- May 06, 2022
- Moxa Technologies Inc
May 3, 2022 - In substations, real-time monitoring is always of critical importance. However, for substations whose operations run on many legacy devices, real-time monitoring can be an enormous challenge for operators. While most substations are open to the idea of retrofitting, tight budgets curtail them most of the time. For these budget-challenged substations, the ideal solution is one that bridges a legacy infrastructure to an IEC 61850 network without breaking the bank.
EC 61850 MMS (Manufacturing Message Specification) is a client/server based protocol for communications between IEDs (Intelligent Electronic Devices) and higher level entities over Ethernet. It is part of the IEC 61850 standard for communication technology in substations and allows to access the server through its IP address in order to write/read data and exchange files.
To have a better understanding of these substations’ dilemma, let’s take a closer look at the key aspect. Many remote terminal units (RTUs), human-machine interfaces, switches, and intelligent electronic devices (IEDs) installed in substations are from different vendors. They usually use proprietary or industrial protocols, making it extremely difficult for a power SCADA system to monitor the entire station. These days, new power SCADA supervision commonly supports the IEC 61850 MMS protocol. Thus, operators can bridge the communication between field devices and an IEC 61850-based power SCADA system so that they can monitor power quality in real time.
In addition, the increasing number of cyberattacks at substations makes network communication security more important than ever. Subsequently, operators are looking for a secure communication solution that will reduce security concerns when they are retrofitting power substations.
Streamlining communications for industrial protocols
Mission-critical IEDs need to communicate with power SCADA systems directly so that operators can monitor power quality in real time and take immediate actions when accidents happen. Compared with computing platforms, communication gateways are a cost-effective solution as they have a variety of built-in power industry-related protocols, such as IEC 61850 MMS, Modbus RTU/TCP, DNP3 serial/TCP, IEC 60870-5-101, and IEC 60870-5-104. These communication gateways easily bridge the communications between the IEC 61850-based SCADA systems and the different legacy IEDs used in substation automation systems.
However, when the operator is using gateways to bridge communication between a variety of industrial protocols and the IEC 61850 MMS protocol, it takes tremendous time to edit the Substation Configuration Language (SCL) of IEC 61850 because of its complex settings. Fortunately, tools are available in the market to make this process more efficient. Therefore, consider adopting one of these useful engineering tools to simplify the complexity of editing SCL files when dealing with large-scale substation retrofit projects. However, an additional budget is required for this purchase.
Monitoring proprietary-based field devices without replacement
Substations operating for decades have legacy devices running proprietary communication protocols, and it is not cost-effective to replace all of them at once. If an upgrade is needed to substation automation systems to modern Ethernet-based SCADA, monitoring these field devices with minimal cost and effort is essential. Adopting a connectivity solution such as serial device servers easily helps develop transparent connectivity between IEC 61850-based power SCADA systems and proprietary-based field devices. This way, power SCADA monitors these legacy proprietary-based field devices by decapsulating Ethernet proprietary protocols.
Moxa provides a variety of connectivity solutions for different application demands. To streamline communication, the Moxa MGate 5119 Series is an easy-to-use substation gateway. It not only establishes communication easily from Modbus, DNP3, IEC 60870-5-101, and IEC 60870-5-104 devices to IEC 61850 communication networks but also supports NTP time synchronization functions to provide data with a consistent time stamp. The MGate 5119 Series supports a built-in SCL file generator that easily completes SCL files for substation gateways. Therefore, there is no need to spend time and money to look for additional tools.
To monitor proprietary-based field devices, the Moxa NPort S9000 Series is a serial device server that migrates serial IEDs to an Ethernet-based infrastructure for legacy substation retrofits. The NPort S9000 Series supports up to 16-port serial interfaces, 4-port Ethernet switching, and Ethernet-encapsulated proprietary protocols to easily bring field devices to SCADA systems. In addition, the NPort S9000 Series supports NTP, SNTP, IEEE 1588v2 PTP, IRIG-B time synchronization functions, synchronizing not only the NPort S9000 but also the legacy field devices.
When visualizing substation networks, it is essential to enhance device security on the networks. Moxa serial device servers and protocol gateways address security concerns when connecting field devices to networks. The devices incorporate IEC 62443 and NERC CIP guidelines, featuring security embedded functions, such as user authentication, accessible IP lists, and secure device configuration and management through HTTPS and TLS v1.2 to protect communication devices from unwanted access. What’s more, Moxa solutions perform vulnerability scan periodically to take necessary actions, such as security patches, to enhance device security for substation networks.