Bradley Smoker PLC-5 user manual Or 1/2-Slot, Slot Logical rack Logical racks 11/2 logical rack

Models: PLC-5

1 388
Download 388 pages 13.97 Kb
Page 128
Image 128

8-10Communicating with Extended-Local I/O

How Chassis Size and Backplane Addressing Determine the Quantity of I/O Racks

If You are Using this

And 2-Slot

Or 1-Slot Addressing

Or 1/2-Slot

Chassis Size

Addressing

(Double Density)

Addressing

 

(Single Density)

 

(Quad Density)

 

 

 

 

4-slot

1/4 logical rack

1/2 logical rack

1 logical rack

 

 

 

 

8-slot

1/2 logical rack

1 logical rack

2 logical racks

 

 

 

 

12-slot

3/4 logical rack

11/2 logical rack

3 logical racks

 

 

 

 

16-slot

1 logical rack

2 logical racks

4 logical racks

 

 

 

 

On the extended-local-I/O scan list, the actual chassis size and backplane addressing is displayed, not the rack size.

The scan list for extended local I/O has one entry for each physical chassis on the extended local I/O channel.

If an adapter on a remote I/O channel resides in a physical chassis that contains more than one I/O rack, more than one entry appears on the remote I/O scan list for that single chassis.

The following table shows the scan list for both remote I/O and extended local I/O. Each channel shows a 16-slot chassis using 1-slot addressing with a starting address of rack 4, module group 0. This chassis contains logical racks 4-5.

Remote I/O Scan List vs Extended-local I/O Scan List

Remote

Extended

Rack ##

Starting

Rack

Range

 

Group

Size

 

4

0

FULL

040-047

5

0

FULL

050-057

Rack

Starting

Chassis

Backplane

Range

Address

Group

Size

Addressing

 

4

0

16-SLOT

1-SLOT

040-057

A scan list includes the following:

Publication 1785-UM012D-EN-P - July 2005

Page 128
Image 128
Bradley Smoker PLC-5 user manual Or 1/2-Slot, Slot Logical rack Logical racks 11/2 logical rack