Beckhoff EL5021 Modification: 1 V_pp and 11 µA_pp multi signal input

Hello all

I recently briefly mentioned my EL5021 modifications in my Maho MH400E retrofit discussion. Due to three additional terminals requiring the same modification, I decided to write a guide on how to modify the Beckhoff EL5021 encoder input terminal for both 1 V_pp as well as 11 µA_pp signals (and in theory TTL signals too - untested).

For anybody who's interested, the detailed guide can be found over on GitHub:
github.com/PedPEx/EL5021_multi-signal-mod

A video of a modified EL5021 reading 11 µA_pp signals from a Heidenhain LS403 linear glass scale is also available on YouTube:


If you have any further questions or suggestions, feel free to open an issue, reply here, or write me an email.