Delta DVP32ES300T User Manual (English)

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Chapter 5 CPU and Module Devices

5-5

5.2. CPU Device Functions

The following flow chart shows the procedure for processing a program in the PLC.

Input terminal X

Device memory

Processing the program

Device memory

Regenerating the output signal

and sending it to the output terminal

Regenerating the input signal

Device memory

 Regenerating the input signal

1. Before the program is executed, the state of the

external input signal is read into the memory location

for the input signal.

2. When program is executed, the state in the memory

location for the input signal does not change even if

the input signal changes from ON to OFF or from OFF

to ON. The input signal is not refreshed until the next

scan begins.

 Processing the program

After the input signal is refreshed, the instructions in the

program are executed in order from the start address of the

program. The results are stored in the device memory.

 Regenerating the state of the output

After the instruction END is executed, the state in the

device memory is sent to the specified output terminal.

5.2.1 Values and Constants

Name

Description

Bit

A bit is the basic unit in the binary system. Its state is either 1 or 0.

Nibble

A nibble is composed of four consecutive bits (for example b3–b0). Nibbles

can represent 0–9 in the decimal system, or 0–F in the hexadecimal system.

Byte

A byte is composed of two consecutive nibbles ( 8 bits, b7–b0). Bytes can

represent 00–FF in the hexadecimal system.

Word

A word is composed of two consecutive bytes (16 bits, b15–b0). Words can

represent 0000–FFFF in the hexadecimal system.

Double word

A double word is composed of two consecutive words (i.e. 32 bits, b31–b0).

Double words represent 00000000–FFFFFFFF in the hexadecimal system.

The relation among bits, nibbles, bytes, words, and double words in the binary system is shown in the picture below.

b31b30 b29 b28 b27b26 b25 b24

b23

22 b21 b20b19 b18 b17 b16 b15b14

b13

b12b 11 b10

b9 b8

b5 b4

b2 b1 b0

NB0NB1NB2NB3NB4NB5NB6NB7

BY3 BY2 BY1 BY0

Double word

Word

Byte

Nibble

Bit

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Delta DVP32ES300T Specifications

General

Model	DVP32ES300T
I/O Points	32
Digital Inputs	16
Digital Outputs	16
Power Supply	24V DC
Communication Ports	RS-232, RS-485
Program Capacity	16k Steps
Operating Temperature	0°C to 55°C
Storage Temperature	-25°C to 70°C
Input Type	24 VDC Sink/Source
Controller Type	Programmable Logic Controller
Output Type	Transistor
Dimensions	90 x 120 x 90 mm
Humidity	5% to 95% RH (non-condensing)