Mitsubishi A1SJH(S8) User Manual page 72

4. CPU MODULE
(Continued)
Function (application)
Sampling trace
Performs chronological
checking to the operation
status of setup devices
when debugging or an
abnormal operation is
detected.
Clock
Program control by clock
data/external display of
clock data
Offline switch
Priority order of LED indication
Changing priority order of
display/canceling display
Self-diagnostics function
•An abnormal behavior of
the CPU module
•Preventive maintenance
Description
• With respect to a device for which the sampling trace is set
up, the operatinon condition of the device is sampled for the
number of times specified per scan or per hour, and the
results are stored in the sampling trace of the CPU main
module.
• Sampling trace is performed by the STRA instruction in the
sequence program.
• Executes the operation of the clock built into the CPU
module.
• Clock data: year, month, day , hour, minute, second, day of
the week
• When the clock data read request (M9028) is ON, the clock
data are read out and stored in D9025 to D9028 by the clock
element after the END processing of the sequence
operation.
• The clock elements are backed up with the batteries in the
CPU main module.
• Allows the device (Y, M, L, S, F, B) used with the OUT
instruction to be disconnected from the operation processing
of the sequence program.
• For ERROR LED indication except for operation stop,
changing the order of display/canceling the display are
executed.
• When an error that matches one of the self-diagnostics
items is generated at the CPU module power on or during
RUN, it prevents malfunctions by stopping the CPU module
operation and indicating the error.
• Stores the error codes corresponding to the self-diagnostics
item.
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Overview of Setting and Operation
• Set-up of the memory capacity for
sampling trace is performed by the
parameter setting of peripheral
devices.
• Set the device which executes
sampling trace, trace point, and
number of times using the
peripheral devices.
• Using the peripheral devices,
monitor the result of the sampling
trace.
• Sets data for D9025 to D9028 by a
peripheral device, turns M9025 ON,
then writes the data to the clock
element.
• Writes to the clock element by the
sequence program. (Dedicated
instructions can be used.)
• Use the test function fitted with the
peripheral devices for set-up.
• Writes data as to whether to
change the order/cancel the display
to D9038 or D9039 by the
sequence program.
• There are some self-diagnostics
items with which the operation can
be continued or stopped by the
setting of peripheral device
parameters.
• Reads out the error codes with the
peripheral device and performs
troubleshooting.
(Refer to Section 4.1.4)