28/12/2022
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12/11/2016
SCADA:
Supervisory control and data acquisition (SCADA) is a control system architecture that uses computers, networked data communications and graphical user interfaces for high-level process supervisory management, but uses other peripheral devices such as programmable logic controllers and discrete PID controllers to interface to the process plant or machinery. The operator interfaces which enable monitoring and the issuing of process commands, such as controller set point changes, are handled through the SCADA supervisory computer system. However, the real-time control logic or controller calculations are performed by networked modules which connect to the field sensors and actuators.
12/11/2016
Modbus:
Modbus is a serial communications protocol originally published by Modicon in 1979 for use with its programmable logic controllers. Simple and robust, it has since become a standard communication protocol, and it is now a commonly available means of connecting industrial electronic devices. The main reasons for the use of Modbus in the industrial environment are:
1. developed with industrial applications in mind
2. openly published and royalty-free
3. easy to deploy and maintain
4.moves raw bits or words without placing many restrictions on vendors
11/11/2016
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11/11/2016
PLC advantages compared to Relay Logic Controllers:
1.Ability to interface / communicate with computers
2.Simple programming
3.High reliability
4.Easy maintenance
5.Rugged construction - can operate in extremely harsh conditions
6.Small size
7.Easy expandability
8.Economical in long term