Camilla is recovering from a chest infection after falling ill following her long-haul trip to Australia and Samoa.
The First Minister laid a wreath outside Edinburgh city chambers during a ceremony involving veterans and serving personnel.
It is the first time the Princess of Wales has carried out two consecutive days of engagements this year following her surgery and cancer diagnosis.
Her speech will come against a backdrop of criticism from the hospitality sector about changes to national insurance contributions.
Hundreds of veterans, serving personnel and members of the public have marked Remembrance Sunday at the National Memorial Arboretum in Staffordshire. The British Army Band Catterick performed for the ...