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117Chapter 8 Diagnostics and Fault Clearing
I/O Fault Table at the Remote I/O Scanner
If the programmer is communicating with a remote drop and in on–line mode, the I/O
Fault Table shows the remote drop rack and slot locations of the module where the
fault occurred, and a description of the fault.
Slot Number
Remote Drop
Rack Number
|PROGRM |TABLES |STATUS | | |LIB |SETUP |FOLDER |UTILTY |PRINT
1plcrun 2passwd 3plcflt 4io flt 5plcmem 6blkmem 7refsiz 8sweep 9clear 10zoom
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I / O F A U L T T A B L E
TOP FAULT DISPLAYED: 0001 TABLE LAST CLEARED: 09–21 08:00:00
TOTAL FAULTS: 0007 ENTRIES OVERFLOWED: 0000
FAULT DESCRIPTION: OPEN WIRE PLC DATE/TIME: 10–14 10:05:13
FAULT CIRC REFERENCE FAULT FAULT DATE TIME
LOCATION NO. ADDR. CATEGORY TYPE M–D H: M: S
___________ _____ _________ ___________________ ________________ _____ ________
0.4 %Q 00001 circuit fault discrete fault 10–13 08:12:22
0.5 %I 00002 circuit fault discrete fault 10–13 08:30:31
MAINPLC RUN/ENABLE 7MS SCAN ONLINE L4 ACC: WRITE CONFIG CONFIG EQUAL
PLC C: LESSON PRG: LESSON
REPLACE
Fault Clearing
From this display, all faults currently present in the remote drop can be cleared by
pressing the Clear key. However, this has no effect on the PLC’s fault table, or the fault
contacts associated with the remote drop, which are also located in the controlling
PLC. Clearing faults in this manner is therefore practical only when operating a
remote drop off–line. When on–line, all fault clearing should be performed from the
central PLC to keep the entire system in step, and up–to–date.