Siemens SIMATIC TIWAY 1 Manual de usuario descargar pdf (Pagina 20)

Network Design Considerations

2-3

TIWAY 1 Ti505 NIM User Manual

The

selection of the network communication media

depends primarily on the geographic

distance

to be spanned. The main TIW

Y I trunk can be up to 10,000

feet long (25,000

feet

depending on system loading

and baud rate selection), and can have up to 254 drop

lines. Each dropline can be up to 100 feet long. For distances exceeding 25,000 feet,

RS-232-C/423

media interfaces and modems should be used.

NOTE

The proper installation of your communication media requires careful

planning and design. If you need assistance, a site survey is available

from

Siemens Industrial Automation,

Inc. Simply fill out and return the

enclosed

“TIW

Y I Network Evaluation Form”, (Appendix C).

2.1.2

Media Redundancy

Media

redundancy is supported for RS-232-C and

Local Line NIMs. This means you can

have

backup communication media, in case of unforeseen cable problems or accidents. In

order

to achieve true redundancy

, you must have

completely

redundant network media

(network

trunk lines, tap housings, drop lines, and modems). For example, if you need

Local

Line cable redundancy

, you will need one

PPX:505–7339 TI505 NIM, two separate

twisted

pair trunk (spine) cables, and a T

-T

ap and dropline for each port on the NIM.

The

primary reason for using media redundancy is to permit communications on an al

ternate

channel when the main channel fails. The redundant media

connection does not

allow

two independent networks to communicate with the same NIM.

The

NIM will respond over the same channel that received the network command. For

example,

if the Host sends the command to Port A, the NIM will respond through Port A.

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