ICP DAS USA i-8000 Series manual O Expansion Unit, Expansion Unit Selection Guide

i-87KSERIESI/O Expansion Unit

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

PAC

COM3

RS-485

I-84xx/I-88xx	RS-232
or I-7188 serial

PC

I-7520

87K4/87K5

	-485
87K8/87K9	RS	87K4/87K5

For I-870xx
serial I/O
module only	87K8/87K9

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

Note1: Isolated RS-485 port; 115.2K bps; Data+, Data-

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