Process interfacing via an automation system (PLC, PC)
10.4 Control with FB79
SIMATIC MV420 / SIMATIC MV440
Operating Instructions, 04/2013, A5E02371045-06
279
Reaction to disruptions, timeouts and errors
The reader performs the following monitoring functions:
● The time between the arrival of two acknowledgements of the I/O controller is monitored
for the value configured in the Connections ➜ Interfaces ➜ PROFINET IO ➜ Time limit
window.
● The correct order of the data packets acknowledged by the I/O controller is monitored.
If an error occurs, the reader enters B#16#FF in byte 1 of the "Send" user data interface
which causes the current data transfer to abort.
Siemens recommends that you implement the following monitoring functions in the user
program of the I/O controller.
● Monitor the time between the arrival of two consecutive data packets.
● Monitor the correct order of the data packets sent by the reader.
● Check whether the total length of the user data actually transferred matches the net total
length indicated by the reader at the beginning of the data transfer.
If an error occurs, you can abort the current data transfer by writing B#16#FF to byte 1 of the
"Receive" user data interface.
10.4.4 Function block 79 "VS130-2_CONTROL"
To control the functions of the reader, there is a function block FB79 for PROFINET IO
operations.
In addition to the SIMATIC S7 system mechanisms for integrating the reader in a PROFINET
IO environment, FB79 makes the software integration in control programs easier.
Note
• The description of the support provided by FB79 and the associated user data interface is
mainly to retain compatibility with the VS130-2 reader.
• The integration design with the highest performance is based on the Ident profile with or
without a communication module. Siemens recommends the use of this concept for new
plants.
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