Omron CJ - PROGRAMMING MANUAL 08-2008 Programming Manual page 390

Battery-free Operation
CS1-H, CJ1-H, CJ1M, or CS1D CPU Units
CS1G/H-CPU@@(-V1) and CJ1@-CPU@@ Units
352
2. If a Battery is not connected or the Battery is exhausted, the following re-
strictions will apply to CPU Unit operation. This is true regardless of the
CPU Unit being used.
• The status of the Output OFF Bit (A50015) will be unreliable. When the
Output OFF Bit is ON, all Output Unit outputs will be turned OFF.
Include the following instructions in the ladder program to prevent all
Output Unit from outputs turning OFF when the power is turned ON.
First Cycle Flag
(A20011)
• The contents of I/O memory (including the HR, DM, and EM Areas)
may not be correctly maintained. Therefore, set the PLC Setup so that
the status of the I/O Memory Hold Flag (A50012) and the Forced Sta-
tus Hold Flag (A50013) are not maintained when power is turned ON.
• The clock function cannot be used. The clock data in A351 to A354
and the startup time in A510 and A511 will not be dependable. The
files dates on files written to the Memory Card from the CPU Unit will
also not be dependable.
• The following data will be all-zeros at startup: Power ON Time (A523),
Power Interruption Time (A512 and A513), and Number of Power In-
terruptions (A514).
• The Error Log Area in A100 to A199 will not be maintained.
• The current EM bank will always be 0 at startup.
• There will be no files left in the EM file memory at startup and the file
memory functions cannot be used. The EM file memory must be reset
in the PLC Setup and the EM file memory must be reformatted to use
it.
Battery-free operation is possible with normal operation. The user program
and parameter data are automatically backed up to flash memory in the CPU
Unit and are automatically restored from flash memory at startup. In this case,
the I/O memory will not be maintained and the DM and EM Areas must be ini-
tialized from the user program.
Battery-free operation is also possible by automatically transferring data from
a Memory Card at startup. (With a Memory Card, the DM and EM Area data
can be included.)
Battery-free operation is possible by automatically transferring data from a
Memory Card at startup. In this case, the I/O memory will not be maintained.
(With a Memory Card, the DM and EM Area data can be included.)
RSET
A50015
Section 6-10