Pegaia

... would be a same that CFC (SIMATIC Classic) uses: build and uses FB for basic functions (Flip-Flops and Edge detection)...

Hi! huggy_d1,

After 4 years, at TIA V13, maybe this can help you-

SET: Set bit array

Description

The "Set bit array" instruction sets the signal state of the bit in a specified area to "1". You use the pointer on the S_BIT parameter to define the starting point of the range. If the pointer points to the memory area of the external I/O, the instruction is not executed. At the N parameter of the instruction, you specify the number of bits to be set in the specified area. When the N parameter has the value "0", calling the instruction has no effect.

Syntax

The following syntax is used for the "Set bit array" instruction:

The syntax of the instruction consists of the following parts:

For more information on valid data types, refer to "See also".

Example

The following example shows how the instruction works:

In the example, the instruction sets 10 bits in the range from M0.0 to M1.1.

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RESET: Reset bit array

Description

The "Reset bit array" instruction resets the signal state of the bit in a specified area to "0". You use the pointer on the S_BIT parameter to define the starting point of the range. If the pointer points to the memory area of the external I/O, the instruction is not executed. At the N parameter of the instruction, you specify the number of bits to be reset in the specified range. When the N parameter has the value "0", calling the instruction has no effect.

Syntax

The following syntax is used for the "Reset bit array" instruction:

The syntax of the instruction consists of the following parts:

Example

The following example shows how the instruction works:

In the example the instruction resets 10 bits in the range from M0.0 to M1.1.

Denilson Pegaia

Hi,

as example, a RS flip flop:

if S=True then
Q:=true;
end if;

if R=true then
Q:=true;
end if;

 Btw

you can write 

IF S THEN

Q:=true;

end_if;

you dont need write in if operator true for bool vars bit if false you need write s=false. 

Using the Rising edge detecting operation the #output will  be True for just one cycle.