Operating The Programmable Controller That Has Been Stored - Mitsubishi Electric Q26UD(E)HCPU User Manual

13.4
Operating the Programmable Controller that Has been
Stored
When the programmable controller that has been stored with a battery removed or the programmable controller that
has been stored with a battery exceeding the guaranteed life installed is operated, data in the following battery-
backed-up-memories may be indefinite.
CPU module
*3
Memory card
SD memory card
*1 There are three batteries available: Q6BAT, Q7BAT, and Q8BAT.
*2 The program memory of the Universal model QCPU does not require battery backup.
*3 The Basic model QCPU and High-speed Universal model QCPU do not support the use of memory cards.
*4 Only the High-speed Universal model QCPU supports the use of extended SRAM cassettes.
Before restarting the operation, format the battery-backed-up-memories listed in above table using a programming
tool. ( Operating manual for the programming tool used)
After formatting the memories, write backup data to each memory.
To format the program memory during boot operation, select the "Clear Program Memory" checkbox in the Boot File
tab of the PLC parameter dialog box.
● Before storing a programmable controller, back up all the data stored in each memory. Write the data with a programming
tool before restarting an operation.
● When the programmable controller is powered on or the CPU module is reset, the CPU module initializes all of the
following data if an error is detected. Restarting an operation with initialized data may cause an unintended operation.
• Program memory data
• Standard RAM data
• Error history
• Latch data (latch relay (L), devices in latch setting range set in the parameter, special relay SM900 to SM999,
special register SD900 to SD999)
• Sampling trace data
● For the Universal model QCPU, when the latch data backup (to standard ROM) function is used, latch data such as
device data and error history data in the CPU module can be backed up without using a battery. Therefore, when a
programmable controller is stored with a battery removed, the stored data will not be lost.
264
Memory
Program memory
Standard RAM
(Including an extended
*4
SRAM cassette )
Standard ROM
SRAM card
Flash card
ATA card
Battery of a CPU Module
*2
---- (Battery backup not required)
×
---- (Battery backup not required)
---- (Battery backup not required)
---- (Battery backup not required)
: Battery backed up, ×: Not battery backed up
Battery
Battery built
*1
in a memory card
×
×