Mitsubishi Electric C70, Setup Manual

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4 CNC CPU Initial Setup
MITSUBISHI CNC
78
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.
(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.
Memory Data contents Data name Format SRAM clear
Backup/
Restore
SRAM
Machining program
ALL.PRG
O_.PRG
○ ○ ○
Fixed cycle program (Note 1) O_.PRG ○ ○
Tool offset TOOL.OFS
○ ○ ○
Common variable COMMON.VAR ○ ○ ○
Parameter ALL.PRM
○ ○
Workpiece offsets WORK.OFS ○ ○
CNC safety sequence USERPLC.LAD ○ ○
Operation history data TRACE.TRC ○
Tool life
－ ○
Cycle monitor － ○
Absolute position data (Note 2) － ○ ○
FROM APLC data APLC.O
EEPROM Option (Note 3) － ○
DRAM Sampling data NCSAMP.CSV