| 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. |
