Connections Without Assignment - Siemens SIMATIC NET S7-300 Manual

5 Configuring Communication Connections
5.3.4

Connections Without Assignment

Overview
This section explains the actions that can lead to a configured connection losing its
assignment to the CP or being deleted.
Caution
Remember that in contrast to the S7 connections, the connections of the
SEND/RECEIVE interface are assigned a CP-dependent ID. The actions below
may require the ID to be modified so that the interface information in the user
program must also be adapted.
Notice
If you replace one CP with another, this must provide at least the same services
and have at least the same version. This is the only way to ensure that the
connections configured over the CP remain consistent and can be used.
Table 5-3 Actions That Can Cause Changes to Configured Connections
Action
The CP (module) is
moved to a different
location in the hardware
configuration (drag and
drop)
The CP (module) is
deleted in the hardware
configuration.
You receive the message
"CP has n connections;
the assignment will be lost
in the connection table".
A -112
Consequences for the
Connections
The connections are retained.
The connection IDs are
automatically updated.
The connections remain without
assignment to a CP in the
connection table. In the
"Overview" tab of the Properties
dialog, the connections are
identified with "!".
S7-CPs for Industrial Ethernet Configuring and Commissioning
How to Establish the Connection
Again
Once you have placed a CP in the
hardware configuration and networked it:
1. Assign the CP in the connection
properties dialog in the "Addresses"
tab.
or
Reassign the connection using the
menu option Edit Connection
"
Partner....
2. Check the module start address and
if necessary adapt it in the user
program
3. Adapt the connection ID in the user
program.
4. Download the connection
configuration to the CP again.
C79000-G8976-C182-07
Release 01/2007