Seeking advice on Siemens PLC issues

2011-04-06View Original

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Configuration: CPU 412-2DP; Remote expansion: IM153-1. Fault phenomenon: The CPU EXTF and BUS2F lights are on (sometimes the EXTF light is not on while the BUS2F light is on); at this time, alarms are generated for the points connected to the DCS, before returning to normal immediately. The frequency is sometimes a few minutes, and sometimes a few hours. During notebook communication tests, it was observed that when problems occurred, the analog data at the site would become 0, only to return to normal immediately afterward. CPU fault diagnosis prompt: 1. I/O access error, reading 2. Distributed I/O: station response. Please give some guidance! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! (Severe electrical interference and loose wiring have been ruled out)

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Seeking advice on Siemens PLC issues

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