Siemens ET 7Y Series Especificaciones descargar pdf (Pagina 146)

Functions of the IM 151-7 CPU

8-34

ET 200S IM 151-7 CPU Interface Module

A5E00058783-04

8.8 Communication

Communication utilities of the IM 151-7 CPU

The selected communication utility influences

 the functionality available to the user

 whether or not an S7 connection is required

 the time at which the connection is set up

The user interface can be very different (SFC, SFB, ...) and also depends on the

used hardware (SIMATIC-CPU, PC, ...).

The IM 151-7 CPU provides the following communication utilities:

Table 8-14 Communication utilities of the IM 151-7 CPU

Communication utility

Functionality S7 connection Via

MPI

Via

PD communication Commissioning, testing,

diagnostics

Set up by the PD as soon as the

utility is used

x x

OP communication Operating and monitoring Set up by the OP when switched

x x

S7 basic communication Data exchange Programmed by means of blocks

(parameters at SFC)

x –

S7 communication Data exchange IM 151-7 CPU only as server;

connection set up by the

communication partner

x x

Global data

communication

Cyclic data exchange

(e.g. memory markers)

Does not require an S7

connection

x –

Routing of PD functions For example, testing and

diagnosis across network

boundaries

Set up by the PD as soon as the

utility is used

x x

Chapters 4 and 1 contain information on network configuration and addressing.

PD communication

PD communication enables data exchange between engineering stations (e.g. PD,

PC) and communications-capable SIMATIC modules. The utility is possible on MPI

and PROFIBUS subnetworks. The transition between subnetworks is also

supported.

PD communication provides functions which are required for downloading

programs and configuration data, for executing tests and evaluating diagnostic

information. These functions are integrated in the operating system of the

SIMATIC S7 modules.

A CPU can maintain several online connections to one or more PDs

simultaneously.

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