Allen-Bradley Rockwell Automation 1734-AENT Manuel d'utilisateur télécharger pdf (Page 18)

Publication 1734-UM011D-EN-P - May 2011

2 About the Adapter

The default setting for the chassis size is 1 slot, which represents the adapter

by itself.

Set the chassis size as the sum of the slot of the adapter plus the slots of each

I/O module in the adapter backplane. For example, the adapter plus 4 I/O

modules uses a chassis size of 5. The adapter stores this chassis size setting in

non-volatile storage.

When the adapter’s non-volatile chassis size does not match the actual number

of modules present on its backplane, the adapter does not make any I/O

connections and an error occurs, as shown in the Module Properties dialog.

Adapter Replacement

It is important to note that during a connection request from the controller,

the chassis size setting for a 1734-AENT adapter is not communicated to the

adapter. You must always set this chassis size using a separate operation. This

includes situations when you are replacing an adapter. The adapter does not

make any I/O connections until it is configured with the appropriate chassis

size.

Empty Slots and RIUP Situations

The POINT I/O system does not have the ability to detect an empty terminal

base. Because of this, there are numerous situations in which you can

potentially configure a system that is unusable or one that exercises unintended

control.

In an attempt to address these situations, you must observe the following rules

for POINT I/O system construction and the removal and reinsertion of

modules:

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Allen-Bradley Rockwell Automation 1734-AENT Manuel d'utilisateur Page 18