ETAT Glossary

There are currently 19 names in this directory beginning with the letter M.
M2M (Machine to Machine)
A typically closed network of devices in which they can communicate with one another and/ or other control systems located on the same network.

MAC Address
A unique identifier of a network device that is hard coded and fixed; in the form of a six byte hex number where 3 bytes contain a manufacturer ID and 3 bytes contain a unique device identifier

main program
A term used in contrast to a subroutine. You branch to a subroutine from the main program and return to the main program from a subroutine.

Management Information Systems
(MIS) A general term for the computer systems in an enterprise that provide information about its business operations. It's also used to refer to the people who manage these systems. The term is used broadly in a number of contexts and includes (but is not limited to): decision support systems, resource and people management applications, project management, and database retrieval applications.

A machine or robotic mechanism of which usually consists of a series of segments (jointed or sliding relative to one another) for the purpose of grasping and/or moving objects (pieces or tools), usually in several degrees of freedom. The control of the manipulator may be by an operator, a programmable electronic controller or any logic system (for example cam device, wired, etc.) (ISO 8373)

Manufacturing Execution Systems
(MES) A factory floor, performance oriented system that uses network computing to automate production control and process automation. This can be achieved by downloading recipes and work schedules, and uploading production result thereby bridging the gap between business and plant-floor or process control systems. By capturing realtime information about set-ups, run times, throughput, and yields, an MES can measure constraints and identify bottlenecks, to allow better management of manufacturing capacity.

mathematical operator
an operator that performs some mathematical function on some numbers. e.g. multiplication or addition

mechanism within basic Server-Client DHCP to assure that a device on a particular port will be assigned a

Mesh Network
Mesh networks are multinode structures that connect through multiple routers. These connections tend to be direct, dynamic and not based on an inherent hierarchy. They are agile enough to adapt to various networking conditions to relay data efficiently. Mesh networks’ ability to self-configure means they can recover from failed nodes without needing external maintenance and handle long-range transmission. They are a good fit for enterprise IoT applications, which need to remain reliable even at a large scale.

Message Queueing Telemetry Transport (MQTT)
A lightweight messaging protocol for small sensors and mobile devices. Useful for connections with remote locations where a small code footprint is required.

Often referred to by the short name msg which is the variable name generally used to reference the message. This is the data object used to communicate between nodes. Typically, it has the minimal definition: {{_msgid: uid, topic: undefined|string, payload: Object|Array|string|number}} but other than requiring _msgid (which is added by Node-RED), it may contain any valid, serialisable JavaScript

A function which is tied to a particular object. Each of an object’s methods typically implements one of the things it can do, or one of the questions it can answer.

A ladder diagram written in alphanumeric characters for easier understanding than the machine language program to be executed by CPU Unit. The mnemonic code can be converted to a ladder diagram in the PLC.

An open protocol for the serial communications developed by Modicon Inc.(AEG Schneider Automation International S.A.S.). The protocol is widely used in the FA and PA markets for devices such as inverters and temperature controllers. They do not have an organization for verification or approval like other open protocols do. The protocol includes Modbus-ASCII and Modbus-RTU.

A CPU Unit operating mode in which the program is executed, but in which the following operations are possible from a Programming Device: Force-setting/resetting bits, online editing, changing PVs in I/O memory, etc. MONITOR mode is used for test operation.

MQTT is an OASIS standard messaging protocol for the Internet of Things (IoT). It is designed as an extremely lightweight publish/subscribe messaging transport that is ideal for connecting remote devices with a small code footprint and minimal network bandwidth.

MQTT Broker
An MQTT broker, which is the heart of the MQTT Publish/Subscribe protocol, is a server that receives all messages from the MQTT clients and then routes the messages to the appropriate subscribing clients.

MQTT โบรกเกอร์
โบรกเกอร์ MQTT ซึ่งเป็นหัวใจของโปรโตคอล MQTT Publish/Subscribe คือเซิร์ฟเวอร์ที่รับข้อความทั้งหมดจากไคลเอนต์ MQTT แล้วกำหนดเส้นทางข้อความไปยังไคลเอ็นต์ที่สมัครเป็นสมาชิกที่เหมาะสม

Operating systems support multitasking, which allows multiple tasks (programs) to run concurrently, taking turns using the resources of the computer.

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