KhangNguyen

Hi All Pro,

I face to a issue rotate 1 bit in many word. Before that i use GE FAnuc PLC, it can rotate 2,3,4,5,6,7... words. So, So for S7 1200, i find ROR instruction for WOrd and Dword.

How do i can rotate above 2 word.

Please give me your experience for this topic.

thanks, 

Khang.

Consider using an array. This is more processor effective to keep the data in position as it is. Then move the read/write pointer around as is needed. Relative to the pointer position, the data seems to rotate.

Is this idea clear to you?

Prior reply relates to a circular buffer (https://en.wikipedia.org/wiki/Circular_buffer )

KhangNguyen

Hi All Pro,

I face to a issue rotate 1 bit in many word. Before that i use GE FAnuc PLC, it can rotate 2,3,4,5,6,7... words. So, So for S7 1200, i find ROR instruction for WOrd and Dword.

How do i can rotate above 2 word.

Please give me your experience for this topic.

thanks, 

Khang.

Search these forums for circular buffer (in the TIA Portal conference).

If it is not in SCL, it probably has bugs in it.  If it is in SCL, it _likely_ has bugs in it - unless it is stated to have been tested on hardware compatible with your specific project.

KhangNguyen

 Hi Sir,

please show me how to program it. Because it is the first time I face to circular buffer.

thanks so much.

Khang.

0_Einstein

Prior reply relates to a circular buffer (https://en.wikipedia.org/wiki/Circular_buffer )

KhangNguyen

Hi All Pro,

I face to a issue rotate 1 bit in many word. Before that i use GE FAnuc PLC, it can rotate 2,3,4,5,6,7... words. So, So for S7 1200, i find ROR instruction for WOrd and Dword.

How do i can rotate above 2 word.

Please give me your experience for this topic.

thanks, 

Khang.