315-4PN33

The structure of a MPI net is electrically identical with the structure of

a PROFIBUS net. This means the same rules are valid and you use

the same components for the build-up. The single participants are

connected with each other via bus interface plugs and PROFIBUS

cables. Please consider with the CP 315-4PN33 that the total exten-

sion of the MPI net does not exceed 50m. Per default the MPI net

runs with 187.5kbaud. VIPA CPUs are delivered with MPI address 2.

The MPI programming cables are available at VIPA in different var-

iants. The cables provide a RS232 res. USB plug for the PC and a

bus enabled RS485 plug for the CPU. Due to the RS485 connection

you may plug the MPI programming cables directly to an already

plugged plug on the RS485 jack. Every bus participant identifies itself

at the bus with an unique address, in the course of the address 0 is

reserved for programming devices.

A cable has to be terminated with its surge impedance. For this you

switch on the terminating resistor at the first and the last participant of

a network or a segment. Please make sure that the participants with

the activated terminating resistors are always power supplied. Other-

wise it may cause interferences on the bus.

1. Connect your PC to the MPI jack of your CPU via a MPI pro-

gramming cable.

2. Load your project in the SIMATIC Manager from Siemens.

Choose in the menu ‘Options è Set PG/PC interface’.

4. Select in the according list the "PC Adapter (MPI)"; if appropriate

you have to add it first, then click on [Properties].

5. Set in the register MPI the transfer parameters of your MPI net

and type a valid address.

6. Switch to the register Local connection.

7. Set the COM port of the PCs and the transfer rate 38400Baud

for the MPI programming cable from VIPA.

Via ‘PLC è Load to module

’ via MPI to the CPU and save it on

a MMC via ‘PLC è Copy RAM to ROM’ if one is plugged.

5.9.2 Transfer via Ethernet

For transfer via Ethernet the CPU has the following interface:

n X5: Ethernet PG/OP channel

Net structure

MPI programming cable

Terminating resistor

Approach transfer via

MPI interface

VIPA System 300SDeployment CPU 315-4PN33

Project transfer > Transfer via Ethernet

HB140 | CPU | 315-4PN33 | GB | 14-43 50