The Positive Transition contact instruction (EU) allows power to flow for one scan for each

off-to-on transition. The Negative Transition contact instruction (ED) allows power to flow for one

scan for each on-to-off transition. For the Positive Transition instruction, detection of a 0-to-1

transition in the value on the top of the stack sets the top of the stack value to 1; otherwise, it is set

to 0. For a Negative Transition instruction, detection of a 1-to-0 transition in the value on the top of

the stack sets the top of the stack value to 1; otherwise, it is set to 0.

For run mode editing (when you edit your program in RUN mode), you must enter a parameter for

the Positive Transition and Negative Transition instructions. Refer to Chapter 5 for more

information about editing in RUN mode.



When there is an input followed by the |P| instruction, everything behind the |P| instruction is run for just one scan.


Best regards,

Wizard

Hello Entrec,


Yes, it should be that simple. The attachment is a test project, which is working in the PLC.

About 'the Stack' perhaps the manual will help explain this.
http://support.automation.siemens.com/WW/view/en/1109582

Figure 6.2 on page 71 explains the functionality of the stack.


Hope this will help you.

Greetings

Wizard