S7-400 H - redundant analog output

Dear members,

I need some help. I have an S7-414 H with redundant analog output over distributed ET-200Ms.
Siemens documents say it's not possible to wire a loop powered instrument to redundant analog input and it must be externally supplied, but they didn't say if it's possible with redundant analog output or not.

I'm just asking if someone could wire a loop powered positioner to a redundant analog output or I have to use external supply between analog output and positioner.

I asked my question here after some useless trials with Siemens technical support.