Siemens S7-300 appendix PG communication, OP communication

Communication 3.2 Communication services

See also

Distribution and availability of S7 connection resources (Page 3-29)

Connection resources for routing (Page 3-31)

3.2.2PG communication

Properties

PG communication is used to exchange data between engineering stations (PG, PC, for example) and SIMATIC modules which are capable of communication. This service is available for MPI, PROFIBUS and Industrial Ethernet subnets. Transition between subnets is also supported.

PG communication provides the functions needed to download / upload programs and configuration data, to run tests and to evaluate diagnostic information. These functions are integrated in the operating system of

SIMATIC S7 modules.

A CPU can maintain several simultaneous online connections to one or multiple PGs.

3.2.3OP communication

Properties

OP communication is used to exchange data between operator stations (OP, TP, for example) and SIMATIC modules which are capable of communication. This service is available for MPI, PROFIBUS and Industrial Ethernet subnets.

OP communication provides functions you require for monitoring and modifying. These functions are integrated in the operating system of SIMATIC S7 modules. A CPU can maintain several simultaneous connections to one or several OPs.

3.2.4Data exchanged by means of S7 basic communication

Properties

S7-based communication is used to exchange data between S7 CPUs and the communication-capable SIMATIC modules within an S7 station (acknowledged data exchange). Data are exchanged across non-configured S7 connections. The service is available via MPI subnet, or within the station to function modules (FM).

S7-based communication provides the functions you require for data exchange. These functions are integrated into the CPU operating system. The user can utilize this service by means of "System function" (SFC) user interface.

CPU 31xC and CPU 31x, Technical data	3-7
Manual, Edition 08/2004, A5E00105475-05