Dear Experts!

Advice required

S7300 CPU 2 DP 315 Master Slave Profibus.(2 CPU)

In My application I have to send data from Master to slave and slave to master but I can only be able to send data from Master to slave only via Profibus

Below attached program is running ok with 1- Profibus link ok

2-Data is receiving from master to slave non consistent and consistent data 3>4 Bytes

Please advise 1- how to send data from slave to master

Task Attempted: OB1 Use code for SFC 14-15 & SFC 20 for Slave in same way to transmit data to master but not got any result only master to slave side is working

2- Could we transfer real Float values from M-S /vice versa .Currently I have to do round first then move to Word or D-Word in Array DB.

Thanks!

Hello,

I suggest you to start with this FAQ is Master 400 and 300 slave but is the same.

DP link between CPU 315-2DP (slave) and S7-400 (master) with ...

Dear 

I started with the same Reference program each and every thing is same, only i have changed station s7300 Master instead of 400 and hardware  .Now i need to read data from slave to master.But  My program is working only from Master to slave ( i can only write data to slave  with current configuration).

Am i doing some mistake in Configuration,Registers or OB1 in M.S Program Code ?

engrtalha

Dear 

I started with the same Reference program each and every thing is same, only i have changed station s7300 Master instead of 400 and hardware  .Now i need to read data from slave to master.But  My program is working only from Master to slave ( i can only write data to slave  with current configuration).

Am i doing some mistake in Configuration,Registers or OB1 in M.S Program Code ?

 Hello,

there is some limitation with DP port of the CPU, you have to use I/O area and not DB to exchange data, for more information please have a look this thread below and in particular our expert dchartier:

Two 315-2DP CPUs Profibus Master-Slave communication - Entries ...

Dear Duris_I

Thanks a lot for your help.I was waiting to check mentioned configuration in system and yes it is working perfectly directly moved IO area Values in DB for Slave To Master.

But i am facing one limitation while creating IO  configuration for Master Slave it is showing error after 32/33 rows i.e "Rows exceeded error inconsistent configuration> But when rows reduced upto 32 then it is normal.As shown in attached picture

Thanks