SFC21 max area

Hello,

Is there max area how wide DB can be filled with SFC21?

 there is no limitation in theory , but there are limitations in actual S7-300/400 case, they are:

1. Memory limitation of CPU that can not hold a giant DB .
2. Cycle of CPU will have an dangerous overshoot, that in worst case may end the CPU in STOP mode.
3. Consistency of data transfer because filling operation can be interrupted by high prior tasks (OBs).

I hope it helps,

hdhosseini