Siemens Multi Panel MP270 SIMATIC HMI Equipment Manual page 113

Number
280004 The online connection to the PLC has been
interrupted. There is no data exchange at present.
1)
The optional parameter %1 at the start of the message may contain an identification for the S7 connection
when several S7s are in parallel operation and are connected to diagnostics equipment.
2)
A WinCC channel provides the message texts via an interface. This text is issued via this message.
ProTool/Pro RT has no influence on this text.
3)
The specified text comes from the component resources.
MP270 Equipment Manual
Release 01/99
Effect/Cause
System Messages
Remedy
Check the PLC parameters in
ProTool Pro: baud rate, block
length, station address.
Check that the cable is plugged in,
the PLC is operational, the correct
interface is used.
Reboot the system if the system
message is displayed
continuously.
C-13