Ten Daily Electronic Common Sense-Section 76

What types of PLC input circuits are usually divided into?

The input circuit of PLC is basically the same, usually divided into 3 types: DC input mode, AC input mode and AC/DC input mode.

What are the inherent technical advantages of long-life miniature OLEDs?

1. Wide viewing angle: Allows a large field of view visual image with a large output aperture.
2. High switching rate: Flicker-free full-motion video display can be obtained.
3. High gray level: able to provide very good color saturation and 256 levels of gray.
4. White light with full spectrum: full-color images with superior picture quality can be obtained.
5. Thin and light: compact, no additional parts are required.
6. Low manufacturing cost.
7. Low power consumption.

What is the relationship between signals and variables?

There are obvious differences between signals and variables, and the differences are mainly reflected in the way of receiving and maintaining signals and the size of the area where information is maintained and transmitted. For example, signals can set the amount of propagation delay, while variables cannot. Variables can only be used as local information carriers, such as only valid in the defined process. Signals can be used as information carriers for modules, such as transferring information between processes in a structure. The setting of variables is sometimes just a transition, and the final information transmission and communication between interfaces are completed by signals. Signals in the synthesized VHDL file will correspond to more hardware structures.

What is conductivity?

Also called conductivity coefficient, it is also a physical quantity to measure the electrical conductivity of a substance. Size is numerically the reciprocal of resistivity, represented by the letters &gamma, in meters/ohms*mm squared.

What is the composition of STIM?What is the composition of STIM?

STIM consists of the standard transmitter itself with internal information including manufacturer, data code, serial number, limit of use, unquantified and calibration factor.

What are the characteristics of the inductor component?

• AC presents impedance.
• The inductor element has the characteristic of preventing the current from changing, so the current flowing through the inductor cannot change abruptly.
• Inductive coils are components made by applying the principle of electromagnetic induction, and are often used in the following situations in electronic products.
• As a filter coil, it can prevent AC interference.
• As a resonant coil, it forms a resonant circuit with capacitors.
• As a load for high-frequency signals in high-frequency circuits.
• Make a transformer to transmit AC signal.
• Using electromagnetic induction characteristics to make magnetic components, such as magnetic heads and electromagnets.

What basic communication protocols are included in the rDA standard?

The IrDA standard includes 3 basic communication protocols: Infrared Physical Layer Specification (IrPHY), Infrared Link Access Protocol (IrLAP) and Infrared Link Management Protocol (IrLMP).

Why is quartz crystal resonator called quartz?

Quartz is the only material with the following set of properties: z Piezoelectric properties (“pressure-electrical properties”). z has zero temperature coefficient cut z has stress compensation cut z low loss (ie high Q value), easy to process. Low solubility in any substance, except fluoride corrosion. Under “normal” conditions, hard but not brittle z is abundant in nature. Easy to grow in large quantities, low cost, high purity and integrity. In artificially grown single crystal quartz, the annual output is more than 3000 tons, and the growth quantity is second only to silicon (as of 1997, the annual growth is 3 to 4 times that of silicon).

Corresponding to the hierarchical structure of the compressed video stream, what is the rate control according to the level of control?

Different control methods such as GOP layer, frame layer, macroblock layer, etc.

What is the working principle of the timer/counter?

1. As a timer principle
2. As a counter principle
3. Count overflow interrupt and counter initial value calculation
4. Gate switch B and gate control bit GATE