Battery-Free Operation - Omron CS1G/H-CPUxx-EV1 Programming Manual

Battery-free Operation

6-10 Battery-free Operation
CPU Unit
No initializing DM and
EM Areas at startup
CS1-H, Use normal operation (using flash memory) or a
CJ1-H, Memory Card.
CJ1M, or
CS1D
CS1 or CJ1 Use automatic transfer from a Memory Card at
startup. (Turn ON pin 2 of DIP switch.)
Note
342
The CS-series and CJ-series PLCs can be operated without a Battery
installed (or with an exhausted Battery). The procedure used for battery-free
operation depends on the following items.
• CPU Unit
• Whether or not I/O memory (e.g., CIO Area) is maintained or not
• Whether or not the DM and EM Areas are initialized at startup
• Whether or not the DM and EM Areas are initialized from the user pro-
gram
The above differences are summarized in the following table.
Not maintaining I/O memory
Initializing DM and EM Areas at startup
From user program
1. When using battery-free operation, disable detecting a low battery voltage
in the PLC Setup regardless of the method used for battery-free operation.
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.
Not from user program
Use automatic transfer Not possible with any method.
from a Memory Card at A Battery must be installed.
startup. (Turn ON pin 2
of DIP switch.)
RSET
A50015
Section 6-10
Maintaining I/O memory