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2.3
Local Line Cable Installation
Local Line
Characteristics
2-6
Network Design Considerations
The following paragraphs describe Local Line characteristics and
installation guidelines.
The TIWAY I Local Line is a physical signaling technique (baseband,
differential current drive) which operates over shielded, twisted-pair
cabling. The Local Line cable may be up to 25,000 feet long, depending on
loading and baud rate selection. It uses tap housings to simplify the
addition of connections to TIWAY I. The Local Line is designed to operate
with shielded, twisted-pair cable which has a characteristic impedance of
124 ohms.
The interface is a male, 9-pin D-type receptacle with pin assignments as
shown in Table 2-2.
Table 2-2 Pin Assignments of Local Line Connectors
Pin
Name
1
2
3
Shield
4
5
6
LLM+
7
8
9
LLM–
NOTE: If you need Local Line cable redundancy, you will need one
PPX:500–5039 NIM, two separate twisted pair cables, and a T-Tap and
dropline for each port on the NIM. All taps and connectors are supplied with
the Local Line, but extras may be necessary for cable splicing. Suggested
routing procedures for redundant Local Line cabling are listed later in this
section.
Description
No connection
No connection
Cable shield and signal common
No connection
No connection
Positive biased signal line
No connection
No connection
Negative based signal line
SIMATIC TIWAY I Series 500 NIM User Manual
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