Omron CS1D DUPLEX SYSTEM - 10-2009 Operation Manual page 492

Replacement of Expansion Units
1,2,3...
456
1. Disconnect the Connecting Cables from the Unit being replaced.
Replace
Note Before replacing an Expansion Unit, verify that the other Expansion
Unit in the Rack is operating normally by checking the Duplex Com-
munications Cable Error Flags in A270 as well as the LED Indica-
tors on each Expansion Unit.
2. Remove the old Expansion Unit and mount the new Expansion Unit.
Note When removing and mounting a Unit, move the Unit smoothly so
that it is not disconnected/reconnected repeatedly. After mounting
a Unit, secure it by tightening the mounting screws to the proper
torque.
Section 11-6
Remove cables
from Unit being
replaced.