Siemens Automation System S7-400 User Manual Page 21

  • Download
  • Add to my manuals
  • Print
  • Page
    / 228
  • Table of contents
  • BOOKMARKS
  • Rated. / 5. Based on customer reviews
Page view 20
Installing the S7-400
2-5
Automation System S7-400 Hardware and Installation
A5E00850741-01
Rules for Connection
When you connect a central rack to expansion racks, you must observe the
following rules:
You can connect up to 21 ERs of the S7-400 to one CR.
The ERs are assigned numbers to identify them. The rack number must be set
on the coding switch of the receive IM. Any rack number between 1 and 21 may
be assigned. Numbers must not be duplicated.
You may insert up to six send IMs in one CR. However, only two send IMs with
5 V transfer are allowed in one CR.
Each chain connected to the interface of a send IM can comprise up to four ERs
(without 5 V transfer) or one ER (with 5 V transfer).
The exchange of data via the communication bus is limited to 7 racks, meaning
the CR and ER numbers 1 to 6.
The maximum (total) cable lengths specified for the type of connection must not
be exceeded.
Type of Connection Maximum (Total) Cable Length
Local connection with 5 V transfer via
IM 460-1 and IM 461-1
1.5 m
Local connection without 5 V transfer via
IM 460-0 and IM 461-0
5m
Remote connection via IM 460-3 and
IM 461-3
102.25 m
Remote connection via IM 460-4 and
IM 461-4
605 m
Page view 20
1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 227 228

Comments to this Manuals

No comments