  PKS 2155-304 is one of the brightest blazar located in Southern Hemisphere,
monitored with H.E.S.S. since the first light of the experiment. Here we report
multiwavelength monitoring observations collected during the period of
2015-2016 with H.E.S.S.,Fermi-LAT, Swift-XRT, Swift-UVOT, and ATOM. Two years
of multiwavelength data with very good temporal coverage allowed to
characterize broadband emission observed from the region of PKS 2155-304 and
study potential multifrequency correlations. During the period of monitoring,
PKS 2155-304 revealed complex multiwavelength variability with two outbursts
characterized by completely different multiband properties. The 2015 activity
of the blazar is characterized by a flare observed at all wavelengths studied.
The broadband emission observed during the outburst is well correlated without
any time lags. Contrary to 2015, in 2016, only orphan outburst in the optical
and ultraviolet wavelengths was observed. Such an orphan activity is reported
for the first time for the blazar PKS 2155-304.
