Could you help me with next problem?

I use TDC CPU555.

We have to receive Data telegram from Cameras PLC (Beckhoff)by TCP/IP.

It’s 4 different telegrams (length 60, 212, 164, 164 bytes).

The cameras PLC send date to one Port (2001).

I have problems with receiving different length telegrams by one Port.

I’ve tried to use CRV_P or CRV blocks, they work equally.

I decided to use big buffer for date. I set TlgLength = 300 (because I have the biggest telegram = 212 byte).

But, CRV_P or CRV blocks work in the following way:

The first telegram, for example length 60 byte copy to 0 … 60 bytes in buffer.

Next telegram, for example length 60 byte copy to 61…120 byte, not to 0…60 bytes in buffer.

Next telegram, for example length 212 byte copy to 121-300 and 0…32 bytes

I’ve tried different MODE (H,R), but they work the same way. Mode S and M get communication error.

Could you tell me how to set up the reception of different telegrams at the beginning of the buffer?

Or how to solve this problem?

KSN, thanks for you answer.

In the manual -A restart must be performed to activate the changes!

But restart isn't possible.

Thank you.

Of course, I can make restart, but I receive 60 byte every 5 second and other telegrams are not predictable. 

Then I have to work without stop 2-3 days.

If I could reset only CRV/CRV-P or reset this buffer, after I would receive one telegram. 

shenkris

Thank you.

Of course, I can make restart, but I receive 60 byte every 5 second and other telegrams are not predictable. 

Then I have to work without stop 2-3 days.

If I could reset only CRV/CRV-P or reset this buffer, after I would receive one telegram. 

 As I know, if you have change the buffer size, you must restart the TDC, otherwise it will not take any affact.

Hello.

Thanks for your answers.

I've tried to operate with EN connector. Switching off after receiving one telegram. And next cycle switching on. But it did not help. The module CRV/CRV_P still copies data not from the beginning of the buffer.

When I've tried to copy Zero DB I got communication error.