Supplementary information
18.7 Communication services
CPU 410 Process Automation/CPU 410 SMART
320 System Manual, 05/2017, A5E31622160-AC
Job lengths and parameters for the different types of connection
Table 18- 7 Job lengths and "local_device_id" parameter
ISO on TCP 32 KB 1452 bytes
"local_device_id" parameter for the connection description
Dev. ID 16#5 for CPU 0, interface x5
16#15 for CPU1, interface x5
16#8 for CPU 0, interface x8
16#18 for CPU1, interface x8
16#0 for CPU 0
16#10 for CPU1
Establishing a communication connection
● Use with TCP and ISO on TCP
Both communication partners call FB 65 "TCON" to establish the connection. In the
configuration, you specify which communication partner activates the connection, and
which one responds to the request with a passive connection. To determine the number
of possible connections, refer to your CPU's technical specifications.
The CPU automatically monitors and holds the active connection.
If the connection is broken, for example by line interruption or by the remote
communication partner, the active partner tries to reestablish the connection.
If a subsystem of a fault-tolerance system is switched to STOP, the system retains the
connections through the CPU switched to STOP and establishes them again after link-up.
You do not have to call FB 65 "TCON" again.
When FB 66 "TDISCON" is called or the CPU is in STOP operating state, an existing
connection will be terminated. To reestablish the connection you must call FB65 "TCON"
again.
● Use with UDP
Both communication partners call FB 65 "TCON" to set up their local communication
access point. This establishes a connection between the user program and operating
system's communication layer. No connection is established to the remote partner.
The local access point is used to send and receive UDP message frames.
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