This is an unfamiliar approach to me. In instrumentation we normally prefer to only earth on side of the shielded cable to prevent creating additional ground loops. We would run a few hundred control loops in each section and only earth the one side, normally in the marshalling rack at the distribution side and never at the field devices.
Do you recommend running a separate earth cable next to the signal cable and earthing both sides?
The shield or earth is only to get rid of EMF and to keep the signal “Clean”, Its not suppose to act as an earth conductor, the instrument on the one side and the Control system whether a PLC or DCS on the other side, should have their own proper earthing/earth conductor.
EDIT: Wait a minute, I only understood what you said after answering, I gues we are saying the same thing here. I do apologise…