Siemens Simatic S7-400 User Manual

S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
4-1
Communication
4
4.1 interfaces
4.1.1 Multi-Point Interface (MPI)
Availability
The MPI/DP interface of an S7-400 CPU in the factory state is set as an
MPI interface with an address of 2.
Properties
The MPI represents the CPU interface for PG/OP connections or for communication on an
MPI subnet.
The preset transmission rate for all CPUs is 187.5 Kbps. The maximum transmission rate is
12 Mbps.
The CPU automatically broadcasts its configured bus parameters via the MPI interface (the
baud rate, for example). A programming device, for example, can thus receive the correct
parameters and automatically connect to a MPI subnet.
Note
In runtime, you may only connect programming devices to an MPI subnet.
Other stations, such as OP or TP, should not be connected to the MPI subnet in runtime.
Otherwise, transferred data might be corrupted due to interference pulses or global data
packages may be lost.
Time synchronization
Time synchronization is possible by using the MPI interface of the CPU. The CPU can be
master or slave.

Siemens Simatic S7-400 Specifications

General

Programming Language	STEP 7 (LAD, FBD, STL, SCL, GRAPH)
Communication Interfaces	MPI, PROFIBUS
Power Supply	24 V DC, 120/230 V AC (Power supply modules are separate and chosen based on system requirements)
Operating Temperature	0°C to 60°C
Mounting	Rack mounting
Processor	CPU 412-1, CPU 414-2, CPU 416-2, CPU 417-4 (Different CPUs offer varying performance and features)
Relative Humidity	5 to 95% (non-condensing)