Product overview, functions
2.5 Configuration limits and performance data
CP 1543-1
Operating Instructions, 05/2017, C79000-G8976-C289-07
17
The following characteristics are important (OUC + FETCH/WRITE):
Number of connections
• Number of configured and programmed +connections in total (ISO
transport + ISO-on-TCP + TCP + UDP + FETCH/WRITE + e-mail):
Max. 118
Of which maximum:
– TCP connections: 1...118
1)
– ISO-on-TCP connections: 1...118
– ISO transport connections: 1...118
– Total number of UDP connections (specified and free) that can be
configured: 1...118
– Connection for e-mail: 1
– Connections for FETCH/WRITE: 1...16
Notes:
1)
Avoid receive overload
The flow control on TCP connections cannot control permanent overload
of the recipient. You should therefore make sure that the processing ca-
pabilities of a receiving CP are not permanently exceeded by the sender
(approximately 150200 messages per second).
Maximum data length for program blocks Program blocks allow the transfer of user data in the following lengths:
• ISO-on-TCP, TCP, ISO transport: 1 to 64 kB
• UDP: 1 to 1452 bytes
• E-mail
– Job header + user data: 1 to 256 bytes
– E-mail attachment: up to 64 kbytes
LAN interface max. data field length generat-
ed by CP per protocol data unit(TPDU =
transport protocol data unit)
• sending
ISO transport, ISOonTCP, TCP: 1452 bytes / TPDU
• receiving
– ISO transport: 512 bytes / TPDU
– ISO-on-TCP: 1452 bytes / TPDU
– TCP: 1452 bytes / TPDU
Note
Connection resources of the CPU
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 ac
tually be achieved may be lower than
specified in this section describing the CP.
You will find detailed information on the topic of connection resources in the
"Communication" function manual, refer to the section
Guide to the documentation (Page 9).
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