We are using 2 ASi safety Monitors to control the one Robot Cell, as there are more than 31 safety slaves. The output OSSD’s of each safety monitor are wired in series so that if either is activated it drops out the main contactor for the whole cell. Both safety monitors edm (external device monitoring)input are wired from the same contactors.
The problem arises when one safety monitor trips the edm is activated on both safety monitors causing a critical error on the safety monitor that has not tripped. How is this problem best addressed? The cell is to be CAT 4 rated.

The purpose of the robot while being included into a production line is not that Master as Tygerdawg and Steve mentioned.ASi robot cells is a new cabling system that allows machinery safety equipment, such as access gate switch interlocks,to operate in parallel with standard machinery controls on a single network with a common communication protocol.