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Supervisory Control and Data Acquisition (SCADA) Communication

SCADA communication network infrastructure is a core component of a Monitoring System.

SCADA communication can happen in a number of ways. For SCADA communication networks, early SCADA communication took place over radio, modem, or dedicated serial lines. Today, it is much more common for SCADA communications to travel over LAN or SONET.

SCADA

The process of communication over a SCADA system involves several different SCADA system components. These components ensure smooth operation across the SCADA communication network. These include the sensors and control relays, RTUs, master units, and the overall network.

Smarter RTUs Make Efficient SCADA Communication Networks

Smarter RTUs make your SCADA set up easier. In any SCADA communication network, each of these parts are needed for good SCADA communication. A system can monitor alarms and status updates within the network only when all of the underlying components function well. For more complete monitoring of SCADA communications, you can use smarter RTUs with special processing abilities.

The RTU is where most SCADA is grouped in the system. Values from inputs and outputs, referred to as SCADA points, are sent from single sensors to the RTU. Through a SCADA communication network, the RTU is tasked with sending these SCADA notes to the master station, or HMI.

SCADA Topology
PLC SCADA presentation overview.

The HMI: A Translator for Your SCADA Communication Network

The HMI is the component of the SCADA communication system that takes all of the data from the RTUs across the network. Then, it converts it into a form that is readable by humans. This allows for easy interactions within the SCADA communication network. Network staff examine the SCADA communications in the sorted HMI view. With good situational awareness, they can respond to network alarms appropriately.

SCADA can contain sensitive data, so it is important to use secure LAN networks when transmitting data to RTUs and the master station. Securing your SCADA communication network is crucial for operational safety. However, LAN can cost a lot to install at remote sites, and it may not be feasible for an company to immediately join all of their remote sites into the LAN network. What's most important is knowing the risks in your industry and having a good security plan.

SCADA Topology

NetGuardians Provide Options for SCADA Communication Networks

Using NetGuardian 832A RTUs gives you the ability to switch out your SCADA system slowly. They support older transports like serial (RS232 or RS485), but also support LAN. This allows your SCADA communication network to adapt and grow as your infrastructure evolves. This means that you can transmit SCADA communication over the LAN as your network expands outward.

The NetGuardian is designed to talk over several connection types (LAN, serial, and dial-up). This allow you to simply switch your RTU device to the LAN port when LAN is available at your site. Such flexibility is needed for maintaining an efficient SCADA communication network. This provides a cost-effective communication solution. You can then expand LAN over several billing cycles while still using your existing SCADA communication equipment.

Resources Related to SCADA Tutorials:
SCADA Tutorial White Paper.


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