aikona
Member
I had a very strange problem :Two S7 412 communicating using 443 modules.One 443 is of type 6GK7 443-1EX11 V1.1 and the other is 6GK7 443-1EX40 V2.0 .Although the software (NetPro V 5.4) allows me to make a connection between the two using TCP the older module is not capable of communication via TCP but the UDP protocol has to be used.
I am sure that this is a bug connected to Step 7 V54. because V5.3 did not allow you to make a connection.
So in V5.4 you can make a connection .In diagnostics everything is ok But in the receive DataBlock the data is offset by 8 byte and repeats itself for the lenght of the DB.
example I send 20 bytes starting at DBB10 , I recieve 20 bytes starting at DBB18 and repeating at DBB48 ,DBB68 etc .Even worse if I set the lenght of the recieving 2 bytes longer ( which should not matter as the lenght is part of the telegram) then every time I receive data it is shifted by two byte.
I wasted a total of 4 hours on this stupid bug
Eric
I am sure that this is a bug connected to Step 7 V54. because V5.3 did not allow you to make a connection.
So in V5.4 you can make a connection .In diagnostics everything is ok But in the receive DataBlock the data is offset by 8 byte and repeats itself for the lenght of the DB.
example I send 20 bytes starting at DBB10 , I recieve 20 bytes starting at DBB18 and repeating at DBB48 ,DBB68 etc .Even worse if I set the lenght of the recieving 2 bytes longer ( which should not matter as the lenght is part of the telegram) then every time I receive data it is shifted by two byte.
I wasted a total of 4 hours on this stupid bug
Eric