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Model
87K4 I/O
Expansion Unit
87K5 I/O
Expansion Unit
87K8 I/O
Expansion Unit
87K9 I/O
Expansion Unit
4 Slot I/O
Expansion Unit
5 Slot I/O
Expansion Unit
8 Slot I/O
Expansion Unit
9 Slot I/O
Expansion Unit
Serial I/O
Module only
Serial I/O
Module only
Serial I/O
Module only
Serial I/O
Module only
None
None
None
None
4
5
8
9
20W
20W
20W
20W
(Note1)
(Note1)
(Note1)
(Note1)
Description
Note1: Isolated RS-485 port; 115.2K bps; Data+, Data-
CPU Slot
Power
Supply
COM
Port
I/O Module
Supported
I/O Expansion Unit Selection Guide
3-20
2. I/O Expansion Unit:
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.
Block Diagram of 87K Expansion unit
SERIES
i-87K
I/O Expansion Unit
PAC
COM3
RS-485
RS-485
I-84xx/I-88xx
or I-7188 serial
87K4/87K5
87K4/87K5
87K8/87K9
87K8/87K9
For I-870xx
serial I/O
module only
RS-232
PC
I-7520