8-2Communicating with Extended-Local I/O

Cabling

The maximum cable length for an extended-local I/O system is

30.5cable-m (100 cable-ft). Connect extended-local I/O adapters by using any of these cables:

Cable Length

Catalog Number

 

 

 

 

1 m (3.3 ft)

1771-CX1

 

 

 

 

2 m (6.6 ft)

1771-CX2

 

 

 

 

5 m (16.5 ft)

1771-CX5

 

 

 

 

 

 

 

 

You cannot connect or splice extended-local I/O cables to

IMPORTANT

form a custom cable length. For example, if you have a

 

 

 

distance of 4 m between two extended-local I/O adapters

 

or between a controller and an extended-local I/O adapter,

 

you cannot connect two 2 m cables together. You would

 

have to use the 5 m cable and have the extra 1 m as slack.

Terminate the link by installing the local I/O terminator (1771-CXT) on the last adapter module. The system will not run without it. The terminator is included with the controller.

Addressing and Placing I/O When a PLC-5/40L or -5/60L controller is used to scan both extended-local I/O and remote I/O racks, the total of both remote I/O and extended-local

I/O racks must not exceed the maximum number of racks allowed for the controller (16 racks for a PLC-5/40L or 24 racks for a PLC-5/60L). shows a PLC-5/40L controller controlling both extended-local I/O and remote I/O racks.

Publication 1785-UM012D-EN-P - July 2005

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Bradley Smoker PLC-5 user manual Cabling, Form a custom cable length. For example, if you have a