First scan bit in Klockner Moeller EASY PLC

hello Gentelmans,
Is there a first scan bit in Klockner Moeller EASY PLC?

If there isn't, make yourself one....

|                         B          A       |

|--------------------+---|/|--------( )--+---|

|                    |                   |   |

|                    |               B   |   |

|                    +--------------( )--+   |

"A" will only be true on the first scan

Thanks a lot daba, works great.
Simple, and isn't it universal?

Universal only if the bits used on the A and B outputs are "non-retentive" through a power-cycle, or operating mode change.

On Allen-Bradley PLCs, a "pre-scan" automatically resets all non-retentive outputs, resets non-retentive timers, etc.

This must happen in order for A to be turned on on the first "proper" scan following the pre-scan.

On some makes of PLCs, you have a choice of retentive bit memory, and non-retentive bit memory. Of course you would need non-retentive memory for A and B.

If all of your internal bits are retentive, then you would definitely need a "first-scan" status bit from the processor, and there'd be no need to "roll-your-own".

Understood. Thanks again for such complete and excact axplication.