Step 7: Module start address

[Andrew Hardy]

I have an old Siemens program to modify. It was written in Step7 V5.5, and I want to use DP_SEND and DP_RECV (SFC14 and 15). I have downloaded from the Siemens website their example project "consistent"

In the help file for SFC14 I need to enter the CPLADDR (module start address) which it says can be found in the configuration table, looking in the example project it contains the value W#16#110 but I cannot see where in any of the hardware config this value appears.

So, where does the module start address appear in the hardware config?

 

[JesperMP]

Sorry but something does not match up.
SFC14 and SFC15 are DPRD_DAT and DPWR_DAT, not DP_SEND and DP_RECV.
So what exactly are you intending to do ?

Send and receive data consistently for Profibus or Profinet devices that address I/O in blocks greater than 4 Bytes, and via the integrated DP or PN port ?
In that case DPRD_DAT and DPWR_DAT.

Update the process image of a CP345-2 or CP343-1 for the attached DP or PN IO ?
In that case DP_SEND and DP_RECV.

 

[Andrew Hardy]

My mistake, sorry!
The example program uses DP_SEND and DP_RECV, not DPRD_DAT and DPWR_DAT

However the question is still the same - where is the module start address in the hardware config?

 

[JesperMP]

And my questions also have not changed.

So what exactly are you intending to do ?
Send and receive data consistently for Profibus or Profinet devices that address I/O in blocks greater than 4 Bytes, and via the integrated DP or PN port ?
[or]
Update the process image of a CP345-2 or CP343-1 for the attached DP or PN IO ?

 

[Andrew Hardy]

I need to transfer ~30 bytes from the master to the slave and ~ 16 bytes from the slave to the master. If possible I would like this to appear as IO at either end, but if that is not possible, then I will set up DBs for send and receive at either end. The DP port is the one on the processors, the master is a 315-2 DP and the slave is a 314C-2DP

 

[JesperMP]

In that case it is DPWR_DAT and DPRD_DAT in both PLCs, or arrange the addresses within the process image of either PLC.

In the 314C-2DP you have to configure the MPI/DP port as DP slave and setup the transfer areas.
In the 315-2DP you have to add the 314C-2DP from the 'configured stations' to the DP network. If the 315-2DP and 314C-2DP are in separate STEP7 projects you have to create a dummy 314C-2DP in the 315-2DP project.

If the IO addresses are outside the process image in either of the PLCs you have to use DPWR_DAT and DPRD_DAT in the respective PLC.
LADDR is the first logical address of the consistent input or output that are to be transferred.

edit: If you chose the IO addresses within the process image, then you can use the IO addresses directly.
Make it easy for yourself and do that.

 

[Andrew Hardy]

I've set it up so that the master slave IO addresses are within the PIO range on both PLCs. The parameter that I (still) can't see / work out is CPLADDR the start address of the module, rather than LADDR (the start address of the IO bytes configured for the module)

 

[JesperMP]

You dont need DPWR_DAT and DPRD_DAT if the IO addresses are within the PIO.