9.
9 - 10
MAINTENANCE FUNCTION
9.4 Error History
QnACPU can record the results detected by the self-diagnostics function with the
detection time in memory as an error history.
(1) Storage area
(a) The latest 16 errors are stored in the error history storage memory of the CPU
module, which is latched.
(b) In the case of storing more than 16 errors, they can be stored to files in a
memory card by making the appropriate setting in the PC RAS settings in the
GPP function parameter mode.
(c) If a discrepancy arises between the parameters and memory card error history
when executing 1) or 2) below, the contents of the error history files are cleared
first, and the 16-point data of the fault history storage memory of the CPU is
transferred to the history file.
1) The number of error records in the history file as set in the parameters is
changed part way through.
2) A memory card whose capacity does not match the number of error records
set in the parameters is installed.
(d) The following shows the storage area for the error history file:
*1 When the number of errors that can be stored is exceeded, the oldest error record is cleared
and the newest one stored in the same place.
(2) Clearing the error history
The error history is cleared by using the error history clear function in the PLC menu
in the PLC diagnosis mode of GPP function.
The error history clear function erases all details in the error history storage memory
of the CPU module and in the error history file of the memory card.
POINT
Since the internal clock of the QnACPU is used for setting the detection time, be
sure to set the correct time before using the CPU module. (Refer to Section 10.5
for setting method of the clock.)
Storage area File in set memory card
Number of storable error records
Max. 100 (can be changed)
*1
POINT
Even if the error history file set in the parameters does not exist in the memory
card, no CPU module error occurs.
The CPU module performs only the processing that stores errors in the error
history storage file.
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