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Operating Behaviour
64
02/02 AWB27-1300-GB
Connection establishment
After each connection has been made, the active station
checks whether an identical “com_ref_n” communication
reference has been entered at the partner station. Service 31
Read Status is automatically started for this purpose. Once a
connection has been established and the stations have been
identified, the “ready” function block output indicates that
the telecontrol services can now be started.
If the identification is negative, the partner station
acknowledges this and indicates error code “40h“;
no services can then be transmitted.
Data communication between the “tra_dat” and “rec_dat”
now takes place in the range for which a valid
communication reference has been found.
Password
There are two ways of protecting a station against
unauthorised access:
Communication reference
Once a connection has been established, the stations
automatically check via the dial-up function blocks, whether
identical “com_ref_n” communication references have been
entered for the communication relation. A UINT is provided
for the value range (1 to 65535). Non-matching
communication references generate an error message.
Therefore only those stations sending a communication
reference with a corresponding reference for “com_ref_n”
FB inputs of the partner station can communicate with one
another.
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