Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual PLC Bits, Nibbles, Bytes, Words, etc

2. Programming Concepts

2.6PLC Bits, Nibbles, Bytes, Words, etc

For different control purposes, there are five types of values inside DVP-PLC for executing the operations.

Numeric	Description
Bit	Bit is the basic unit of a binary number system. Range is 0 or 1
Nibble	Consists of 4 consecutive bits, e.g. b3~b0. Range 0 ~ 9 in Decimal or 0~F in
	Hex
Byte	Consists of 2 consecutive nibbles, e.g. b7~b0. Range 00 ~ FF in Hex
Word	Consists of 2 consecutive bytes, e.g. b15~b0. Range 0000 ~ FFFF in Hex
Double Word	Consists of 2 consecutive words, e.g. b31~b1. Range 00000000 - FFFFFFFF
	in Hex

Bit, nibble, byte, word, and double word in a binary system:

		W1	DW		W0			Double Word
								Word
	BY3		BY2		BY1		BY0	Byte
NB7	NB6	NB5	NB4	NB3	NB2	NB1	NB0
								Nibble
								Bit

2.7Binary, Octal, Decimal, BCD, Hex

For fulllfilling different kinds of internal manipulation, DVP-PLC appies 5 foramts of number systems. Each number system has its specific purpose and function described as below.

1.Binary Number, (BIN)

PLC internally calculates, operates, and stores the value in Binary format.

2.Octal Number, (OCT)

The external I/O points of DVP-PLC are numbered in octal format.

e.g.

External inputs: X0～X7, X10～X17, …, X377. (No. of device)

External outputs: Y0～Y7, Y10～Y17, …, Y377. (No. of device)

3.Decimal Number, (DEC)

DVP-PLC appies decimal operation in situations below:

zSet value for timers and counters, e.g. TMR C0 K50. (K value)

zNo. of S, M, T, C, D, E, F, P, I devices, e.g. M10, T30. (No. of device)

zFor use of operand in API instructions, e.g. MOV K123 D0. (K value)

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