created for commu-
nications.
software switch
See memory switch.
Special I/O Unit
A Unit that is designed for a specific purpose. Special I/O Units include Position
Control Units, High-speed Counter Units, Analog I/O Units, etc.
subnet number
The portion of the IP address used differentiate subnetworks in an Ethernet net-
work. This address exists only if the user sets a network mask for the IP address
to allocate part of the host number as the subnet number.
SV
Abbreviation for set value.
synchronous execution
Execution of programs and servicing operations in which program execution
and servicing are synchronized so that all servicing operations are executed
each time the programs are executed.
syntax
The form of a program statement (as opposed to its meaning). For example, the
two statements,
LET A=B+B
and
LET A=B*2
use different syntaxes, but have
the same meaning.
syntax error
An error in the way in which a program is written. Syntax errors can include
‘spelling’ mistakes (i.e., a function code that does not exist), mistakes in specify-
ing operands within acceptable parameters (e.g., specifying read-only bits as a
destination), and mistakes in actual application of instructions (e.g., a call to a
subroutine that does not exist).
SYSMAC LINK System
A communications system used to create data links and enable network com-
munications between PCs.
SYSMAC NET Link System
An optical LAN formed from PCs connected through SYSMAC NET Link Units. A
SYSMAC NET Link System also normally contains nodes interfacing computers
and other peripheral devices. PCs in the SYSMAC NET Link System can pass
data back and forth, receive commands from any interfaced computer, and
share any interfaced peripheral device.
SYSMAC NET Link Unit
The Unit used to connect PCs to a SYSMAC NET Link System.
system configuration
The arrangement in which Units in a System are connected. This term refers to
the conceptual arrangement and wiring together of all the devices needed to
Summary of Contents for SYSMAC C200HW-PCS01-EV1
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