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6. Daily Maintenance and Periodic Inspection and Maintenance
6.3 Replacement Methods
III-46
(2) Base I/O unit
The base I/O unit is generally installed on the electric cabinet side.
(a) Replacement procedures
Always replace the base I/O unit with the machine power turned OFF.
1) Check that the machine power is turned OFF. (If the power is not OFF, turn it OFF.)
2) Open the electric cabinet door.
3) Disconnect all cables connected to the base I/O unit.
4) Remove the screws fixing the base I/O unit to the electric cabinet, and remove the base I/O unit from
the electric cabinet. (Loosen the two lower fixing screws first, and then remove the two upper fixing
screws while supporting the unit with a hand. Then lift the unit upward and off. The two lower fixing
screws do not need to be removed.)
5) Replace with a new base I/O unit, and fix the unit onto the electric cabinet with the fixing screws.
6) Connect all cables connected to the base I/O unit. (Connect the cables to the designated connectors.)
7) Check the cables and wires for connection leaks, faulty connections, etc., then close the electric
cabinet door.
Fixing screws (4 screws)
Base I/O unit
Electric cabinet
Incorrect connections may damage the devices, so connect the cables to the specified
connectors.
Do not replace the base I/O unit while the power is ON.
Do not connect or disconnect the connection cables between each unit while the power
is ON.
CAUTION