Centralized And Distributed I/O; Centralized I/O; Expansion Racks In S7-300/S7-400 - Siemens SIMATIC S7-300 Manual For Migrating

4 Hardware Migration
4.3

Centralized and distributed I/O

4.3.1

Centralized I/O

The basic design of the centralized I/O of the SIMATIC S7-300/S7-400 differs only
insignificantly from the one of the S7-1500. Both systems share the same design
where the CPU and the centralized I/O are connected via an appropriate
backplane bus. Module connectors are used to connect the systems to the plant
I/O.
4.3.2

Expansion racks in S7-300/S7-400

In SIMATIC S7-300/S7-400 the centralized I/O can be expanded by other I/O
modules with the help of expansion units (module racks
are connected to the central unit (module rack 0) by means of the respective
interface modules IM 36x or IM 46x.
Table 4-2
Central unit interface
Table 4-3
Central unit
interface
IM 460-0 S
IM 460-1 S
IM 460-3 S
IM 460-4 S
For S7 1500, these particular interface modules are not necessary, since up to 32
modules can be plugged side by side in the central configuration.
In comparison, the following 2 maximum configurations are listed:
Table 4-4
Smallest maximum configuration
PS+CPU1511/1513+modules with
25mm
870mm
If the control cabinet does not provide the necessary width for a central
configuration, there is also the option of connecting a distributed station in the
control cabinet via PROFINET.
Migration S7-300/S7-400 nach S7-1500
Entry ID: 109478811, V1.1,
Expansion unit interface
IM 360 S
IM 365 S-R
Expansion unit
interface
IM 461-0
IM 461-1
IM 461-3
IM 461-4
05/2017
1-3). The expansion racks
Maximum number of
IM 361 R
IM 365 S-R
Maximum number
of expansion units
4
4
1
4
Largest maximum configuration
PS+CPU1517/1518+modules with 35mm
1370mm
expansion units
3
1
Power supply
Feed in EU
Feed in EU
Transferred during
connection
Feed in EU
19