S5-100U
Diagnostics and Troubleshooting
5
Diagnostics and Troubleshooting
5.1
Indication of Errors by LEDs
The programmable controller's operator panel will show you if your device is not functioning
correctly (see Table 5-1).
Table 5-1. Error Indication and Error Analysis
Error Analysis
Error Indication
CPU in STOP
Red LED lights
CPU malfunction
Use the programmer to execute an interrupt analysis
(see section 5.2).
CPU in RUN
Green LED lights
Faulty operation
Program error
(see section 5.3)
or
I/O fault
Execute a fault analysis
(see section 5.4).
CPU in STOP
Red LED flashes
Error when loading or backing up the program
Use the programmer to execute an interrupt analysis
(see section 5.2).
If both LEDs light, your programmable controller is in the START-UP operating mode.
5.2
CPU Malfunctions
5.2.1
“ISTACK” Analysis Function
The interrupt stack is an internal CPU memory area where the causes of malfunctions are stored. If
there is a malfunction, a bit in the respective byte of the memory area is set. Using the pro-
grammer, you can read out the contents of this memory area byte-by-byte.
Calling the ISTACK
The call is made through the programmer menu in the STOP operating mode.
Refer to your programmer manual for the key sequence.
Note
Only ISTACK bytes 1 through 6 can be output in the RUN mode. There is no cause for
an interrupt to force the CPU to go into the STOP mode. The control bits are output in
bytes 1 through 6.
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5-1
Summary of Contents for SIMATIC S5-100U
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Page 505: ...B Dimension Drawings EWA 4NEB 812 6120 02b ...
Page 515: ...C Active and Passive Faults in Automation Equipment EWA 4NEB 812 6120 02b ...
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Page 523: ...D Information for Ordering Accessories EWA 4NEB 812 6120 02b ...
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Page 531: ...E Reference Materials EWA 4NEB 812 6120 02b ...
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Page 535: ...F Siemens Addresses Worldwide EWA 4NEB 812 6120 02b ...
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Page 543: ...Index EWA 4NEB 812 6120 02b ...
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