
TIWAY 1 Overview
1-1
TIWAY 1 TI505 NIM User Manual
Chapter 1
TIWAY
1 Overview
1.1 TIWAY
I FEA
TURES
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
TIW
A
Y I network provides
a reliable and flexible communication architecture. T
wo
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 (TIW
A
Y I Host Adapter
, TIW
A
Y 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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