The Embedded Local Monitor Board (ELMB) is a microcontroller based plug-in module using
the CANopen communication protocol. It has been widely used in LHC systems and experiments
for slow-control and monitoring purposes, providing multiple, galvanically isolated analog inputs,
and multiple digital inputs and outputs. While the module showed excellent performance in the
past 15 years, a new design is deemed necessary due to the obsolescence of some components of
the existing ELMB and the higher radiation tolerance required for the planned HL-LHC upgrade.
Three development paths, one fully backward compatible and two conceptually different solutions
with different levels of radiation tolerance are presented.