Siemens SIMATIC TI500 Manual de usuario descargar pdf (Pagina 23)

Network Installation

2-7

TIWAY I Gateway User Manual

The

terminating resistors must be used to ensure that the main line cable is

properly terminated and biased for improved reliability

. Each tap housing is

supplied with terminating resistors to connect to the ends of the main line

cable. At each end, a terminating resistor must be connected between LLM+

and the cable shield and also between LLM– and the cable shield inside the

tap housing.

I000000

GWB

Termination

Resistors:

ohms

1/4 watt

Cable

to Module

Network Cable

Input Output

Figure 2-4 Terminating

the Local Line

Siemens Industrial Automation recommends Belden 9860 twisted-pair

cabling or its equivalent for use as the Local Line network spine. Belden

9271 or its equivalent should be used for the dropline. Brands other than

those listed here will be specified by Siemens upon request.

Some major points to consider during the planning phase of a Local Line

network are the following.

•

From the start, allow for system growth. Make provisions for the

attachment of additional computing devices by routing cables through

all probable areas of future plant expansion.

•

Always make the network flexible enough to allow for re-arrangement

of plant equipment.

•

Since network system noise is usually picked up by its interconnecting

wiring, take steps during installation to bypass or eliminate noise

sources.

•

If cable redundancy is required, make sure the two cables are never

routed along the same path, since the environmental and other factors

which disable one cable will very likely disable the second cable.

Ter

minating the

Main Line Cable

Twisted-Pair

Cabling

Important Planning

Considerations

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 93 94

Comentarios a estos manuales

Sin comentarios

Siemens SIMATIC TI500 Manual de usuario Pagina 23

Comentarios a estos manuales

Relacionado con productos y manuales para Gateways / Controladores Siemens SIMATIC TI500