MODBUS RTU MASTER FOR CP340/341/441-X (NO DONGLE REQUIRED)

Dear TIBI68,

I am trying to migrating your CP341 program to TIA portal V11 from step7. But i am having problems in that. FB10 was migrated easily but when i added FB10, FB7 and FB8, it was showing errors and aborted. 

I will really appreciate your kind help on this. Thank you.

Best Regards

Lohana Jack

hello all

can I use cp313c-2ptp as modbus master (because it has protocol ASCII) instade of cp 341

Hi all

I am new in modbus and need some help to make a modbus RTU master cpu 315 2DP and cp is 341-1ch02-0ae0 without dongle.

I used Dear TIBI68 program and changed libraries but TX and RX Led on cp is off.

if i disconnect the cable TX led should blink or not?

hello

I faced same your problem,status output at MBMAREQ gives error code E006h

so we need experts to help us

hello

the first comments under this topic refers to our friend TIPI68 sent some changes on library to others by email

Hi all. first of all I want to say it again, thank you Tibi68.

I'm comunicating with several slaves and everything is ok. But now, I'm trying to add a new slave to the net and I can't. It givesme status w#16#8300. someone knows what is this?

thank you.

Hi again. I know which is the problem. If I write 42001 address, FB10 comunicate 2001 and function 03. This slave needs 42001, whitout subtract 40001. Tibi68, can I open the library for look for a solution?

thank you.

Hi

Thanks for a simple and easy way to implement Modbus on Siemens. I tested this code successfully in S7-300 and now I want to use in a PCS7 system. Previously I used Modbus successfully with ET200S. Now we change the ET200S by ET200M with CP341. The problem: in the existing program the CFC library is also used, the FB's numbers are busy and we can't change (FB2: CONT_S, FB3: PULSEGEN and FB8: R_TRIG).

Is possible to make an alternative source with other FB's numbers on Siemens standard functions for easy integration on systems with CFC (for example: FB32 and FB33 for CP340; FB37 and FB38 for CP341)?

Best Regards.

Dear All,

                I have some queries about this library. I have ten  CP341 with dongle with modbus master & on each master connected with  10-12 modbus slaves.

               Is it is possible to call multiple FB-"MBMA341" for each CP in cyclic OB35 & multiple FB-"MBMAREQ" block for there respective slaves in OB1?

               Is this block use full for CP341 with RTU mode?

Thanks & Regards,

Mahesh Nakade