Hello everyone,

I am new in siemens,

and I am working on a project where I need to increase the Modbus table, I have done the procedure and forwarding the correct DBS for this purpose, but I think also need go to another DB say what range I want to work now.

 Ex:

before used Modbus addresses 40000-41760, and now need to use 40000-41850.

where I can make this alteration to extend the table and plc recognise new table?

thank you

xtmoli

I have a plc s300( cpu 315 )

in S7, with  simatic manager v5.4.

thks

Hi

 Is communication via CP343.... i think....

i have no manual, send a prtsc .

thanks

Hello Kaulquappe

thanks for your help and sorry these vague questions,

  but it's my first time in siemens plc and the first in Modbus.

I have 10  cpu 315, in networked and everyone has CP343 cards,  only the main cpu (gateway) has one CP 343 and two CP341.

Already read some Modbus manuals, but when I try to find those blocks in the gateway, i dont find or i find diferente kind .

I will serch for manuals is this site, tham will talk to you again,ok?

many thanks

xtmoli

thks

hello,

From what I see ,  i believe that I'm using Modbus rtu, and  my plc is slave, and the Dcs the Master.

There are some way to confirm  this information inside plc?

tlh,

regards