Configuring Hardware and Communication Connections STEP 7.pdf

Configuring Connections
Note
To execute programming device functions on CPs for the S7-400 through the MPI
or through the integrated DP interface, two connection resources are needed at the
CPU (for two transition points). This requirement must be taken into account in
determining the total number of configured STEP 7 connections.
SEND/RECEIVE Interface
Communication through the SEND/RECEIVE interface takes place only through
CPs. Each connection (i.e. FDL, ISO-transport, ISO-on-TCP, UDP and TCP
connections) takes up one resource at the CP for the end point.
At an S7-300 CPU and a C7-600 CPU, no connection resources are required for
the connection.
(1) Available connection resource
(2) Assigned connection resource
(3) Industrial Ethernet, PROFIBUS
At a S7-400 CPU, no connection resources are required for SEND/RECEIVE
connections (i.e. FDL, ISO-transport, ISO-on-TCP connections.
(1) Available connection resource
(2) Assigned connection resource
(3) Industrial Ethernet, PROFIBUS
Note
To execute programming device functions on CPs for the S7-400 through the MPI
or through the integrated DP interface, two connection resources are needed at the
CPU (for two transition points). This requirement must be taken into account in
determining the total number of configured STEP 7 connections.
Configuring Hardware and Communication Connections with STEP 7
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