TIWAY 1 Overview
1-1
TIWAY 1 TI505 NIM User Manual
Chapter 1
TIWAY 1 Overview
1.1
TIWAY I FEATURES
TIWAY I is an industrial Local Area Network (LAN) designed to satisfy today’s factory
and plant requirements for data acquisition and control of manufacturing processes. It is
a significant enhancement of the Siemens “Local Line,” which supports the PM550
Programmable Controllers (P/Cs) and DS 990 computer products.
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).
Throughout this manual, the following networking terms are used.
HDLC — TIWAY I High-level Data Link Control data communications
procedures with CRC–16 error-checking and message-length error-checking
Primary — HDLC network manager (TIWAY I Host Adapter, TIWAY I Gateway,
or UNILINK Host Adapter with the Network Manager function)
Secondary — device operating as an HDLC secondary slave (NIMs, UNILINK
Secondary Adapters, UNILINK Host Adapter acting as a Secondary)
Attached device — P/C, robot, etc. (a P/C connected to the NIM, robot connected
to a UNILINK Secondary Adapter)
Host — computer or intelligent device establishing network communications.
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