We present the results from the second long-term (six-day) observation of t
he Seyfert 1 galaxy MCG-6-30-15 with ASCA. Owing to extremely good photon s
tatistics, we detected a H-like sulphur (S XVI) edge in addition to the pre
viously reported O VII and O VIII edges. The broad iron emission line with
a red tail is confirmed, We investigated the variability of the iron line f
eature with a timescale of 2 x 10(4) s throughout the observation.