ayman metwally
Lifetime Supporting Member
Dear Sirs
I have a major problem that I have a SIEMENS S5 (928-135 u) and I cannot make any communications with this mentioned CPU through the programming port.
Actually iam using an OPC server that talks to the programming port (AS511 protocol)for a SCADA application.
It worked fine for about a weak.
Now I cannot communicate with the CPU. So (for trouble shooting) I connected the PG directly to the programming port in the CPU but still there is no communications.
So now i cannot program the PLC .. what a nightmare !!
Please note the following:
1- The PLC now is running normally and acquiring data through it's input cards and sending orders through the output cards, So there is no probability that the PLC is not working.
2- I used two PG units for testing and they are working fine with other PLCs.
3- Cables are also fine as I tested it with other PLCs.
So for now I think that the programming port is damaged.(Am I right??)
Is there are any other probability ??
I am asking you for advises as I do not know what to do (This PLC is in a Power plant so I am having hard time searching for a solution)
Thanks in advance
I have a major problem that I have a SIEMENS S5 (928-135 u) and I cannot make any communications with this mentioned CPU through the programming port.
Actually iam using an OPC server that talks to the programming port (AS511 protocol)for a SCADA application.
It worked fine for about a weak.
Now I cannot communicate with the CPU. So (for trouble shooting) I connected the PG directly to the programming port in the CPU but still there is no communications.
So now i cannot program the PLC .. what a nightmare !!
Please note the following:
1- The PLC now is running normally and acquiring data through it's input cards and sending orders through the output cards, So there is no probability that the PLC is not working.
2- I used two PG units for testing and they are working fine with other PLCs.
3- Cables are also fine as I tested it with other PLCs.
So for now I think that the programming port is damaged.(Am I right??)
Is there are any other probability ??
I am asking you for advises as I do not know what to do (This PLC is in a Power plant so I am having hard time searching for a solution)
Thanks in advance
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