Siemens Simatic S7-300, Руководство по аппаратному обеспечению и установке, Страница: 64 / 242

Configuring
S7-300 Programmable Controller Hardware and Installation
4-36
A5E00105492-01
RS485 bus connector
Table 4-18 Bus connectors
Type Order No.
RS485 bus connector, up to 12 Mbps,
with 90° cable exit,
without PG interface,
with PG interface
6ES7 972-0BA11-0XA0
6ES7 972-0BB11-0XA0
Fast Connect RS485 bus connector, up to 12 Mbps,
with 90° cable exit, with insulation displacement technology
, without PG interface,
with PG interface
6ES7 972-0BA50-0XA0
6ES7 972-0BB50-0XA0
RS485 bus connector, up to 12 Mbps,
with 35° cable exit (not for CPU 31xC),
without PG interface,
with PG interface
6ES7 972-0BA40-0XA0
6ES7 972-0BB40-0XA0
Application
You require these bus connectors to connect the PROFIBUS cable the an MPI or
PROFIBUS-DP interface
You do not require a bus connector for:
•
DP slaves with degree of protection IP 65 (e.g. ET 200C)
•
RS485 Repeater.
RS485 Repeater
Table 4-19 RS485 Repeater
Type Order No.
RS485 Repeater 6ES7 972-0AA00-0XA0
Purpose
An RS485 repeater amplifies data signals on bus lines and interconnects bus
segments.
You require this RS485 Repeater in the following situations:
•
for operation with more than 32 network nodes
•
when interconnecting a grounded and an ungrounded segment
•
when exceeding the maximum line length in a segmentThe maximum cable
lengths for RS485 Repeaters ...
... is found in the Chapter Cable lengths.