Establishment And Termination Of Communications Relations - Siemens SIMATIC ET 200AL System Manual

Open User Communication

6.10 Establishment and termination of communications relations

6.10 Establishment and termination of communications relations
Establishment and termination of communications
The table below shows the establishment and termination of communications as part of open
communication.
Table 6- 5 Establishment and termination of communications
Setting up the connection
With the user program
By configuring a connection
92
Establishing communication
After downloading the user program to the CPUs:
The passive communications partner sets up the
local connection access by calling
TSEND_C/TRCV_C or TCON. Calling
TSEND_C/TRCV_C or TCON on the active partner
starts connection establishment. If the connection
could be established, there is positive feedback to
the instructions in the user program.
After you have terminated a connection using the
instruction T_RESET, the connection is reestab-
lished.
If the connection aborts, the active partner attempts
to re-establish the connection. This applies only if
the connection was successfully established before-
hand with TCON.
After downloading the connection configuration and
the user program to the CPUs.
Terminating communication
Using the TSEND_C/TRCV_C,
•
TDISCON and T_RESET instruc-
tions
When the CPU changes from
•
RUN to STOP mode
With POWER OFF/POWER ON
•
on a CPU
By deleting the connection configura-
tion in STEP 7 and downloading the
changed configuration to the CPU.
Function Manual, 12/2017, A5E03735815-AF
Communication