||System that stores data in a table
format with columns and rows. Allows adding rows, updating rows,
deleting rows and retrieving rows.
||Ethernet communications module
||Network that allows from 10mps to 100mps
connections. Typically found in an office network for
sharing files and printers.
||Open standard for device communication
over Ethernet. Supported by Allen-Bradley.
||Human Machine Interface. Used for
operator interfaces in controlling processes at plants and
||HyperText Markup Language. Code
that describes how to present Web pages.
||Special type of program that runs in the
background, regardless of whether anyone is logged in or not.
Automatically starts whenever computer is powered on.
||Communication standard for serial cables.
Established in the 1970s.
||Variant of Modbus that allows
communications over Ethernet connections, instead of serial
||See Microsoft Windows Service.
||OLE for Process Control. Standard
communication protocol between machine devices and Windows PCs.
Used in DataNet OPC to allow displaying machine data in a web
||New technology that allows
the PLC to have full control over data traffic. Unlike polling,
report-by-exception logging allows the device to send data to the data-logging computer
only when needed.
||Supervisory Control And Data
Acquisition. Full-fledged software package that allows
control interfaces as well as data logging facilities.