Communication Utilities Of The Im 151-7 Cpu - Siemens SIMATIC ET 200S Manual

Functions of the IM 151-7 CPU
8.8 Communication

Communication utilities of the IM 151-7 CPU

The selected communication utility influences
S the functionality available to the user
S whether or not an S7 connection is required
S 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
PD communication
OP communication
S7 basic communication
S7 communication
Global data
communication
Routing of PD functions
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.
8-34
Functionality
Commissioning, testing,
diagnostics
Operating and monitoring
Data exchange
Data exchange
Cyclic data exchange
(e.g. memory markers)
For example, testing and
diagnosis across network
boundaries
S7 connection
Set up by the PD as soon as the
utility is used
Set up by the OP when switched
on
Programmed by means of blocks
(parameters at SFC)
IM 151-7 CPU only as server;
connection set up by the
communication partner
Does not require an S7
connection
Set up by the PD as soon as the
utility is used
ET 200S IM 151-7 CPU Interface Module
Via Via
MPI DP
x x
x x
x –
x x
x –
x x
A5E00058783-04