5 |
Non-Configurable Fault Group
The table below shows the
Fault Group
Table Type
Description
Fault Actions
Not Synchronized | Synchronized |
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SYS_BUS_FAIL | PLC | System bus failure. | Fatal | Fatal |
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NO_USER_PRG | PLC | No User's Program on | ||
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BAD_USER_RAM | PLC | Corrupted User RAM detected on | Fatal | Fatal |
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WIND_CMPL_FAIL | PLC | Window Completion Failure in | ||
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| Constant Sweep Mode (i.e., all windows |
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| failed to receive their allotted time). |
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PASSWD_FAIL | PLC | Password Access Failure. | ||
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NULL_SYS_CNFG | PLC | NULL System Configuration for RUN | ||
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| Mode. |
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CPU_SOFTWR | PLC | PLC CPU Software Failure. | Fatal | Fatal |
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| More than the allowable number of I/O |
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TOO_MANY_IOCS | PLC | Bus Controllers were found in the | Fatal | Fatal |
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| system. |
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| Communication failure during a store |
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SEQ_STORE_FAIL | PLC | operation by the programmer. This | Fatal | Fatal |
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| fault results when the |
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| sequence was received but not an end- |
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ADD_RCK | PLC | Addition of Extra Rack | ||
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ADD_IOC | I/O | Addition of or Extra IOC | ||
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ADD_IO_MOD | I/O | Addition of or Extra I/O Module | ||
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ADD_OTHR_MOD | PLC | Addition of, Reset of, or Extra Option | ||
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| Module |
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IO_MOD_FAULT | I/O | I/O Module Fault | ||
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CPU_HARDWR | PLC | CPU Hardware Failure | Fatal | Fatal |
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MOD_HARDWR | PLC | Module Hardware Failure (for example, | ||
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| Serial Port Failure on PCM |
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MOD_OTHR SOFTWR | PLC | Option Module Software Failure | ||
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PRG_BLK_CHKSUM | PLC | Program Block Checksum Mismatch | Fatal | Fatal |
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LOW_BATTERY | PLC | Low Battery in the System | ||
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CNST_SW_EXCD | PLC | Constant Sweep Exceeded | ||
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PLC_FTBL_FULL | PLC | PLC System Fault Table Full | ||
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IO_FTBL_FULL | PLC | I/O Fault Table Full | ||
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APPLICATION_FLT | PLC | User Application Fault | ||
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Fatal Faults on Both Units in the Same Sweep
It is very unlikely that a fatal fault would occur on both units in the same sweep. If that should happen, however, the CPU will consult the synchronized fault action table for one unit and the not- synchronized fault action table for the other. That will allow one of the units to stay in Run mode when the synchronized fault action is Fatal and the
Chapter 5 Fault Detection |
