Structure of a CPU 41x
2.1 Control and display elements of the CPUs
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
2-3
MPI/DP Interface
You can connect various devices to the MPI interface of the CPU, for example:
● Programming devices
● Operator control and monitoring devices
● Other S7-400 or S7-300 controllers
Use the bus connection connector with oblique cable outlet, see the manual
S7-400
Automation System, Hardware and Installation
.
You can also configure the MPI interface as a DP master so that you can use it as
PROFIBUS DP interface with up to 32 DP slaves.
PROFIBUS DP Interface
You can connect the distributed I/O, programming devices/OPs and other DP master
stations to the PROFIBUS DP interface.
PROFINET Interface
You can connect PROFINET IO devices to the PROFINET interface. The PROFINET
interface has 2 RJ 45 sockets and is equipped with a 2-port switch. The PROFINET interface
provides the connection to the Industrial Ethernet, CBA, etc..
Caution
You can only connect to a LAN with this interface. You cannot connect to the public
telecommunication network.
Power Supply, External Backup Voltage at the "EXT.-BATT." Jack
You can install either one or two backup batteries in the S7-400 power supply modules,
depending on the module type to achieve the following:
● You back up the user program stored in RAM.
● You retain the values of flags, timers, counters, system data and the data in dynamic
DBs.
● You back up the internal clock.
You can achieve the same backup by supplying a voltage between 5 V DC and 15 V DC to
the "EXT.-BATT." jack of the CPU.
The "EXT.-BATT." input has the following features:
● Polarity reversal protection
● Short-circuit current limited to 20 mA
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