Hello everybody

I use cpu 1500 with 485/422 hf cp card with modbus master that connected to 1 slave. I did the connection at my office and everything worked fine, but when I went the client site, I got error 80C8. I tried to change the transmission and swap A and B. but I still got same error. I did everything I know but still nothing. 

I went back to my old wiring which is worked for me, but now it doesnt work with same error,. I need help

is there any static value need to be change to get rid of this error?

regards

hello

I did, I really couldnt find answer to my case. please I  need help

 Maybe you can share your configuration settings here so that someone can look at it. 

Thanks,

Jay

T_Ebrahem

hello

I did, I really couldnt find answer to my case. please I  need help

hello,

here is my project, It was working, but now its not. I didnt change anything

TIA v13 sp1 update9

regards

Kaulquappe

for example this one

 thank you

still no luck, I use a terminal on my PC and the sensor work fine so the configuration parameters are correct and it worked to me before, now even if I go to the old working setup, it doesnt work anymore and it gives me the same error. I try to use Send and Receive P2P functions and  I see that the receive status always 7002. so also no luck.

regards

T_Ebrahem

Hello

I tried many suggestion from posts who got the same error. however, I still unable to solve the problem.

The wiring is working with the S7-300 and CP 341. so I cannot think of anything wrong with the wiring

Regards

T_Ebrahem

if your problem still continues I had the same problem

I erased the modbus comm load and modbus master with their intance db's and rewrite them again

80C8 problem solved but have another problem