Adams, a second-round pick in 2012, was seen on the practice field as the Steelers wrapped up their second day of mandatory minicamp. He was not made available to reporters.
"He had an appointment today (and) the appointment went well," Tomlin said. "He's just continuing to take steps to get back out on the field."
Team officials believe Adams will be cleared to resume football activities in about six weeks.
"All of the guys were excited," center Maurkice Pouncey said. "Everybody knows the things he's been through and the times he has look forward to right now in trying to get back."
Adams is expected to be the Steelers' starting right tackle. Last year, his rookie season ended in November after he suffered an ankle injury. In 10 games at right tackle, he allowed seven sacks and 16 quarterback hurries.