Advant 450 AMPL problem with DEMUX-MI
I see that there is small problem with AMPL block called DEMUX-MI - demultiplexer with memory. I looks like this block is loosing memory from time to time without reason. At the blocks inputs I have putted permanently 1 for input named S and 0 for inputs named L and R so there is no way to loose vaules at the outputs right?
It happens very rare (like once a year) but sometimes cause a problems.
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Yes, your settings for the MUX are correct and the mux should execute every program cycle. If ProductNo is invalid then the block should select A0
Are you absolutely sure the the CONTRM or PCPGM that contains this element is not being reset?
This would cause the exact behaviour you are seeing and is a more likely cause.
However, I have once observed a problem where a time based AMPL element did not execute correctly and would randomly fail like this. The cause was that we had made "too many" on-line changes to the program. Deleting and re-translating the PCPGM from source code resolved that problem.