Glossary
386
SV
Abbreviation for set value.
switching capacity
The maximum voltage/current that a relay can safely switch on and off.
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
specifying operands within acceptable parameters (e.g., specifying reserved
SR bits as a destination), and mistakes in actual application of instructions
(e.g., a call to a subroutine that does not exist).
SYSMAC NET Link System
An optical LAN formed from PCs and other devices connected through SYS-
MAC NET Link Units, NSBs, and NSUs. 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 periph-
eral 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.
system error
An error generated by the system, as opposed to one resulting from execu-
tion of an instruction designed to generate an error.
system error message
An error message generated by the system, as opposed to one resulting
from execution of an instruction designed to generate a message.
TC area
A data area that can be used only for timers and counters. Each bit in the TC
area serves as the access point for the SV, PV, and Completion flag for the
timer or counter defined with that bit.
TC number
A definer that corresponds to a bit in the TC area and used to define the bit
as either a timer or a counter.
terminal instruction
An instruction placed on the right side of a ladder diagram that uses the final
execution conditions of an instruction line.
terminator
The code comprising an asterisk and a carriage return (* CR) which indicates
the end of a block of data, whether it is a single-frame or multi-frame block.
Frames within a multi-frame block are separated by delimiters.
timer
A location in memory accessed through a TC bit and used to time down from
the timer’s set value. Timers are turned ON and reset according to their ex-
ecution conditions.
TM area
A memory area used to store the results of a trace.
transmission distance
The distance that a signal can be transmitted.
TR area
A data area used to store execution conditions so that they can be reloaded
later for use with other instructions.
trace
An operation whereby the program is executed and the resulting data is
stored in TM memory to enable step-by-step analysis and debugging.
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