Siemens SIMATIC TI500 Manual de usuario descargar pdf (Pagina 20)

Network Installation

2-4

TIWAY I Gateway User Manual

2.2 Network Media Installation — Local Line

TIWAY

I is a multi-drop communications network. It consists of a main

trunk cable (the “spine”) and dropline cables. The network can connect up to

248 secondaries to a host computer

NOTE:

Although addresses can range from 1 to 254 on TIW

Y I, addresses

248 through 254 cannot be used because of the limitations of the Modbus

protocol.

The selection of the media interface depends primarily upon two criteria:

the distance to be spanned and the cost of installation. The main trunk can

be up to 25,000 feet long, and each dropline can be up to 100 feet long, with

Local Line. For distances exceeding 25,000 feet, the use of RS-232-C media

interfaces and modems is required.

If cable redundancy is required (two TIW

Y I cables), you will need two

Gateways, two cables, and two host system interface devices. Refer to the

appropriate host system user manuals for more specific information on

redundant connections.

The TIW

Y I Local Line is a physical signalling technique (baseband,

differential current drive) which operates over shielded, twisted-pair

cabling. The Local Line cable may be up to 25,000 feet long. The Local Line

uses tap housings to simplify the addition of connections onto TIW

Y I.

The Local Line is designed to operate with shielded twisted-pair cable which

has a characteristic impedance of 124 ohms. The interface is a male, 9-pin

D-type connector with pin assignments as shown in T

able 2-1.

able 2-1

Pin Assignments for Local Line Connector

Pin Name Description

Shield

LLM+

LLM–

Reserved

Cable shield and signal common

Reserved

Positive biased signal line

Reserved

Negative biased signal line

Overview

Local

Line Cable

Characteristics

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 93 94

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