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Properties and functions
1.5 Configuration limits and performance data
Note
Connection resources CPU dependent
Depending on the CPU type, different numbers of connection resources are available. The
number of connection resources is the decisive factor for the number of configurable
connections. This means that the values that can actually be achieved may be lower than
specified in this section "Properties and functions" describing the CM.
1.5.3
Characteristic data Open User Communication incl. e-mail
Open User Communication (OUC) provides access to communication over TCP, ISO-on-TCP
and UDP connections.
Characteristic
Number of connections
Number of multicast address ranges
16
Explanation / values
•
Max. number of connections in total (configured and programmed):
(ISO-on-TCP + TCP + UDP + e-mail) ≤ 64
of which:
–
TCP connections: 0 ... 64
ISO-on-TCP connections: 0 ... 64
–
Total number of UDP connections (specified and free) that can be
–
configured: 0 ... 64
Connection for e-mail: 0 to 1;
–
only one e-mail can be processed at any one time.
Notes:
•
Avoid overload at receiving end
1)
The flow control on TCP connections cannot control permanent
overload of the recipient. You should therefore make sure that the
processing capabilities of a receiving CM are not permanently
exceeded by the sender (approximately 150 200 messages per
second).
Max. 6
Operating Instructions, 04/2023, C79000-G8976-C355-05
1)
SIMATIC CM 1542-1
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