Low-voltage electrical and low-voltage electrical technology 9 Electrical knowledge is closely related to the clock

This clock is non-clock

The problem map is a clock, it has been published in Mong Point Electrical technology forum.

This clock is closely related to electrical knowledge.

However, the original clock in the 4-point reading error, I corrected it.

Now, let's uncover the secrets of this clock.

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One o'clock

The time of the clock is B'L. What does that mean?

B'L = 1011'L = 1, that is, the first a0 bit on the right.

We know that in the switch logic design will encounter hexadecimal numbers, they are:

"0,1,2,3,4,5,6,7,8., 9, A, B, C, D, E, F".

The decimal numbers for these numbers are:

"0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15".

Visible B is 11. We use binary to express 11 is 1011, subscript L said the low, that is, the right-a0, the value is 1.

Correspondence between hexadecimal code, binary code, decimal code and ASCII code is as follows:

Pay attention to the 1011 corresponding to the penultimate line B above. It's bit 0 is equal to "1", that is one o'clock.

Hexadecimal code in the PLC RS485 / MODBUS-RTU bus data communication is widely used. For example, the following communication frames:

"0B00640600DC00DA00DD504B"

The meaning of this communication frame is: In the power meter with ID address 0BH (11), there are data in 3 consecutive words starting from 0064H (100), data occupying 06H (6 bytes) in total, and the data contents are respectively Is: 00DCH (220V), 00DAH (218V), 00DDH (221V), the back of the 5048H four digital CRC check code.

This communication frame reads the three phase voltage values, 220V, 218V and 221V respectively.

Two o'clock

What does this expression mean? We look at the following formula:

This is the sum of a series of numbers. The first item in the sequence is 1, then 1/2, 1/4, ..., etc., the total ratio is 1/2, and the sum of the numbers is 2, which is two o'clock.

Let's imagine: We use a series of resistors in series, of which the first resistor is 1 ohm, the second resistor is half the first half is 0.5 ohm, the third resistor is half the second 0.25 ohm, ..., the number of resistors is infinite, then what is the final value of the resistor in series? The answer is 2 euro.

Three o'clock

3 = 3, ASCII 3, see the table at one o'clock.

We know that power meters, circuit breakers trip, follow the device widely used RS485 communication interface to MODBUS communication protocol to send information. MODBUS communication protocol, there are two types of digital expressions. The first category is called RTU format, which is hexadecimal format; the second category is ASCII code.

The ASCII code is determined by the International Organization for Standardization based on the data format of the United States. The correspondence between ASCII codes and decimal numbers is:

Decimal format: 0,1,2,3,4,5,6,7,8,9.

ASCII format: 30,31,32,33,34,35,36,37,38,39.

So: 3 = 3, that is, ASCII 3.

Remind: MODBUS communication protocol, if the number using RTU format, it was named MODBUS-RTU; if the data format is ACSII code, it was named MODBUS-ASC. The former is more common, is the standard communication protocol.

ASCII code used in the PLC's RS485 / MODBUS-ASC data communication frame.

Four o'clock:

32mod7, said to use 32 to remove the remainder of the 7, the remainder is 4, that is, four o'clock.

five o'clock:

Here is the golden section number, in a wide range of applications in all walks of life.

For electrical systems, one of the simplest examples is that the ratio of the width to the length of a molded case circuit breaker corresponds to the golden section relationship, in which case the visual effect is the most

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