What is the function of industrial-grade remote wireless transmission device?

I. Introduction to the working principle

In general, the industrial two-way mixed-signal wireless transmitter DTD122FH consists of a transmitter and a receiver.The transmitting terminal simultaneously collects standard 4-20mA current signal and switch signal, and transmits it through full digital wireless mode.It can enter display instruments, warning lights, PLC or DCS and other equipment and drive industrial equipment such as solenoid valves and frequency converters.

At present, industrial-grade long-distance wireless transmission devices have been widely used in complex and harsh industrial occasions such as cement, smelting, power generation, coal, chemical industry, etc. The functions that can be realized are:Start and stop of water pump; wireless communication between local control station and PLC of large mobile machines such as stacker-reclaimer and unloader;Wireless control of car dust removal system.

Second, parameters and performance

◆ It can directly replace the wired cable to realize long-distance wireless acquisition and transmission of analog or switch value

◆ 4-16 channels of 4-20mA analog signal or 0～5V voltage signal input and output

◆ 4-16 switch input and output channels

◆ It can realize point-to-point communication, and it is also suitable for point-to-multipoint and inconvenient ditching and wiring applications.

◆ No need to write a program, it can be used simply by wiring; no card is inserted, no traffic

◆ There are 4 options for effective wireless transmission distance: 200m, 1km, 3km, 20km

◆ DC voltage 9-24V power supply, the average working current is less than 50mA

◆ PVC plastic shell, E-type guide rail slot installation, rain-proof metal chassis for long distances

◆ 20 years of industrial field operation test to ensure long-term operation in various harsh industrial environments

◆ Low power consumption, which can save a lot of electricity and equipment maintenance costs for enterprises every year

Three, application scenarios

Application scenario 1: Wireless monitoring of hot blast valve and boiler liquid level of waste heat power generation system

In the waste heat power generation system, the DCS system in the control room needs to monitor the temperature and pressure of the boiler and sub-system equipment in real time, and remotely control the valve position switch of the cement line hot air valve through wireless means.Because the sensor data to be collected is scattered and the distance is different, the system designer believes that it is easier to transform by using wireless transmission.The wireless mixed signal transmitter DTD120FHC is installed in the DCS system to transmit the collected analog data to the DCS system. After the DCS system processes the data, it outputs the control signal for the valve position switch of the hot blast valve.

Application scenario 2: wireless communication system between coke cart and ground dust removal station

Because the coke pusher is a mobile device, it is inconvenient for wiring, so the two coke pushers in the dust removal control system, the ground dust removal station, the fan start and stop, high and low speed feedback signals and the coke pusher walkingThe signal establishes communication wirelessly, thus replacing the manual walkie-talkie and manual control.In detail, the bidirectional mixed-signal wireless transmission device DTD122FHEY can be used to meet the requirements.

The driver of the coke pusher can receive the fan speed from the coke pusher monitoring room.When the dust removal operation is required, a high-speed fan operation request is issued to the central control room, and the central control room PLC determines whether to execute it. After the fan is running at a high speed, the high-speed signal is fed back to the two coke pushers.The command light changes.This not only solves the problem of communication between the coke pusher and the dust removal fan, but also solves the problem of dust removal coordination between the two coke pushers, which improves the safety and timeliness of operation.