2/17/2016 4:09 AM | |
Joined: 9/27/2006 Last visit: 9/19/2024 Posts: 12282 Rating: (2684)
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Hello jona; Whenever a fault LED is active on your CPU, it is recommended to open the diagnostic buffer of the PLC to read messages logged by the CPU's operating system that relate to all events of interest to the system. The OS also uses diagnostic OBs (OB86 for remote rack faults, OB 121 for programming errors,,,) to help it extend the basic diagnostics that are available. But the user must create and download the diagnostic OBs in the CPU program. For more details on the diagnostics of faults on the CPU, including the diagnostic buffer and the diagnostic OBs, please refer to chapter 23 (Diagnostics) of the following manual: SIMATIC Programming with STEP 7 V5.5 https://support.industry.siemens.com/cs/ww/en/view/45531107 One of the effects of the presence of the adequate diagnostic OB is that the OB's interface will capture the fault, but allow the CPU to continue running, while the error LED is set. This could be the situation you are experiencing now. Please save the buffer messages (Save AS..Text button) so you can transfer these to the forum as an attachment. That way we can read the contents of the vbuffer too and possibly help you understand what the PLC is complaining about. Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 2/17/2016 6:06:30 PM |
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