Communication
3.2 Communication services
CPU 31xC and CPU 31x, Technical Data
3-8 Manual, 01/2006 Edition, A5E00105475-06
3.2.3 OP 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.
3.2.4 Data 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.
Reference
Further information
• on SFCs, refer to
Instruction list.
For further information refer to
STEP 7 Online Help
or
System and Standard Functions
reference manual.
• on communication can be found in the
Communication with SIMATIC
manual.
3.2.5 S7 communication
Properties
A CPU can always operate in server or client mode in S7 communication: We distinguish
between
• communication with unilateral configuration (for PUT/GET only)
• communication with bilateral configuration (for USEND, URCV, BSEND, BRCV, PUT,
GET)
However, the functionality depends on the CPU. A CP is therefore required in certain
situations.
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