Reported Issue : Siemens HMI does not Communicate with Siemens1200 PLC.
Sequence Of Events :
Checked status of HMI and PLC and found that comm error on HMI.
Programm of PLC uploaded . HMI prg cannot be uploaded.
PLC and HMI programs upgraded to new version .
Even after upgradation no communication possible between HMI and PLC .
Communication tried with our brand new Siemens HMI and Old PLC .
Still no communication.
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