Bradley Smoker PLC-5 user manual When assigning remote I/O rack numbers, use these guidelines

Addressing I/O and Controller Memory 4-9

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When assigning remote I/O rack numbers, use these guidelines:

•A single remote I/O scanner channel can support up to 32 devices but only 16 rack numbers. For more information, see chapter 6.

•Limit the number of remote I/O rack numbers to those that your PLC-5 controller can support.

•The PLC-5 controller and the 1771-ASB adapter module automatically allocate the next higher rack number(s) to the remaining I/O groups of the chassis. For example, if you select 1/2-slot addressing for your controller-resident local chassis and you are using a 16-slot (1771-A4B) chassis, the controller will address racks 0, 1, 2, and 3 in this chassis.

•You can assign a remote I/O rack to a fraction of a chassis, a single I/O chassis, or multiple I/O chassis as shown below.

	I/O Rack No. 0				I/O Rack No. 1
01		23	45	67	01	23	45	67

One 16-slot chassis, two racks

I/O Rack No. 3

0 1 2 3 4 5 6 7

One 16-slot chassis, one rack

0 1 2 3 4 5 6 7

One 8-slot chassis, 1/2 rack Two 4-slot chassis, 1/4 rack each

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Publication 1785-UM012D-EN-P - July 2005