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Glossary

This table lists explanations for terms used with the WebPort and the WebPort User Interface software:

Item Description
A/C Refers to alternating current. This is a sine wave signal that is typically associated with magnetic pickup flow meters.
ADC Analog-to-digital converter. An analog-to-digital converts a continuous input such as voltage to binary, time-sampled values.
Attenuation The reduction in magnitude of a signal as it passes through a system. The opposite of gain.
ARM Advanced RISC Machine. This type of processor provides processing power for custom application-specific integrated circuits and uses very little electrical power. The processors are used in mobile phones, GPS navigation devices, and game devices, and digital cameras, and many other applications.
ASP Application service provider. Software that is provided over a network as a service to businesses that do not wish to, or cannot afford to, provide the software services for themselves.
API Application Programmer Interface. Software that provides source code specifications intended for use by developers to create interfaces that communicate with each other using the code routines, data structures, and object classes that may be provided by the API.
APN Access point name. Computer protocol that enables a user to access data over the Internet using a mobile phone network.
Channel Refers to one of eight, small-signal analog input interfaces to the module’s terminal block. Each channel is configured for connection to an input device, and has its own configuration and status words.
Chassis See rack.
Check Boxes Allows you to select one or more options, or to turn an action on. Example: Notify on Alarm, Return, End, Acknowledge.
Common mode rejection ratio (CMRR) The ratio of a device’s differential voltage gain to common mode voltage gain. Expressed in dB, CMRR is a comparative measure of a device’s ability to reject interference caused by a voltage common to its terminal relative to ground.
Common mode voltage The voltage difference between the negative terminal and analog common during normal differential operation. Cut-off frequency - The frequency at which the input signal is attenuated 3 dB by the digital filter. Frequency components of the input signal that are below the cut-off frequency are passed with under 3 dB of attenuation for low-pass filters.
CPU Central Processing Unit. Carries out the instructions provided by a computer program. Normally these are basic logical, input/output, and arithmetical operations that form the basis of most software operations on a computer.
DHCP Dynamic Host Configuration Protocol. A type of network configuration for host devices that dynamically provides IP, gateway, and routing address for devices that are connected to that network. This means that the WebPort dynamically allocates IP addresses to the devices that you connect to it.
DHCP Client Dynamic Host Configuration Protocol Client. When you connect a new device such as a computer, or a WebPort to a network that has a DHCP Server set up, the client device gets its IP address and other configuration information such as default gateway and domain name from a group of IP addresses maintained by the DHCP server for a defined time period.
DAC Digital-to-analog converter. A device that converts a binary (digital) code to a continuous signal such as current, voltage, or an electric charge.
dB Decibel. A logarithmic measure of the ratio of two signal levels.
DC Direct Current. This is typically associated with a DC square wave pulse signal from a flow meter.
Date Picker Use this option to type in a date in the fields provided, or to choose one or more dates from a calendar popup form. When you select the calendar popup, the calendar opens with the current date already selected for you. The calendar remains open as long you your mouse cursor is hovering over the calendar dialog, or until you select a date. Date format is: DD/MM/YYYY, where DD contains 1 or 2 digits, and range is 0 to 31; MM contains 1 or 2 digits, and range is 1 to 12; and YYYY contains 4 digits.
Data Grid When viewing WebPort data, such as logs, alarms, and data logs, the data are arranged in a data grid. The data are always sorted in ascending and alphabetical order. To reverse a column, click on it, All data resorts by rows.
Digital filter A low-pass mathematic single order filter applied to the signal. The digital filter provides high-frequency noise rejection.
Drop-Down List Provides a list of options for selection. Example: Action types; email, ftp, sms.
Flash A type of non-volatile memory that can be electronically erased and re-written.
FTP/FTPS File Transfer Protocol/File Transfer Protocol Secure. A standard network protocol standard used to transfer files from one computer or host to another over a network that uses the TCP/IP communications protocol. FTP is therefore frequently used to transfer files over the Internet.
FSF Free Software Foundation. A non-profit foundation that supports free software. It wrote an operating system, GNU, that is similar to Unix but is free to all users. The General Public License (GPL) was written for distribution with the operating system but is frequently used for other free software packages.
FPGA Field programmable gate array. An integrated circuit that can be programmed by users after the circuit is manufactured.
GPL GNU Public License. A license offered by the Free Software Foundation that covers licensing and distribution of free software.
GSM(™) Global System for Mobile Communications. Standard developed in Europe to describe second-generation (2G) digital cellular networks. Digital cellular networks currently number up to 4G. The GSM standard is the most widely used digital cellular network standard.
HTTP/HTTPS Hypertext Transfer Protocol. Communication protocols that access the world-wide web. HTTP protocol is not secure. HTTPS is secure. The S designation means that the transfer protocol is combined with the Secure Socket Layer/Transport Security Layer (SSL/TLS) protocol to provide secure communication for transactions such as payments across the Internet.
Effective resolution The number of bits in the channel data word that do not vary due to noise.
EtherNetIP™ An industry standard protocol for communicating with IO devices. EtherNetIP means Ethernet Industrial Protocol.
IO Device Industrial Automation Input/Output Device. These devices are programmed to contain one or more tags.
Local System A control system that has the I/O chassis within several feet of the processor.
LED Light-emitting diode. Photons emitted from a semi-conductor provide indicator signals for electronic devices and various forms of lighting. An LED can emit light photons in different colors, including red, green, and purple, and different frequencies (visible, infrared, and ultraviolet).
LSB Least significant bit. The bit that represents the smallest value within a string of bits.
MAC Media Access Control address. A unique set of numbers assigned to a network interface card and stored in the read-only memory. A MAC address may also be called the Ethernet hardware address or the physical address of a device.
MII Media independent interface. Provided a standard interface used to connect a MAC fast Ethernet block to a PHY chip.
MODBUS An industry standard protocol for communicating with IO devices. This protocol usually uses serial communication as the physical layer.
MODEM Modulator/demodulator. A device that encodes digital information in an analog carrier signal, transmits the signal, then decodes the information to reproduce the original data.
Module update time See channel update time.
MUX Multiplexer. A device that selects among several different analog signals, and forwards the selected signal via a single output or line.
Normal mode rejection (differential mode rejection) A logarithmic measure, in dB, of a device’s ability to reject noise signals between or among circuit signal conductors, but not between the equipment grounding conductor or signal reference structure and the signal conductors.
PHY Physical layer that connects a media access control address (MAC) on a device to a physical communications medium such as copper cable or a fiber optic cable. When integrated in a chip and placed on an Ethernet device, it often implements the send and receive functions of Ethernet frames.
PLC Programmable logic controller. A digital computer used to automate industrial processes such as controlling electrical turbine operation, assembly lines, and manufacturing machinery. The controllers are frequently ruggedized to withstand difficult operating environments.
Radio Buttons Allows you to select one among two or more options. When an option is selected, all other options are unselected.
Remote system A control system where the chassis can be located several thousand feet from the processor chassis. Chassis communication is via the 1756-DHRIO and 1756-ENET Adapter.
Resolution The smallest detectable change in a measurement, typically expressed in engineering units (e.g. 0.15 °C).
Serial Serial data protocol using RS-232. This is a method of communicating with many devices, including IO devices by sending data as a single stream, one bit at a time, over a computer bus or a communications channel.
SCADA Supervisory control and data acquisition. Refers to data exchanged between computer systems that monitor industrial, facility, or infrastructure processes. Examples include oil refining and refineries, airports, railroad systems, and waste water treatment or power plants.
SMS Short message service. A text message that can be exchanged using cell phones, emails, or devices that have access to the Internet, such as routers, computers, or programmable logic controllers.
Sampling time The time required by the module to sample an input channel.
Step response time The time required for the module to reach 95% of its expected, final value, given a full-scale step change in the output data word.
Tag Name given to a data element on a Data I/O device. Tags allow a user to interact with data on a Data I/O device. Tags often combine device type and the tag name. Example: PumpController2.Level3
Tags Identifiers for configuration, data, and status information found within the module. Tags allow the user to modify specific module attributes and view data and status.
TCP, TCP/IP Transmission Control Protocol, Internet Protocol. A group of communications protocols used to communicate between computers on the Internet or other networks. Also called The Internet protocol suite. The suite sends data across the Internet in packets.
Text Field Used for short descriptions such as a log name. Character limit is 100 characters. Restricted characters are: Backslash, curly braces, single-quote mark, double-quote mark, percentage, caret, and semi-colon.
Text Area Used for longer descriptions. Character limit is 300 characters. Restricted characters are: Backslash, curly braces, single-quote mark, double-quote mark, percentage, caret, and semi-colon.
Time Picker Use this option to type in a time in the fields provided, or to choose one or more time selection from a drop-down list. Options are: Hours where allowable numbers are 1 to 12; Minutes, where allowable numbers are 1 to 59; and AM or PM. The default time is 12:00 AM.
Update time The time for the module to sample and convert a channel input signal and make the resulting value available to the ControlLogix processor.
User Interface (UI) Group A group of related user interface software elements. Example: View and Configuration groups in the WebPort User Interface software.
Virtual Private Network (VPN) A virtual private network (VPN) is a secure communications network that uses external telecommunications methods to transfer data. You normally use a VPN to 'tunnel' through the Internet from an internal network (LAN) to a remote site, or to access your LAN from a remote site. The protocols used to communicate this way are normally encrypted methods such as passwords and encryption keys. It is very hard for external users to detect the network using packet sniffing or traffic intercepts. It is also very hard to mimic (spoof) the identity of a user on a VPN.
WWW World Wide Web. A system of documents known as hypertext, linked throughout the world via the Internet. These documents may be viewed as web pages.

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