The three output types of PLC are: transistor output, thyristor output and relay output, what is the difference between these three different output types?
(1) Transistor output:
The biggest advantage is that it is suitable for high-frequency action, and the response time is short, generally about 0.2ms, but it can only carry DC5-30V load, and the maximum output load current is 0.5A/point, but every 4 points shall not be greater than 0.8A.
(2) Thyristor output:
It can be 0.2A/point with load, and can only be with AC load, which can adapt to high-frequency action, and the response time is 1ms.
(3) Relay output:
The advantage is that different AC and DC loads can be carried between different common points, and the voltage can also be different, and the load current can reach 2A/point; However, the relay output method is not suitable for high-frequency operating loads, which is determined by the lifetime of the relay. Its life decreases with the increase of load current, generally between hundreds of thousands of times and Jl million times, and some companies' products can reach more than 10 million times, and the response time is 10ms.
When the output frequency of your system is less than 6 times per minute, the relay output should be preferred, because of its simple circuit design, anti-interference and load-bearing power. When the frequency is less than 10 times/min, the relay output mode can be selected; PLC output can also be used to drive the Darlington triode (5-10A), and then drive the load, which can be greatly reduced.
ADVANTAGES OF TRANSISTORS: THE OPERATING FREQUENCY CAN REACH HUNDREDS OF KHZ, AND THERE IS NO CONTACT, SO THERE IS NO SUCH THING AS MECHANICAL LIFE;
Defects: It can only be connected to DC load (generally below DC30V), and the current is relatively small;
Triac (thyristor output): It can only be connected to the AC load, the action frequency is relatively high, and the life is long, but the rated current of the load is also relatively small
Advantages of relays: both AC and DC loads can be driven; The rated current of the load is large;
Defects: the action frequency can not be too high, and the relay has a lifetime, generally 1 million times;
The transistor is primarily used for positioning and manipulation, and the output of the crystal is used to announce the pulse. The relay cannot be used to announce the pulse, so it cannot be positioned and controlled. If you use a relay to control the positioning servo or stepper, you need to add a positioning module, which is not cost-effective. With a single transistor output, you can control the servo, etc. That's it. According to the requirements of the production process, the transistor output should be selected for the abort of various indicator lights and frequency converters/digital DC governors, which is suitable for high-frequency action and has a short response time; If the output frequency of the PLC system is less than 6 times per minute, the relay output should be preferred, and the design of the output circuit is simple, and the anti-interference and load can be strong.
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