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The following procedure is used to clear memory completely.
Continue pressing
the CLR key once for
each error message
until “00000” appears
on the display
All clear
MEMORY ERR
I/O VER ERR
00000
00000MEMORY CLR?
HR CNT DM EM~
00000MEM ALLCLR?
00000
00000MEM ALLCLR
END
Partial Clear It is possible to retain the data in specified areas or part of the ladder program. To
retain the data in the HR and AR, TC, DM, and/or EM areas, press the appropri-
ate key after entering REC/RESET. HR is pressed to designate both the HR and
AR areas. In other words, specifying that HR is to be retained will ensure that AR
is retained also. If not specified for retention, both areas will be cleared. CNT is
used for the entire TC area. Press Shift + DM to specify the EM area. The display
will show those areas that will be cleared.
It is possible to retain some EM banks and clear others. See the explanation un-
der the heading “Clearing Selected EM Banks” on page 95.
It is also possible to retain a portion of the ladder program from the beginning to a
specified address. After designating the data areas to be retained, specify the
first program address to be cleared. For example, to leave addresses 00000 to
00122 untouched, but to clear addresses from 00123 to the end of Program
Memory, input 00123.
The key sequence for a partial memory clear is shown below.
Program Memory cleared
from designated address.
Retained if pressed
Both AR and HR areas
EM area
TC area
DM area
Preparation for Operation Section 4-6