Cpu Communication Options - Siemens SIMATIC S7-300 Series Reference Manual

CPUs
Table 1-6

CPU Communication Options

Communications
PG/OP Communication
S7 Basic Communication
Routing of PG Functions
S7 Communication
Global Data Communication
1-12
MPI DP
x x A CPU can maintain several on-line connections
simultaneously with one or more programming devices or
operator panels. For PD/OP communication via the DP
interface, you must activate the "Programming, modifying
and monitoring via the PROFIBUS" function when
configuring and assigning parameters to the CPU.
x x Using the I system functions, you can transfer data over the
MPI/DP network within an S7-300 (acknowledged data
exchange). Data exchange takes place via non-configured
S7 connections.
x - Using the XI system functions, you can transfer data to
other communication peers in the MPI subnet
(acknowledged data exchange). Data exchange takes
place via non-configured S7 connections.
A listing of I/X SFCs is found in the Instruction List. Details
are found in the STEP 7 Online Help or in the System and
Standard Functions reference manual.
x x With CPUs 31x-2 and STEP 7 as of V 5/0, you can route
your PG/PC to S7 stations of other subnets, e.g. for
downloading user programs or hardware configurations, or
executing, testing and commissioning functions. Routing
with the DP interface requires you to activate the
"Programming, Status/Control..." function when configuring
and assigning parameters to the CPU.
Details on routing are found in the STEP 7-Online Help.
x - S7 communication takes place via configured S7
connections. Here, the S7-300-CPUs are servers for
S7-400 CPUs. That is, S7-400 CPUs have read/write
access to S7-300 CPUs.
x - The CPUs of the S7-300/400 can exchange global data
with one another (unacknowledged data exchange).
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
Description
A5E00111190-01