Chapter 14 PLC Function
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C200 Series
14-21
NB0
NB1
NB2
NB3
NB4
NB5
NB6
NB7
BY3
BY2
BY1
BY0
W1
DW
W0
Double Word
Word
Byte
Nibble
Bit
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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)
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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)
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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 number. BCD code is usually used to read the input value of DIP switch or
output value to 7-segment display to be display.
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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)
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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.
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Constant
H:
In PLC, it is usually have H before constant to mean hexadecimal number. For example, H100
means 100 in hexadecimal number.
The Function of Auxiliary Relay
There are output coil and A, B contacts in auxiliary relay M and output relay Y. It is unlimited usage
times in program. User can control loop by using auxiliary relay, but can’t drive external load directly.
There are two types divided by its characteristics.
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