Types Of Memory And Backup Data - Mitsubishi Electric C70 Setup Manual

MITSUBISHI CNC
4 CNC CPU Initial Setup

4.2.1 Types of Memory and Backup Data

An NC incorporates the four types of memory below.
SRAM (Static Random Access Memory)
This RAM stores data using a sequential circuit, such as Flip-Flop.
The SRAM contents are backed up by the battery.
FROM (Flash Read Only Memory)
This retains the contents even after turning the power OFF.
EEPROM (Electrically Erasable Programmable Read Only Memory)
This retains the contents even after turning the power OFF.
DRAM (Dynamic Random Access Memory)
This RAM stores data by accumulating charge on a capacitor. The contents are cleared when the power is
turned OFF.
This is used as the temporary data area and an area to apply FROM data in the NC system.
The table below lists the data to be backed up in each memory and shows whether it is the object to format, SRAM clear
or Backup/Restore.
Set "1" to "#1060 SETUP" and select "execute" to format.
Memory
Machining program
Fixed cycle program (Note 1)
Tool offset
Common variable
Parameter
SRAM
Workpiece offsets
CNC safety sequence
Operation history data
Tool life
Cycle monitor
Absolute position data (Note 2)
FROM APLC data
EEPROM Option (Note 3)
DRAM Sampling data
(Note 1) Fixed cycle program can be input/output only when #1166 fixpro=1.
(Note 2) For the restoration of the absolute position data, refer to the next page.
(Note 3) Options are updated by writing a parameter or SRAM data, only when it is not formatted.
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Data contents
ALL.PRG
O_.PRG
O_.PRG
TOOL.OFS
COMMON.VAR
ALL.PRM
WORK.OFS
USERPLC.LAD
TRACE.TRC
－
－
－
APLC.O
－
NCSAMP.CSV
Data name Format
○
○
○
○
Backup/
SRAM clear
Restore
○ ○
○
○ ○
○ ○
○ ○
○ ○
○ ○
○
○
○
○ ○
○