A Memory Tag contains a value specified during configuration. Unlike other Tags, Memory Tags do not automatically change their value. They hold the same value until some other entity (script, binding, or some other user-created mechanism) changes their value.

A Manufacturing Execution System (MES) is a control system for managing and monitoring work-in-process on a factory floor. Manufacturing information is tracked by the MES in real time as it receives data from robots, machine monitors, and employees.

An MES can be used to operate as a self-contained system or integrated with enterprise resource planning (ERP) software suites. The goal of an MES is to improve productivity and reduce the total time to produce an order (cycle time). By integrating an MES with ERP software, factory managers can understand how current conditions on the plant floor can be optimized to improve production output.

MES systems generally include OEE, Downtime, Track and Trace, and and other data management systems.

Microsoft SQL Server (MS SQL) is Microsoft's flagship database. Ignition connects easily to it and can use it to store or retrieve data.

In Ignition, mobile usually refers to using a device such as a phone or tablet to launch a Client or a Session.  

Modbus is a serial communications protocol originally developed in 1979 for use with programmable logic controllers (PLCs). Modbus is transmitted over serial lines between devices. Many devices around the world (sometimes referred to collectively as 'Modbus devices') use this protocol to share data with other systems like Ignition.

Modular refers to an architecture type that allows you to add and remove pieces (modules) to change the functionality, instead of installing a different piece of software for each possible configuration. Ignition has a modular architecture because you can pick and choose which modules you want and ignore the rest.

A modular architecture sometimes includes the ability to add and remove functionality without stopping the software. This is referred to as a 'hot swap,' and is built into Ignition.

A compartmentalized addition to an Ignition server that when installed will introduce extra features. Modules can be added or removed from the Gateway Webpage, and additional modules can be downloaded from the Inductive Automation website.

Message Queueing Telemetry Transport (MQTT) is a standard machine-to-machine data transfer protocol. The Cirrus Link modules are often referred to as the 'MQTT modules' because they use this protocol to send data between the server and devices.

Multivariate describes data involving two or more variable quantities. Multivariate analysis is a set of techniques used for analysis of data sets that contain more than one variable, and the techniques are especially valuable when working with correlated variables. For example, if you are using compressed air in your process you may want to track both the air pressure and the air temperature to determine maximum efficiency.

MySQL is a relational database. Ignition connects easily to it and can use it to store or retrieve data.

See MES.


In Ignition, a mnemonic is an underlined alphanumeric character that appears in a menu title, menu item, or the text of a button or component of the user interface. Used in conjunction with the Alt key, a mnemonic gives the user a keyboard shortcut to access an item (rather than having to use the mouse to navigate).

See Responsive Design.

In security, multi-factor authentication (MFA) is a method of confirming a user's claimed identity. The user is granted access only after successfully presenting two or more pieces of evidence across three main categories: what you know (knowledge), what you have (possession ), and what you are (inherence). See also 2FA.

See multi-factor authentication.

In Ignition, all Perspective components have Meta properties such as component name, visibility, and rotation. These properties are metadata, which is essentially data that describes other data (the component). Metadata summarizes basic information about data. In a document, for example, metadata could be author, date created, date modified, and file size.

See Meta properties.