In a letter sent to Robinson, NFL vice president of football operations Merton Hanks noted that "future offenses will result in an escalation of fines up to and including suspension."
NFL Commissioner Roger Goodell was advised of the decision and said "we felt this was the appropriate discipline."
Asked if this was an example of the hits the NFL is trying to get out of the game, Goodell said: "There's no such thing as a perfect example. There are individual elements of each hit. We're trying to identify the techniques that will make our game safer."
The league said Robinson violated Rule 12, Section 2, Article 9 (a) (2) of the playing rules, which states: "It is a foul if a player initiates unnecessary contact against a player who is in a defenseless posture."
The rule notes that players in a defenseless posture include "a receiver attempting to catch a pass; or who has completed a catch and has not had time to protect himself or has not clearly become a runner."
On the play with 6:12 left in the third quarter, the league said Robinson lowered his head and made forcible contact to the head and neck area of Maclin, who still made the catch. He was slow to leave the field but returned to the game.
Robinson can appeal to former NFL coaches Art Shell and Ted Cottrell, who are paid by the league and the NFL Players Association to handle those cases. Their appeal must be heard by the second Tuesday following notification of the discipline.
Replays clearly showed Robinson leading with his helmet, something the league has been adamant about eliminating. The NFL this year also banned players from launching themselves into a defenseless opponent.
"My opinion didn't change," he said Monday before the NFL made its ruling.
Copyright 2011 by The Associated Press