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The I/O expansion units are used to extend the number of I/O modules.
Each expansion unit consists of a Power supply and a Back Plane with 4, or 5 or 8 or 9 Serial I/O Expansion Slots.
The I/O expansion units, 87K4, 87K5, 87K8, 87K9 are equipped with a 115.2K bps RS-485 bus which links the expansion unit to the main control unit.




I/O Expansion Unit   Selection Guide
Model Description CPU Slot Power
Supply
COM
Port
I/O Module
Supported
87K4 I/O
Expansion Unit
4 Slot I/O
Expansion Unit
None 4 20W (Note1) Serial I/O
Module only
87K5 I/O
Expansion Unit
5 Slot I/O
Expansion Unit
None 5 20W (Note1) Serial I/O
Module only
87K8 I/O
Expansion Unit
8 Slot I/O
Expansion Unit
None 8 20W (Note1) Serial I/O
Module only
87K9 I/O
Expansion Unit
9 Slot I/O
Expansion Unit
None 9 20W (Note1) Serial I/O
Module only
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