Siemens Simatic S7-300 Specifications Page 38

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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x
3-22 A5E00105475-03
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PG communication is used to exchange data between engineering stations (e.g.
PG, PC) and SIMATIC modules that are capable of communication. This service is
possible via MPI / PROFIBUS / industrial Ethernet subnets. Transition between
subnets is also supported.
PG communication provides functions required for loading programs and
configuration data, as well as for testing and evaluating 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.
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OP communication is used to exchange data between operator stations (e.g. OP,
TP) and communication-capable SIMATIC modules. This service is possible via
MPI / PROFIBUS / industrial Ethernet subnets.
OP communication provides functions required for operating and monitoring.
These functions are integrated in the operating system of SIMATIC S7 modules.
A CPU can maintain several simultaneous connections to one or several OPs.
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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 exchange takes place via non-configured S7 connections.
The service can be used on an MPI subnet or for internal communication between
the station and function modules (FM).
S7 basic communication provides functions required for data exchange. These
functions are integrated into the CPU operating system.
The user can utilize this service via "System function" (SFC) user interface.
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The CPUs as the server in S7 communication. The connection is always
established by the communication partner. This service is possible via MPI /
PROFIBUS / industrial Ethernet subnets.
The operating system processes these services without explicit user interface.
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S7 communication as a client can be implemented using CPs and loadable FBs.
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