A
Appendix
A-3 Inner Workings of CP1L/CP1E
SYSMAC CP1L/CP1E Introduction Manual 113
Caution With an CP1E E-type CPU unit or with an N-type CPU unit without a Battery, the
contents of the DM Area (D) *, Holding Area (H), the Counter Present Values (C),
the status of Counter Completion Flags (C), and the status of bits in the Auxiliary
Area (A) related to clock functions may be unstable when the power supply is
turned ON.
*This does not apply to areas backed up to EEPROM using the DM backup
function.
If the DM backup function is being used, be sure to use one of the following
methods for initialization.
1. Clearing All Areas to All Zeros
Select [Clear Held Memory (HR/DM/CNT) to Zero] in the [Startup Data Read]
area in the PLC Setup.
2. Clearing Specific Areas to All Zeros or Initializing to Specific Values
Make the settings from a ladder program.
If the data is not initialized, the unit or device may operate unexpectedly because of
unstable data.