Communication
3.2 Communication services
CPU 31xC and CPU 31x, Technical Data
Manual, 01/2006 Edition, A5E00105475-06
3-7
Communication service Functionality Time at which the S7
connection is established ...
via MPI via DP via
PtP
via
PN
PROFINET IO Data exchange between IO
controllers and the IO
devices
does not require an S7
connection
– – – X
SNMP
(Simple Network
Management Protocol)
Standard protocol for
network diagnostics and
configuration
does not require an S7
connection
– – – X
open communication by
means of TCP/IP
Data exchange via
Industrial Ethernet with
TCP/IP protocol (by means
of loadable FBs)
Does not require an S7
connection, is handled in the
user program by means of
loadable FBs
– – – X
Open communication by
means of ISO on TCP
Data exchange via
Industrial Ethernet with
ISO-on-TCP protocol (by
means of loadable FBs)
Does not require an S7
connection, is handled in the
user program by means of
loadable FBs
– – – X
Open communication by
means of UDP
Data exchange via
Industrial Ethernet with
UDP protocol (by means of
loadable FBs)
Does not require an S7
connection, is handled in the
user program by means of
loadable FBs
– – – X
See also
Distribution and availability of S7 connection resources (Page 3-30)
Connection resources for routing (Page 3-32)
3.2.2 PG 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.
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