Siemens SIMATIC S7-1200 Manual page 130

Easy to communicate between devices
7.5 PROFINET
The following example shows the communication between two CPUs that utilize 1
connection for both sending and receiving the data.
● Each CPU uses a TCON instruction to configure the connection between the two CPUs.
● The TSEND instruction in CPU_1 links to the TRCV instruction in CPU_2 by using the
● The TSEND instruction in CPU_2 links to the TRCV instruction in CPU_1 by using the
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connection ID ("connection ID 1") that was configured by the TCON instruction in CPU_1.
The TRCV instruction in CPU_2 links to the TSEND instruction in CPU_1 by using the
connection ID ("connection ID 1") that was configured by the TCON instruction in CPU_2.
connection ID ("connection ID 1") that was configured by the TCON instruction in CPU_2.
The TRCV instruction in CPU_1 links to the TSEND instruction in CPU_2 by using the
connection ID ("connection ID 1") that was configured by the TCON instruction in CPU_1.
① TCON on CPU_1 creates a
connection and assigns a connection
ID for that connection on CPU_1
(ID=1).
② TCON on CPU_2 creates a
connection and assigns a connection
ID for that connection on CPU_2
(ID=1).
③ TSEND and TRCV on CPU_1 use the
connection ID created by the TCON
on CPU_1 (ID=1).
TSEND and TRCV on CPU_2 use the
connection ID created by the TCON
on CPU_2 (ID=1).
Manual, 11/2011, A5E02486774-04
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