The Statement Combines the Output of Two SELECT Queries

question 94

Short Answer

The statement combines the output of two SELECT queries.

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Definitions:

Processor Scanning

The process by which a programmable logic controller's processor reads input states, executes logic, and updates outputs cyclically.

STI Instruction

An instruction used in some programmable logic controllers (PLCs) to specify actions that occur at timed intervals, typically for periodic tasks.

Starter Auxiliary Contact

An auxiliary switch in a motor starter that provides a secondary set of contacts for controlling additional functions or status indication.

Programmed Contact

A virtual representation of a physical contact in a PLC program, which can be turned on or off based on program logic.