Hi friends
I am facing one strange problem these days.I have siemens S7 PLC communication and WinCC in our system.In PLC we are using DB121 for communicating with WinCC.
The codes in PLC (example)
A db121.dbx1.0( from WinCC button)
s db121.dbx5.0
When i click from HMI and set db121.dbx5.0 everything is ok.The system working normal.
But problem comes when i download db121 to plc without doing anything , db121.dbx5.0 is getting reset.
for checking purpose i changed the code as
A m1.1(permanent 1 bit)
s db121.dbx5.0
and download db121 to plc , db121.dbx5.0 doesnot reset.
I am facing one strange problem these days.I have siemens S7 PLC communication and WinCC in our system.In PLC we are using DB121 for communicating with WinCC.
The codes in PLC (example)
A db121.dbx1.0( from WinCC button)
s db121.dbx5.0
When i click from HMI and set db121.dbx5.0 everything is ok.The system working normal.
But problem comes when i download db121 to plc without doing anything , db121.dbx5.0 is getting reset.
for checking purpose i changed the code as
A m1.1(permanent 1 bit)
s db121.dbx5.0
and download db121 to plc , db121.dbx5.0 doesnot reset.