DB Initial Values Problem

nbk

See if this helps you:
Try to change to Data view ( Open that DB -> View -> Data View). Here change the value for DB5.DBW0 in the "Actual value" column, Download the program to the PLC and then monitor the DB5.DBW0 in the S7-PLCSIM.

It works on that way, but that isn't good solution. I don't want to manually messing up in DB and downloading it on PLC every time when I reboot PLC and need initial values! I want to my variables being initialized to values in Initial Value DB field. It works with REAL, S5TIME variables, but with INT, WORD variables it's not! I don't know why!

Hi!

I have simmilar problem.

Before I used blocks which values are irrelevant.

Now I set DB with 8 bytes (4x INT) values 1 2 3 4

This DB is sent via FDL communication.

To my suprise, bytes 2 3 and 4 were sent with initial values but DBW0 has been sent as 0.

Why?!

After DB initialization it was OK. I just dont understand why first byte was set to zero and the rest was OK.

Also later, to see communication flow I load first byte to ACCU than "+I" and load it back again to DBW0.Again, without DB initialization it is started to count from 0, 1, 2 .... not from Initial value. DBW2, 4, 6 were sent as init values without Initializing DB.

vulpes

Hi!

I have simmilar problem.

Before I used blocks which values are irrelevant.

Now I set DB with 8 bytes (4x INT) values 1 2 3 4

This DB is sent via FDL communication.

To my suprise, bytes 2 3 and 4 were sent with initial values but DBW0 has been sent as 0.

Why?!

After DB initialization it was OK. I just dont understand why first byte was set to zero and the rest was OK.

Also later, to see communication flow I load first byte to ACCU than "+I" and load it back again to DBW0.Again, without DB initialization it is started to count from 0, 1, 2 .... not from Initial value. DBW2, 4, 6 were sent as init values without Initializing DB.

 Which PLC?  -  is it of the S7-300 / S7-400 generation? Is the retention of the DB and/or tag set as expected?