Database - System that stores data in a table format with columns and rows. Allows adding rows, updating rows, deleting rows and retrieving rows.
ECOM - Ethernet communications module provided by AutomationDirect.
Ethernet - Network that allows from 10mps to 100mps connections. Typically found in an office network for sharing files and printers.
Ethernet/IP - Open standard for device communication over Ethernet. Supported by Allen-Bradley.
HMI - Human Machine Interface. Used for operator interfaces in controlling processes at plants and manufacturers.
HTML - HyperText Markup Language. Code that describes how to present Web pages.
Microsoft Windows Service - 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.
Modbus - Communication standard for serial cables. Established in the 1970s.
Modbus TCP - Variant of Modbus that allows communications over Ethernet connections, instead of serial cable connections.
NT Service - See Microsoft Windows Service.
OPC - 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 page.
Report By Exception - 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.
SCADA - Supervisory Control And Data Acquisition. Full-fledged software package that allows control interfaces as well as data logging facilities.
TCP/IP - Transmission Carrier Protocol/Internet Protocol.
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