There is Vcm in datasheet which is ?10.5V to +10.5V. Does this mean that I
can't input voltages greater then 10.5V but less then Vs ?
The input voltage range of the OP285 is +/-10.5 V, when used with +/-15Volts.
We always spec the input voltage range as the input common mode range of the
device - so you need to operate the device, such that when feedback is settled
, the common mode voltage is less than +/-10.5Volts.