Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 326

(f) Timing when the setting is enabled
Any changed parameters take effect when:
• The CPU module is powered off and on.
• The CPU module is reset.
Any parameters in which the save destination memory and file size are changed in STOP state does not take
effect when the CPU module operating status is changed from STOP to RUN. In this case, the changed
parameters will take effect the next time when the CPU module is powered off and on or is reset.
(3) The number of displayed operation histories
The latest operation histories are displayed in the programming tool.
For the maximum number of displayed operation histories, refer to the following.
GX Works2 Version 1 Operating Manual (Common)
(4) Loss of operation history
Some operation histories may be lost in the following cases.
• The CPU module is powered off and on or is reset immediately after the operation to be saved is performed
(while the operation history is being written to the operation history file).
• Operations to be saved such as writing devices (writing to the operation history file) are frequently detected
in the system.
When an operation history is lost, "*HST LOSS*" appears in the operation code in the operation history window.
Whether any operation history has been lost or not can be checked in SM386 (Operation history information loss
flag).
(5) Devices to be saved
If the following devices are written, "Write Device" is saved in the operation history. Writing by index modification
or indirect specification is also saved. Although devices where the local device has been set are also saved, the
local device and global device cannot be distinguished by the stored device name.
X(DX), Y(DY), M, L, B, F, SB, V, S, T(TS, TC, TN)
*2 *2
D , W , SW, FX, FY, SM, FD, SD, Z, R, ZR, Jn\X, Jn\Y, Jn\B, Jn\SB, Jn\W, Jn\SW, Un\G, U3En\G
*1 Timer, retentive timer, and counter are displayed as TS, STS, and CS in contact, TC, STC, and CC in coil, and TN, STN,
and CN in current value.
*2 The extended data register and extended link register are included.
324
Device type
*1 *1
, ST(STS, STC, STN) , C(CS, CC, CN)
*1
,