Signal isolator realizes surveillance and control need to use system of all sorts of automation appearance, control and actuator in industrial production process. The signal between them is transmitted have already faint the small signal to millivolt class, microamper class, have a few hot season again, count kilovolt, hundreds big signal even; Have signal of low frequency dc already, also signal of high frequency pulse is waited a moment, after making a system, often discover between appearance and equipment signal transmits mutual interference, cause a system to be not stabilized operate by accident even.

 

Working principle

 

Signal isolator is isolating device of a kind of signal, will input only way or two-way electric current or voltage signal, change the only way that sends output segregation or the electric current with linear two-way or voltage signal, improve the electric segregation performance between input, output, power source. The signal that receives PLC above all, pass commutation of semiconductor device modulation, undertake keeping apart changeover through parts of an apparatus of smooth feeling or magnetism feeling next, before undertaking demodulation commutation answers segregation again next former signal or different signal, undertake keeping apart handling to the power supply source of the signal after segregation at the same time, assure to become independent absolutely between the signal after commutation, power source, ground. Date can encounter various interference in transmission process, to make sure signal is stable, use signal isolator is attached most importance to especially should.

 

 

Function

 

One, the control loop with inferior protection.

 

2, the influence of noise of disappear weak environment to testing circuit.

 

3, restrain a powerful person of communal ground connection, transducer, electromagnetism and unidentified pulse the interference to equipment; The function that has voltage limiting, forehead shedding to inferior equipment at the same time is to change send implement, what PLC/DCS of a powerful person of appearance, transducer, electromagnetism inputs output and communication interface is faithful defend. Structure of DIN series slideway, install easily, can keep apart the potential between input, output and power source and earth effectively. Can overcome transducer noise to reach all sorts of tall low frequency pulsatile interference.

 

Type selecting problem

 

Isolator is located in between 2 systems passageway, so choice isolator should decide the input outputs a function above all, want seclude at the same time implement the input outputs mode (power supply of region of flow pattern of electric profiling, report, annulus etc) get used to around to carry passageway interface mode, in addition still communication of intensity of precision, power comsumption, noise, insulation, bus line waits for a lot of important parameter to involve product function, for example: Noise and precision are concerned, power comsumption energy and dependability are concerned, the person that these need are used careful anthology. Anyhow, price of sex of applicable, reliable, product compares the main principle that is choice isolator.

 

Structure of slideway of series of standard, install easily, can keep apart effectively; Input, output and electromagnetism a powerful person reach the potential between the earth, can overcome transducer noise level all sorts of tall low frequency are pulsatile interference.

 

Action

 

1, signal isolator can open input signal and output signal segregation come. This is a of signal isolator main function, after use signal isolator, on one hand, it can very good settlement the mutual interference between annulus road and equipment, on the other hand also can effective elimination the interference of a few electromagnetism of bound of China and foreign countries of line transmission process.

 

2, signal isolator can avoid the conflict between power source effectively. A lot of device often can be used in industrial production, and general mechanical equipment needs to work below the environment that has power supply, and power source more than 1 often can create conflict, affect the regular job between each equipment greatly, after use signal isolator OK and effective settlement this problem, make the job of each equipment in an orderly way.

 

3, signal isolator can undertake to a few equipment signal segregation allocates. A lot of equipment often can contain a few load, this should use resistor and lead inevitably to wait, but usually lead length often can affect the resistor of equipment, resistor changes the voltage that can affect whole facility again, can solve good above with signal isolator all sorts of problems.

 

With the distinction that distributes electric equipment

 

The working principle of distribution isolator is industrial spot needs to use two lines to make transmission way commonly, should send to change already implement wait for appearance to provide 24V distribution power source, the voltaic signal that wants pair of inputs again at the same time undertakes collection, enlarge, operation, and after undertaking interference rejection is handled, the electric current that reexport keeps apart and voltage signal, use for 2 appearance from the back or other appearance. Its character has change send implement offer driving voltage 16.5 ～ 28V. Will change send implement segregation of signal of 4 ～ 20mA is deferent. Can choose 4 ～ 20mA or output of signal of 1 ～ 5V, or the dc signal that other place needs, modular the design that express core, need not mix at 0 o’clock spend completely adjust. Contain indicator light of working power source. Only channel, input all the way output all the way, input protection of loop short circuit. Insert namely unplug namely type wiring terminal, DIN slideway blocks type installation

 

Signal isolator is to will input only way or two-way electric current or voltage signal, change the only way that sends output segregation or the electric current with linear two-way or voltage signal, improve the electric segregation performance between input, output, power source.

 

With the distinction of safe bar

 

Signal isolator is main the function is signal segregation; Safe bar is told commonly is bar of segregation type safety, still be this watch that bring appearance to offer this installing besides signal isolating function loop, have the effect of explosion proof.

 

The distinction of passive and active

 

Passive signal isolator does not need power supply of independent power source, can take report from input side, also can use loop power supply, the input outputs segregation. Of active is the DC24V of power source power supply that isolator need becomes independent or AC/DC220V, those who output laden ability to compare passive is strong, had better choose the signal isolator of active so.