Advanced Configuration Features

Configuring Mandatory Modules

Summary

As part of a custom configuration, you can assign mandatory status to any I/O

 

module or preferred device on an island. The mandatory designation indicates that

 

you consider the module or device critical to your application. If the NIM does not

 

detect a healthy mandatory module at its assigned address during normal

 

operations, the NIM stops the entire island.

 

 

 

Note: The Advantys configuration software is required if you want to designate an

 

I/O module or a preferred device as a mandatory module.

 

 

 

 

Specifying

By default, the Advantys STB I/O modules are in a non-mandatory (standard) state.

Mandatory

Mandatory status is enabled by clicking on the mandatory checkbox on a module or

Modules

preferred device’s parameters property sheet. Depending on your application, any

 

number of modules that your island will support can be designated as mandatory

 

modules.

Effects on Island The following table describes the conditions under which mandatory modules affect Bus Operations island bus operations and the NIM’s response:

Condition

Response

 

 

A mandatory module fails during

The NIM stops the island bus. The island enters fallback

normal island bus operations.

mode (See Island Fallback Scenarios, p. 161). I/O

 

modules and preferred devices assume their fallback

 

values.

 

 

You attempt to hot swap a

The NIM stops the island bus. The island enters fallback

mandatory module.

mode. I/O modules and preferred devices assume their

 

fallback values.

 

 

You are hot swapping a standard

When power is restored, the NIM attempts to address the

I/O module that resides to the left

island modules but must stop at the empty slot where the

of a mandatory module on the

standard module used to reside. Because the NIM is now

island bus, and the island loses

unable to address the mandatory module, it generates a

power.

mandatory mismatch error and the island fails to restart.

 

 

 

 

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Schneider Electric 890USE17700 manual Configuring Mandatory Modules, Specifying
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890USE17700 specifications

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