What is a Network?
⇒A network provides a means of connecting multiple devices together for the purposes of exchanging information.
→A common example of a network is an office where the computers are connected together with the use of an Ethernet network for the purpose of sending emails or printing documents on a networked printer.
Why use a network in automation?
There are many reasons to use a network. some examples are:
→Data acquisition from the control system.
→The control device in a remote location
→Data sharing between PLC controllers.
→The ability to program devices from a remote location.
→The ability to troubleshoot problems from a remote location.
→The ability to integrate all production areas of a plant.
→To integrate manufacturing systems with business systems.
Why are there so many networks?
There are many different networks exist for a variety of reasons:
→Different manufacturers
→Designed for many devices transferring large data blocks
→Designed to inexpensive
→Designed for maximum reliability
→Designed to support many communication protocols
Examples of networks used in industrial automation today:
→Ethernet/IP
→ControlNet
→DeviceNet
→DH+
→Remote I/O
→Foundation Fieldbus
→Profibus DP
→Modbus
→AS-i
Network types
→Fieldbus
A generic term covering all industrial networks
Note that there is also a specific network known as foundation Fieldbus that is often referred to as just Fieldbus.
→Information network
Typical devices are computers
In an industrial environment typically PLCs are on the network with computers.
Common uses are data collection data monitoring, file transfers, and email.
→ Control network
Typical devices are PLCs, HMI terminals, and I/O chassis.
A common use is for control of plant floor devices such as I/O chassis, robots, and other intelligent devices.
→ Device network
Typical devices are field devices such as buttons, lights, valves, and drives. Also small blocks of I/O.
A common use is for direct connection to field devices.
→Sensors
Typical devices are very simple field devices such as sensors, and lights.
A common use is for direct connection to field devices.
Note that there is also a specific network known as foundation Fieldbus that is often referred to as just Fieldbus.
→Information network
Typical devices are computers
In an industrial environment typically PLCs are on the network with computers.
Common uses are data collection data monitoring, file transfers, and email.
→ Control network
Typical devices are PLCs, HMI terminals, and I/O chassis.
A common use is for control of plant floor devices such as I/O chassis, robots, and other intelligent devices.
→ Device network
Typical devices are field devices such as buttons, lights, valves, and drives. Also small blocks of I/O.
A common use is for direct connection to field devices.
→Sensors
Typical devices are very simple field devices such as sensors, and lights.
A common use is for direct connection to field devices.
Common Networks Devices
→Repeater
→Hub
→Switch
→Gateway
Thank you
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