Performing An Overall Reset On The Programmable Controller - Siemens SIMATIC S5-100U System Manual

Start-up and Program Tests
START-UP Operating Mode
• The operating system processes DB1 and accepts the parameters (see section 9.1).
• Either the start-up organization block OB21 or OB22 is processed (see section 7.4.2).
• The amount of time start-up requires is not limited since the scan time monitor is not activated.
• Neither time-controlled program processing nor interrupt-driven program processing is possible.
• The input modules and output modules are disabled during start-up.
Changing Operating Modes
A change in operating mode can be caused by the following:
• The operating mode switch - when its position is changed.
• A programmer - if the operating mode switch on the programmable controller is set to RUN.
• Malfunctions - if one occurs that causes the programmable controller to go into the STOP
operating mode (see chapter 5).

4.1.3 Performing an Overall Reset on the Programmable Controller

You should perform an overall reset before you input a new program. An overall reset erases the
following:
• The programmable controller's program memory
• All data (flags, timers, and counters)
• All error IDs
Note
If you do not perform an overall reset, then the information indicated above is retained
even if the program is overwritten.
Manual Reset
To perform a manual overall reset, you must:
1. Set the operating mode switch to STOP.
2. Remove the battery.
3. Set the ON/OFF switch to "0".
4. Change the ON/OFF switch to "1".
5. Insert the battery.
Performing an Overall Reset with the Programmer
You can select the overall reset function from the programmer's menu line. Refer to the
programmer manual.
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S5-100U
EWA 4NEB 812 6120-02b