The Canadarm2, or Space Station Remote Manipulator System (SSRMS) is a new generation Canadarm, the first component of the Mobile Servicing System (MSS) was launched on STS-100 early in the station's assembly sequence. Canadian Astronaut Col. Chris Hadfield performed two EVA's or space walks to assemble Canadarm2 on-orbit.

The station arm has the new capability to move around the station's exterior like an inchworm. Each end of the arm is equipped with a specialized mechanism called a Latching End Effector (LEE) that can lock on one of many special fixtures, called Power Data Grapple Fixtures (PDGF), then detaching its other end and pivoting it forward. The range of accessibility of the SSRMS will be limited only by the number of PDGF's strategically installed on the station. The LEE is designed to provide power and data signals at both ends of the arm. 

Unlike the Canadarm, the Canadarm2 stays in space for its useful life. This requirement necessitates an innovative design feature which allows astronauts to repair it on-orbit. The Canadarm2 is built in sections called Orbital Replacement Units (ORU's) which are easily removed and then replaced by either an astronaut or the Special Purpose Dexterous Manipulator. 

Canadarm2 is equipped with four TV cameras that feed wide and close-up views to the operators of the Canadian-built robotics, and an advanced vision system which has the ability to track payloads, and can sense various forces and moments to ensure smooth movement of payloads. The station arm also has a collision-avoidance capability. Two sets of cameras are mounted on the booms, one set on each side of the elbow joint. The remaining two sets of cameras are on the latching end effectors (one set on each LEE).

Technical Details

Width	2.2m
Length	17.6m
Mass (approx)	1,800Kg
Mass Handling Capacity	100.000Kg
Degrees of Freedom	7
Peak Power	2000 Watts
Average Power	1360 Watts
Stopping Distance (under max. load)	0.6m