SEL RTAC AS MODBUS SERVER SERIAL
The 3505 has only four serial ports the number of ports increases with the 35. There are also physical connection limitations to consider, in terms of how many devices you can aggregate. The 3555 can handle many more than that, in the 150 to 200+ range, and it can also support up to 100,000 tags (data points).Īdditionally the RTAC you choose will depend greatly on how many devices you will need it to communicate with, and how many tags you need to support. The 3505 can usually handle five to 10 devices, and the 3530 up to about 50 devices. The faster the processor and the greater the RAM capacity, the more plant devices the RTAC can handle.
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The 3555 has the fastest and most powerful processor and the most RAM, the 3505 has the least, and the 3530 is in the middle. If you've ever purchased a computer, you're familiar with comparing processing power and RAM between different models, and RTACs have a similar hierarchy. SEL-3555: biggest, fastest, most advanced.SEL offers three different "levels" of RTACs: What are the various types of RTACs available and why would you use one versus another (i.e. This makes them well-equipped to handle any type of storage-only, solar-only or solar-plus-storage project. As we covered earlier, RTACs support industry standard protocols like Modbus and DNP3.
SEL RTAC AS MODBUS SERVER ISO
The SEL RTAC has the capability to function as a California ISO (CAISO) RIG, with an encrypted telemetry connection.Ĭan an RTAC be used to support either a solar-plus-storage or a storage-only project?Ībsolutely. Many utilities use the SEL RTAC for data concentration. It is a data aggregator that concentrates data on a local basis and sends it off to an ISO or utility. A RIG is a telemetry device that allows an ISO or utility to collect required data from the project site.
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RTACs are excellent at facilitating data telemetry in and out of the solar PV site, and can even function as a Remote Intelligent Gateway (RIG). RTU, telemetry, 3rd party off takers, RIG, etc.) However, these two functions can potentially be performed by the same RTAC. Typically, the substation and SCADA functions are handled by two separate RTACs that have a single line of communication between them. Some RTAC models can even serve as an HMI, providing an interface for operators to send commands. (We will cover these later on in the article.) They are able to run and execute logic for nearly any application, sending out commands to control plant devices and regulate output. RTACs can be used as power plant controllers (PPCs), with some limitations. SEL RTACs can support these popular protocols as well as many others. Modbus and DNP3 are two of the most common protocols used in SCADA networks.
![sel rtac as modbus server sel rtac as modbus server](https://rpa.mn/Files/Products/1128.jpg)
A protocol is a system of rules that allows two or more networked entities to communicate.
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They are typically used in substations as data concentrators and/or protocol converters, mostly for communicating with the electrical metering and protection devices. RTACs are industrially hardened so they're suitable for substation environments. How are RTACs used at solar PV power plants? Substation Use RTACs are manufactured by Schweitzer Engineering Laboratories (SEL), who also produce many other energy industry devices. RTACs can potentially fulfill many roles at a solar PV plant, including data concentration, protocol conversion, data telemetry and device control. A Real Time Automation Controller (RTAC) is a powerful multipurpose controller/communication device.