Dear Goblin,

download the MBMA341 blocks from here:

https://support.industry.siemens.com/tf/ww/en/posts/modbus-rtu-master-for-cp340-341-441-x-no-dongle-required/111091/?page=0&pageSize=10

These ones should work 

If you use the format function of the block you don't need to swap the words manually.

Best Regards.

TIBI68

download the MBMA341 blocks from here:

https://support.industry.siemens.com/tf/ww/en/posts/modbus-rtu-master-for-cp340-341-441-x-no-dongle-required/111091/?page=0&pageSize=10

These ones should work 

 TIBI68 do you suggest me to use MBMA341 block (from MBMA341.zip) instead of MBMA340 (from MBMA340.zip as I've used)? I have CP340 module, not CP341.

goblin 

Sorry Gobln, my mistake.

Try to make the following change in the Interface Parameter

Receiving Data

Deselect / remove the tick from "PREVENT OVERWRITING"

Good Luck.

TIBI68

Sorry Gobln, my mistake.

Try to make the following change in the Interface Parameter

Receiving Data

Deselect / remove the tick from "PREVENT OVERWRITING"

Good Luck.

 When I try to do this I get message "'Prevent Overwriting' cannot be deselected if the number of receive message frames is greater than 1" (I have default 250)

Should I change Buffered Reveive Message Frames to 1 and then deselect "Prevent Overwriting"?

Thanks

goblin

Yes please, change the buffer size to 1 and then deselect.

I hope this helps because I could not find any error in your program.

Good luck.

TIBI68

Yes please, change the buffer size to 1 and then deselect.

I hope this helps because I could not find any error in your program.

 Done.

I also hope this helps :) If not I'll try with Moxa Profibus/Modbus gateway.

Thanks

goblin

Good day Goblin,

I hope its working now.

MOXA has good solutions and Hilscher https://www.hilscher.com/ too.

Best Regards.

TIBI68

Sorry Gobln, my mistake.

Try to make the following change in the Interface Parameter

Receiving Data

Deselect / remove the tick from "PREVENT OVERWRITING"

Good Luck.

Hello again

TIBI68, unfortunately just now it has happened again. The same errors in diagnostics - trying to open 16385 DB number (4001 in HEX)...

Performing warm restart wasn't enough to launch the PLC, I had to clear memory first.

goblin

I am very sad to hear that .

It is not easy to troubleshoot on that issue remotely and for you due to the missing source code.

For that reason I am planning to open my code for all users very soon.

So users have the chance to improve on the code for stability, compatibility and support in fixing bugs.

Best Regards.