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Siemens S5-100U - Diagnostics and Troubleshooting

Siemens S5-100U
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5 Diagnostics and Troubleshooting
5.1 Indication of Errors by LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 1
5.2 CPU Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 1
5.2.1 “ISTACK” Analysis Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 1
5.2.2 Interrupt Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 5
5.2.3 Errors during Program Copying . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 6
5.2.4 Explanation of the Mnemonics Used in “ISTACK” . . . . . . . . . . . . . 5 - 7
5.3 Program Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 9
5.3.1 Locating the Error Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 9
5.3.2 Tracing the Program with the “BSTACK” Function . . . . . . . . . . . . 5 - 12
5.4 I/O Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 14
5.5 System Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 14
5.6 The Last Resort . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 15
EWA 4NEB 812 6120-02

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