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Manual VIPA CPU 21x Chapter 4 Deployment of the CPU 21x-2BT10 with TCP/IP
HB103E - Rev. 05/45 4-17
For the communication the following connection types are available:
•
TCP res . ISO-on-TCP for the secured data transfer of related data
blocks between two Ethernet participants.
•
UDP for the unsecured data transfer of related data blocks between two
Ethernet.
Using configurable connections there is always one station that actively
establishes a connection. The counter station waits passively for the active
connection. Only then productive data can be transferred.
By setting IP address and port/TSAP of the counter station, a connection is
specified . Active connections must always be set specified. An unspecified
connection which is only possible for passive connection establishment, IP
address and port/TSAP of the counter station are not required for telegram
evaluation.
There is also an option for part specified connections. The part
specifications happens via the setting of the port. An IP address is not
required.
Depending on the connection, the following operating modes are available:
SEND/RECEIVE
The SEND/RECEIVE interface allows the program controlled com-
munication to any partner station via a configured connection. Here the
data transfer happens by call from your user application. The FC5 and FC6
that are part of the VIPA block library are serving as interface.
This enables your control to send messages depending on process events.
FETCH/WRITE PASSIVE
With the help of FETCH/WRITE services partner systems have the direct
access to memory areas. This are "passive" communication connections
that have to be configured. The connections are "actively" established by
the connection partner (e.g. Siemens-S5).
FETCH PASSIVE (request data)
FETCH allows a partner system to request data.
WRITE PASSIVE (write data)
This allows a partner system to write data in the data area of the CPU.
Connection types
Connection
establishment
Connection
Operating modes