A:Answer Without a model number, it's impossible to say for sure.
From the product specifications, this mounts supports UP TO VESA 600x400. This means the mounting holes on the back of your TV (four holes in a square/rectangular pattern) can be UP TO 600mm (roughly 23.5 inches) apart horizontally and UP TO 400mm (roughly 15.75 inches) apart vertically.
Plasma TVs are heavy. Make sure you use sufficiently large lag bolts to mount to studs in your wall, as well as sufficiently long machine screws to mount the arms to the back of your TV.