What is RTU equipment? What are the main functions of RTU settings?

What is RTU equipment? What are the main functions of RTU settings?

1. What is RTU equipment?

RTU is the abbreviation of Remote Terminal Unit (remote measurement and control terminal), which is responsible for the monitoring and control of on-site signals and industrial equipment.

RTU is the core device that constitutes an enterprise's integrated automation system. It is usually composed of signal input/output modules, microprocessors, wired/wireless communication equipment, power supplies, and shells. It is controlled by microprocessors and supports network systems. Through its own software (or intelligent software) system, it can ideally realize the functions of telemetering, remote control, remote signaling and remote adjustment of primary instruments on the production site by the central monitoring and dispatching system of the enterprise.

2. What are the functions of RTU?

The composition of RTU

RTU's hardware mainly includes functional modules such as CPU, memory, and various input and output interfaces. These modules are integrated into the circuit board, and the functional modules of the RTU are connected through the circuit board wiring. The CPU is the central system of the RTU controller, responsible for processing various input signals, and after arithmetic processing, the output is completed.

The memory is the RTU memory system, used to store various temporary or permanent data. RTU generally includes various interfaces such as switch input, switch output, analog input, analog output, and RS485 communication.

Function of RTU

1. Provide multiple digital interfaces and multiple analog interfaces;

2. Collect the status data and send it to the remote, with photoelectric isolation, and priority transmission of the remote signal displacement;

3. Collect data volume and send to remote, with photoelectric isolation;

4. Directly collect the power frequency power of the system, realize the measurement of voltage, current, active power, and reactive power and send it to the remote, and calculate the forward and reverse power;

5. Collect the pulse electrical measurement and send it to the remote, with photoelectric isolation;

6. Collect event sequence records and send to remote;

7. Receive and execute remote control and return to school;

8. Accept remote commands and choose to send various types of information;

9. Can be remote/local settings;

10. Program self-diagnosis and self-recovery;

Features of RTU:

Very strong environmental adaptability, working temperature -40℃—70℃, environmental humidity 5%—95%RH;

Very strong anti-electromagnetic interference ability;

Multiple standard communication protocols;

Abundant communication interfaces, support multiple communication methods, and long communication distance;

It is widely used in water conservancy, power dispatching, municipal dispatching and other industries with remote signaling, telemetry, and remote control.

Application scenarios of RTU:

Compared with the commonly used programmable controller PLC, RTU usually has excellent communication capabilities and larger storage capacity, is suitable for harsher temperature and humidity environments, and provides more computing functions. RTU products are widely used in SCADA systems in industries such as oil and gas, water conservancy, power dispatch, and municipal dispatch.

Nowadays, RTU technology is developing in the direction of intelligence. The intelligent RTU can automatically determine whether the acquired data needs to be reported to the central control station immediately, or it can be temporarily stored locally for later transmission, or until the central control station requires it to be transmitted. The intelligent RTU can automatically detect the interruption of communication, and immediately start to save the data in the memory, so that the communication network can be used most effectively.

The intelligent RTU can also transmit critical data to several central control stations at the same time. In addition, since security is the biggest problem in current communication networks, intelligent RTU can encrypt data before transmission, and it can also deny access from unknown addresses.