System Parameters; The Plc Does Not Enter The "Run" Mode - Siemens SIMATIC S5-90U System Manual

S5-90U/S5-95U
5.6

System Parameters

The "SYSPAR" programmer function can be used to read the system parameters (e.g. PLC
software version) of the PLC (see Programmer Manual).
5.7

The PLC does not Enter the "RUN" Mode

Suppose the programmable controller cannot be brought into the "RUN" mode although all feasible
causes of errors concerning parameterization (DB1) and the STEP 5 program can be excluded.
Possible cause: The battery has been installed or replaced when the programmable
controller was switched off.
Remedy: Perform an overall reset (see Section 4.1.3) and load the program again.
EWA 4NEB 812 6115-02b
Diagnostics and Trouble Shooting
5-13