via RS-232 at MPI bus

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HMIs, human machine interfaces ► Panel PC ET/MT-4x6... ► Electrical Installation ► Connection of ► Control systems / Server ► via RS-232 an MPI-Bus

 

With an operator terminal with RS 232 interface, a connection to an MPI bus is established via the HMI-RS232 MPI box. Its main purpose is to adapt the RS 232 interface to the RS 485 bus system of the MPI interface. In the transport layer (layer 4), the MPI box uses the RK512 protocol. For further information, for example on the parameterisation of the MPI box, please refer to the MPI box manual.

 

Connection of Eagle devices to the CPU 3xx and CPU 4xx PLCs by Siemens.

 

Click to expand or collaps object.Figure, Connecting to MPI-Box HMI-RS232:

RS232_MPI_en

 

Click to expand or collaps information.  Pinning, Cable to MPI-Box HMI-RS232:

 

VB-99_CableToPC

 

 

Click to expand or collaps information.   Table, Connecting of the MPI-interface:

PIN

Signal name

Definition

1

N.C.

Not connected

2

0V (M24V)

Data reference potential 0V (of +24V)

3

RxD / TxD-P

Data line B

4

RTS / AS

Request to Send

5

0V (M5V)

Data reference potential 0V (of +5V)

6

+5V

Voltage +5 V

7

+24V

Voltage +24 V

8

RxD / TxD-N

Data line A

9

RTS PG

Request to Send PG

 

Hinweis

The RS-232 standard allows for a maximum cable capacity of 2500 pf.

The resulting maximum length of a standard cable is 15m.

Depending on transfer type and ambient conditions, this may be less.

 

 

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