10. easyE4 communication Connection to other devices
10.17 Modbus TCP
Values are only allowed to be written if all required addresses are valid and
unlocked.
*For an error message, it is sufficient if only one of the requested addresses is not
unlocked or is invalid.
**A write operation can always write consistent data to the image table, since this
data is protected from other modules by semaphores. In other words, as of this writ-
ing, there is no known criterion for a "write multiple registers" error in the server.
Unknown function:
If the client requests an unsupported function, the Modbus TCP server must return
the following error frame after receiving the request:
Fault Code
1 byte
0x80 + Function code
Exception Code
1 byte
01
This will indicate to the client that the desired function is not supported by the server.
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