Hello All,
I have the following problem: the whole explanation is in the picture. I do not know the S7-300 very well. Thank you.

Hello 

Did you checked the Profibus Address of the OB177 and The Buad Rate ?

Hello,

from my side I'm curious how you know that communication is lost. Next is, how you know that Profibus cable is ok, what you did to know about correct cable?

Hi all,

I'm back with my problem unresolved.

I do not have the original project.I uploaded station to pg, but OP¨177B not visible in HW.
In the configuration panel of the OP177B;
Profibus address; 4
Baud rate; 1,5Mbits / s.
No fault LED on CPU
No abnormal event in the CPU buffer diagnostic.
the cpu run perfectly.
The problem I have, in addition to the fault reported on OP177B in my first post, is the following ;
I have four keys on the OP177 that are programmed for production as a result;
Start production
Stop production
Manual production
Automatic production.
None of them work. Do not turn on when activated (not lit)
It is for this reason that I have advanced the idea that it is a problem of communication with the PLC.

Attached HW configuration uploaded from station;

Thanks for any help.

Best regards

mirip.

hello, no track to follow?

mirip.

Hello mirip;

Let's start by clarifying a few points, this will make the conclusion easier to appreciate.

On a Profibus network, a Siemens operator panel acts as a Profibus class 2 master, whereas the PLC acts as a master class 1. Look at these brief descrptions form Automation.com:

Introduction to Profibus-DP - Automation.com

Class 1 Master –

• Central controller that exchanges I/O data with connected slaves.
• Determines the baud rate (slaves auto-detect this rate).
• Manages the token transfer between masters.  Detects another master during the gap time.

Class 2 Master –

• Diagnostic, configuration, or startup tool.
• Can only control one slave at a time.
• Does not have write-access to the slave.
• Does not have a GSD file.

Now, for the consequence and conclusion: without the original operator panel program you have no tool to re-establish the Profibus link with the PLC. If the operator panel has been corrupted, you must downlaod a new configuration to the panel before the link to the PLC is restored.

Silly question: have you tried powering down the OP? It has happened in some of our projects that on restart the panel would read the original configuration and start up correctly. Then again, in many cases it would not, if the damage to the program was too great..

What software was used to program the OP 177B? Do you have it on your PC? You have the option of uploading with Prosave (found on the software CDs, or downloaded from the forum Profuct Support), but the uploaded program is compiled, cannot be opened with your programming software, and can only be transferred to a similar operator panel (same part number). If the original programmer allowed for a "back transfer", you could transfer it back to your programming software and open it, modify it and restore it to your OP. 

Hope this helps,

Daniel Chartier 

Hello mirip

Is there still running a HMI Runtime Project on the Panel? do you have changed something in the PLC Configuration??

-> Sure, we can look which Image Version is on the Panel, then we know which Engineering Software Version was used to program the Panel but wiithout the HMI Project you are quite lost.

Bye Murof

Hello, thanks for all.

I don't have original program and don't know what soft was used to program the OP177B  DP(6AV6 642-0DC01-1AX0) V 1.0  with inserted card  MMC+PLUS 128MB.(6AV66711CB000AX2)

I tried to connect to the OP (in transfer mode) with winccflex2008 to make a "back transfer" of the program, but impossible to get the connection, neither in MPI (adr: 1) nor in profibus (adr: 4) . I have the cable adapter A2  v1.4.

I do not know what to do.

Best regards,

mirip.

Hello mirip

first of all:

https://support.industry.siemens.com/cs/ww/en/view/28928853

Then the next step:

• OP 73
• OP 77 A
• TP 177 A
• KTP600 Basic Color DP
• KTP1000 Basic Color DP

(Sourcelink)

Perhaps it works with a siutable CP5711 or something else.

Or you do the backup to MMC Card directly on the panel.

But also with the Backup file you cannot do changes of the Project. The Backup includes only Runtime Files, no Project files!

Bye Murof