The Saar 5 vessles are equiped with Phalannx.
The missile was giuded in, probably passively, from the stern. Probably came in low and fast, menaing there was a very short window of opportunity to engage, unless data linked sources caught the threat wwell in advance. Apparantly they didn;t and the vessel had no time to bring its systems, including the Phalanx, to bear.
I see. Now that the Israelis know what they are up against, I expect it to be a lot harder for the Iranians to successfully attack them.
On another note, I bet the U.S. Navy is extremely interested in this.
Phalanx probably was used, but its a last ditch weapon, has approx. 3-5 second response time before impact.