Delta Electronics Programmable Logic Controller DVP-PLC - Manual (Page 34)

2 Functions of Devices in DVP-PLC
DVP-PLC Application Manual
2-6
Memory type
Power
Off→On
STOP→RUN RUN→STOP
Clear all non-latched
area (M1031)
Clear all latched
area (M1032)
Default
setting
Clear when M1033 = Off
Non-latched Clear Unchanged
Remain unchanged when
M1033 = On
Clear Unchanged 0
Latched Unchanged Unchanged Clear 0
Special M,
Special D,
index register
Initial Unchanged Unchanged
Initial
setting
File Register Unchanged 0
2.2 Values, Constants [K] / [H]
K Decimal form
K-32,768 ~ K32,767 (16-bit operation)
K-2,147,483,648 ~ K2,147,483,647 (32-bit operation)
Constant
H Hexadecimal form
H0 ~ HFFFF (16-bit operation)
H0 ~ HFFFFFFFF (32-bit operation)
For different control purposes, there are five types of values inside DVP-PLC for executing the operations. See
the explanations bellows for the functions and works of every type of value.
1. Binary value (BIN)
All the operations and storage of values in PLC are conducted in BIN. Belows are the terms for BIN values.
Bit:
The basic unit for a BIN value, either 1 or 0.
Nibble: Composed of 4 continuous bits (e.g. b3 ~ b0). Presented as the decimal value 0 ~ 9 of a digit
or 0 ~ F in hex.
Byte: Composed of 2 continuous nibble (i.e. 8 bits, b7 ~ b0). Presented as 00 ~ FF in hex.
Word:
Composed of 2 continuous bytes (i.e. 16 bits, b15 ~ b0). Presented as 4-digit 0000 ~ FFFF in
hex.
Double word: Composed of 2 continuous words (i.e. 32 bits, b31 ~ b0). Presented as 8 digit 00000000 ~
FFFFFFFF.
Bit, nibble, byte, word, and double word in a binary system:
NB0 NB1 NB2 NB3 NB4 NB5 NB6 NB7
BY3 BY2 BY1 BY0
W1
DW
W0
Double Word
Word
Byte
Nibble
Bit
2. Octal value (OCT)
The No. of external input and output terminals in DVP-PLC is numbered in octal system.
For example:
External input: X0 ~ X7, X10 ~ X17…(device No.)