Memory requirements

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The blocks in your circuit program require a certain amount of memory space. The table shows you how much of the memory space each block occupies.

Memory space required for data backup after power failure is specified in the "Rem" column (retentivity enabled).

 

Block

RAM
(Bytes)

Rem
(Bytes)

AND (with/without edge evaluation)

12

-

NAND

12

-

OR (with/without edge evaluation)

12

-

NOR

12

-

XOR

8

-

NOT

4

-

On delay

8

3

Off delay

12

3

On/off delay

12

3

Retentive on delay

12

3

Wiping relay

8

3

Edge-triggered wiping relay

16

4

Asynchronous pulse generator

12

3

Random generator

12

-

Stairway lighting switch

12

3

Multiple function switch

16

3

Weekly timer

20

-

Yearly timer

12

-

Up/down counter

28

5

Hours counter

28

9

Analog threshold trigger

16

-

Analog trigger

16

-

Analog differential trigger

16

-

Analog comparator

24

-

Analog value monitoring

20

-

Analog amplifier

12

-

Pulse width modulator (PWM)

24

-

Analog math

20

-

Analog math error detection

12

1

Latching relay

8

1

Pulse relay

12

1

Message text

8

-

Softkey

8

2

Analog multiplexer

20

-

PI Controller

40

2

Ramp control

36

-

Shift register

12

1

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0BA0-0BA3: The following specifications apply:

The blocks in your circuit program require a certain amount of memory space. The table below shows you how much memory space the blocks use in the various memory areas:

 

Block

Par

RAM

Timer

REM

Basic functions

0

0

0

0

On delay

1

1

1

0

Off delay

2

1

1

0

On/off delay

2

1

1

0

Retentive on delay

2

1

1

0

Wiping relay

1

1

1

0

Edge-triggered wiping relay

1

1

1

0

Symmetrical pulse generator

1

1

1

0

Asynchronous pulse generator

3

1

1

0

Random generator

2

1

1

0

Stairway lighting switch

1

1

1

0

Dual-function switch

2

1

1

0

Weekly timer

6

2

0

0

Yearly timer

2

0

0

0

Up/down counter*

2

(2)

0

(2)

Hours counter

2

0

0

4

Threshold trigger

3

3

1

0

Analog trigger

4

2

0

0

Analog comparator

3

4

0

0

Latching relay*

0

(1)

0

(1)

Pulse relay*

0

(1)

0

(1)

Message texts

1

0

0

0

Softkey*

1

(1)

0

(1)

 

*: Depending on whether the function is configured with or without retentivity, it occupies the following memory space:

Here you will find information on memory space provide by LOGO!.