Siemens SIMATIC ET 200AL, System Manual

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Connection resources
12.3 Display of the connection resources
Communication
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Function Manual, 05/2021, A5E03735815-AJ
The warning triangle in the column of the dynamic station resources is displayed because the
sum of the maximum available connection resources of CPU, CP and CM (= 310 connection
resources) exceeds the station limit of 256.
Note
Available connection resources exceeded
STEP 7 signals the exceeding of the station-specific connection resources with a warning. To
make full use of the connection resources from the CPU, CP and CM, either use a CPU with a
higher maximum number of available station-specific connection resources or reduce the
number of communications connections.
② Module-specific connection resources
The columns of the module-specific connection resources provide information about the use
of resources on the CPUs, CPs and CMs of an automation system:
The display is per module and not per interface.
In the example, the CPU makes a maximum of 128 connection resources available, of which
18 are already in use and 110 still available.
The used resources are divided up as follows:
•
6 resources for HMI communication
• 4 resources for S7 communication
• 8 resources for Open User Communication