Herald:
Thank you for your assistanc, I really appreciate it. I re-scanned the photo at 1200 dpi and zoomed in on the writing, and managed to read "Jo...Jac...Schad". I also read the Roman numeral MDCCXXXVI, which is 1736. I assume this is his death year. I found the attached website which has records from the Ulm archives which lists the Schad family, including a Johan Jacob Schad who died in 1736. The opening page of the website, which will download a pdf of the list, shows the family crest, which is the top part of the Totenschild.
http://www.ulm.de/sixcms/media.php/29/Familienarchiv%20Schad%20-%20Akten%20und%20Amtsb%FCcher.pdfAll I need now is to learn what the rest of the plaque says.