Momentum Modbus Plus 170 PNT Series Guida Utente Scaricare il pdf (Pagina 128)

100

101

Using the Modbus Plus Ports

116

870 USE 101 00 V.2.2

Modbus Plus Features for Momentum

Introduction

When a Modbus Plus network is constructed entirely of Momentum components, it

may take advantage of two new features:

cluster mode, which allows small groups of devices to be linked by short

lengths of cable;

supporting up to 64 nodes on a

single

section of cable.

Cluster Mode

A cluster may consist of up to eight Momentum devices. A network may contain up

to eight clusters.

The cable between devices in a cluster may be 10 in to 3 ft. The cable between

clusters or between a cluster and the trunk must be at least 10 ft.

The maximum length of the network continues to be 1500 ft. The maximum

number of devices in a network continues to be 64.

Note:

Only Momentum devices are allowed in a cluster.

64 Nodes

When a Modbus Plus network consists entirely of Momentum devices, then a single

section of cable may support 64 nodes instead of the standard 32 nodes.

Example:

If a single SA85 is added to a network of Momentum modules, the

network is no longer Momentum only, but a mixture of devices. Each cable section

must be limited to 32 nodes. Cable sections must be connected by a repeater.

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Momentum Modbus Plus 170 PNT Series Guida Utente Pagina 128

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