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Start-up and Program Tests
4.4.2
Function of the Back-Up Battery
If the power fails or the programmable controller is turned off, the contents of the internal (retentive)
memory are stored only if a back-up battery is connected. When power is recovered or when the
programmable controller is turned on, the following contents are available:
•
Control program and data blocks (see section 7.3.5)
•
Retentive flags and count values (see section 2.2.1)
•
ISTACK contents (see section 5.3]
Note
•
Insert and replace the battery while the programmable controller is turned on.
Otherwise, an OVERALL RESET is required when you turn the programmable
controller on.
•
The lithium battery in the programmable controller has a life expectancy of at least
one year.
•
The yellow LED on the operator panel lights up if the battery fails.
Warning
Do not charge lithium batteries. They could explode. Dispose of used batteries properly.
4.5
Program-Dependent Signal Status Display "STATUS"
This test function displays the current signal states and the Result of Logic Operations (RLO) of the
individual operands during program processing.
You can use this test function to make corrections to the program.
Note
The current signal states are displayed only in the RUN operating mode.
4-8
S5-100U
EWA 4NEB 812 6120-02b
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Troubleshooting
