Addressing I/O and Controller Memory

4-13

 

 

Addressing File Types

The following two tables show the available file types and the amount of memory used by each.

Data Table File Types and Memory Usage for PLC-5 Controllers Series E/Revision D and Later

File Type

File-Type

File

Maximum Size of File

 

 

Memory Used in

Memory Used

 

Identifier

Number

16-bit Words and Structures

 

Overhead for Each

(in 16-bit Words)

 

 

 

 

 

 

 

File

per Word,

 

 

 

PLC-5/11,

PLC-5/30

PLC-5/40,

PLC-5/60,

 

 

 

(in 16-bit Words)

Character, or

 

 

 

-5/20,

 

-5/40E,

-5/60L,

 

 

 

 

 

Structure

 

 

 

-5/20E

 

-5/40L

-5/80, -5/80E

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Output image

O

0

32

64

128

192

6

1/word

 

 

 

 

 

 

 

 

 

Input image

I

1

32

64

128

192

6

1/word

 

 

 

 

 

 

 

 

 

Status

S

2

128

128

128

128

6

1/word

 

 

 

 

 

 

 

 

 

Bit (binary)

B

31

2000 words

 

 

 

6

1/word

Timer

T

41

6000 words/2000 structures

 

6

3/structure

Counter

C

51

6000 words/2000 structures

 

6

3/structure

Control

R

61

6000 words/2000 structures

 

6

3/structure

Integer

N

71

2000 words

 

 

 

6

1/word

Floating-point

F

81

4000 words/2000 structures

 

6

2/structure

ASCII

A

3-999

2000 words

 

 

 

6

1/2 per character

 

 

 

 

 

 

 

 

 

BCD

D

3-999

2000words

 

 

 

6

1/word

 

 

 

 

 

 

 

Block-transfer

BT

3-999

12000 words/2000 structures

 

6

6/structure

 

 

 

 

 

 

 

Message

MG

3-999

32760 words/585 structures2

 

6

56/structure

PID

PD

3-999

32718 words/399 structures2

 

6

82/structure

SFC status

SC

3-999

6000 words/2000 structures

 

6

3/structure

 

 

 

 

 

 

 

ASCII string

ST

3-999

32760 words/780 structures2

 

6

42/structure

Unused

--

9-999

6

 

 

 

6

0

 

 

 

 

 

 

 

 

 

1This is the default file number and type. For this file type, you can assign any file number from 3 through 999.

2The maximum size of a data table file is 32K words. The maximum size of the entire data table is 64K words

Publication 1785-UM012D-EN-P - July 2005

Page 57
Image 57
Bradley Smoker PLC-5 user manual Addressing File Types