Solving a Mechanics Problem: Equilibrium and Tension in a 160kg Box

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What should be the value of P to maintain the system in equilibrium?
If we just consider the free body diagram of the 160kg box, should the tension be 1600N?(Because there are only 2 forces acting on the box only)
Could any people please help?
 
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Sorry mate...couldn't see your diagram (it doesn't show up).
 
I could not see it either, but according to what you said, you are correct:

IF there are only two forces on an object, and one of them is weight, then the other must be equal to the weight if the object is in equilibrium.