Introduction

What Is a Network Interface Module?

Purpose

Every island requires a network interface module (NIM) in the leftmost location of the

 

primary segment. Physically, the NIM is the first (leftmost) module on the island bus.

 

Functionally, it is the gateway to the island bus—all communications to and from the

 

island bus pass through the NIM. The NIM also has an integrated power supply that

 

provides logic power to the island modules.

 

 

The Fieldbus

An island bus is a node of distributed I/O on an open fieldbus network, and the NIM

Network

is the island’s interface to that network. The NIM supports data transfers over the

 

fieldbus network between the island and the fieldbus master.

 

The physical design of the NIM makes it compatible with both an Advantys STB

 

island and your specific fieldbus master. Whereas the fieldbus connector on each

 

NIM type may differ, the location on the module front panel is essentially the same.

 

Other NIM connectors, such as the power supply interface and the CFG interface

 

(See The CFG Interface, p. 33), are identical for all NIM types.

Communications Roles

Communications capabilities provided on a standard NM include:

Function

Role

 

 

data exchange

The NIM manages the exchange of input and output data

 

between the island and the fieldbus master. Input data, stored in

 

native island bus format, is converted to a fieldbus-specific

 

format that can be read by the fieldbus master. Output data

 

written to the NIM by the master is sent across the island bus to

 

update the output modules and is automatically reformatted.

 

 

configuration services

Custom services can be performed by the Advantys

 

configuration software. These services include changing the

 

operating parameters of the I/O modules, fine-tuning island bus

 

performance, and configuring reflex actions. The Advantys

 

configuration software runs on a computer attached to the NIM’s

 

CFG port.

 

 

human-machine interface

An HMI panel can be configured as an input and/or output

(HMI) operations

device on the island bus. As an input device, it can write data

 

that can be received by the fieldbus master; as an output device,

 

it can receive updated data from the fieldbus master. The HMI

 

can also monitor island status, data, and diagnostic information.

 

The HMI panel must be attached to the NIM’s CFG port.

 

 

 

 

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890USE17700 April 2004

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Schneider Electric 890USE17700 manual What Is a Network Interface Module?, Purpose, Fieldbus, Communications Roles

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