3G5A2-RPT01-PE datasheet(175/182 Pages) OMRON

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Glossary

163

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.

slot

A position on a Rack (Backplane) to which a Unit can be mounted.

software error

An error that originates in a software program.

software protect

A means of protecting data from being changed that uses software as opposed

to a physical switch or other hardware setting.

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.

SRAM

Static random access memory; a data storage media.

subroutine

A group of instructions placed separate from the main program and executed

only when called from the main program or activated by an interrupt.

Abbreviation for set value.

switching capacity

The maximum voltage/current that a relay can safely switch on and off.

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).

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

comprise the System. In OMRON terminology, system configuration is used to

describe the arrangement and connection of the Units comprising a Control Sys-

tem that includes one or more PCs.

system error

An error generated by the system, as opposed to one resulting from execution 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.

terminator

The code comprising an asterisk and a carriage return (* CR) which indicates the

end of a block of data in communications between devices. Frames within a mul-

ti-frame block are separated by delimiters. Also a Unit in a Link System desig-

nated as the last Unit on the communications line.

3G5A2-RPT01-PE Datasheet(PDF) 175 Page - Omron Electronics LLC

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