Delta Electronics VFD037CH23A-21 — основы числовых систем в PLC: октальная, десятичная и шестнадцатеричная [474/638]

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Chapter 16 PLC Function CH2000 Series

16-21

NB0NB1NB2NB3NB4NB5NB6NB7

BY3 BY2 BY1 BY0

Double Word

Word

Byte

Nibble

Bit

 Octal Number (OCT)

The numbers of external input and output terminal of DVP-PLC use octal number.

Example:

External input: X0~X7, X10~X17… (device number)

External output: Y0~Y7, Y10~Y17… (device number)

 Decimal Number, DEC

The suitable time for decimal number to be used in DVP-PLC system.

 To be the setting value of timer T or counter C, such as TMR C0 K50. (K constant)

 To be the device number of M, T, C and D. For example: M10, T30. (device number)

 To be operand in application command, such as MOV K123 D0. (K constant)

 Binary Code Decimal (BCD)

It shows a decimal number by a unit number or four bits so continuous 16-bit can use to represent the

four numbers of decimal numbers. BCD code is usually used to read the input value of DIP switch or

output value to 7-segment display to be display.

 Hexadecimal Number (HEX)

The suitable time for hexadecimal number to be used in DVP-PLC system.

 To be operand in application command. For example: MOV H1A2B D0. (constant H)

 Constant K:

In PLC, it is usually have K before constant to mean decimal number. For example, K100 means 100

in decimal number.

Exception: The value that is made up of K and bit equipment X, Y, M, S will be bit, byte, word or

double word. For example, K2Y10, K4M100. K1 means a 4-bit data and K2~K4 can be 8, 12

and 16-bit data separately.

 Constant H:

In PLC, it is usually have H before constant to mean hexadecimal number. For example, H100

means 100 in hexadecimal number.