Siemens SIMATIC TIWAY 1 Manual de usuario Pagina 13

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TIWAY I Overview
1-2
SIMATIC TIWAY I Series 500 NIM User Manual
1.1 TIWAY I System Overview
TIWAY I is an industrial Local Area Network designed to satisfy todays
factory and plant requirements for data acquisition and control of
manufacturing processes. It is a significant enhancement of the Siemens
Local Line, which has supported the PM550 Programmable Controllers
and DS 990 computer products since 1980.
The TIWAY I network provides a reliable and flexible communication
architecture. Two communication media options are available:
RS-232-C/423 provides modem interface for large geographic
coverage.
Local Line provides high noise immunity for networks up to 25,000
feet (7620 meters).
Redundancy is supported for either choice of media. TIWAY I uses
High-level Data Link Control (HDLC) protocol with CRC-16 error-checking
and message-length error-checking, providing reliable network
communication.
Throughout this manual, the following networking terms are used.
Primary the HDLC network manager
Secondary the device operating as an HDLC secondary slave (NIMs,
UNILINK Secondary Adapters)
Attached device controller, robot, etc. (Siemens controller connected
to the NIM, robot connected to a UNILINK Secondary Adapter)
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