S7-400 Assembly In Multiple Racks; Configuration Variants Of The S7-400; Characteristics Of Local And Remote Interfacing - Siemens SIMATIC S7-400 Configuration And Use Manual

Configuration Variants of the S7-400

6.6

S7-400 Assembly in Multiple Racks

Introduction
If you need more than 16 modules (signal, function and communication modules)
in your automation task, you can install the S7-400 in multiple racks and
interconnect them using interface modules (IM).
Remote interfacing and local interfacing are used to assemble an S7-400,
depending on the interface modules used to connect the expansion devices with
the central controller.
Local Interfacing
Local interfacing is suitable for small plants in which the I/O is located in the vicinity
of the central controller. This can be built with or without current transfer, based on
the functionality and current demands of the modules in the connected expansion
device.
Remote Interfacing
The effort required for cabling the I/O and the susceptibility of the connections
increases in large, extensive plants. Such scenarios demand remote interfacing,
where the distance between the central controller and the most remotely located
expansion device can reach up to 605 m.
Table 6-1
Send IM
Receive IM
Maximum number of connectable
EDs per line
Maximum distance
5 V transfer
Maximum current transfer per in-
terface
Use of modules that use the C
bus (e.g. FMs, CPs)
6-10

Characteristics of Local and Remote Interfacing

Local interfacing
460-0 460-1
461-0 461-1
4 1
5 m 1.5 m
No Yes
- 5 A
Yes No
Automation System S7-400 Configuration and Use
Remote interfacing
460-3 460-4
461-3 461-4
4 4
102.25 m 605 m
No No
- -
Yes No
A5E00442711-02