We have a circular array of 50  storage shelves that move bi-directionally and  have a shelf 1,  proximity sensor.  We  need I need to implement an up/down counter that will wrap back to 0 when counting up and wrap from 0 to 50 when counting down.  It also has to reset when the self 1 sensor is hit.  This value is then used to indicate the shelf number on the display.

Is there an easy way to do this that I am missing, given the up/down counter block available ?  I can get the counter to wrap in one direction, using the "start value" and "on" parameter, but getting it to work in both directions is an issue. 

hello Ackerbob,

this is not easy to implement in terms of circuitry with a few blocks. However, this was already a topic in the German part of the forum, for which there are also some solutions.

LOGO!-Im Kreis zählen lassen_Vor- und Rückwärts

greeting Ella_68

Hi Ella_68,

Thanks for the reference to the German side.  It confirmed the I was not going crazy.

For future reference I have attached the solution, in English with some annotations.

Ackerbob