High-Speed Ram Operation Function - Mitsubishi Electric CR750-Q Instruction Manual

5.18 High-speed RAM operation function

When using the high-speed RAM operation function, some restrictions apply to the program operation and
data saving. Thoroughly understand the specifications before using this function.
(1) Overview
The robot programs are saved in the RAM (SRAM), which is backed up by the battery.
These programs can be executed with SRAM operation or DRAM operation. Select the operation method
with parameter: ROMDRV. The default setting is DRAM operation (high-speed RAM operation). DRAM
operation can execute at a faster speed (maximum 1.2 times faster than SRAM operation), but some restric-
tions apply to the saving of variables used in the program when shutting the power off.
Restrictions
SRAM operation: All variables are saved.
DRAM operation: The program's external variables are saved. The local variables and user-defined
Select the robot program operation (DRAM operation or SRAM operation) according to the application.
Change the parameter: ROMDRV shown in
83, "3.15 Operation of parameter screen"
Table 5-14:List of ROM/high-speed RAM operation parameters
Parameter
ROMDRV Switches the program execution (operation) between SRAM operation and DRAM operation.
0= SRAM operation
2= DRAM operation (default value)
Table 5-15:Role of each memory and relation of ROMDRV parameters
Memory
Feature
type
SRAM Data not lost at power off
Data lost when batteries are
spent
Read/write enabled
DRAM
High-speed execution
possible
Data lost at power off
Note1) Program control operation refers to operations such as copying, deleting or renaming the program in the
controller using the T/B or personal computer support software.
Note2) System data saving includes "parameter save", "error log save", and the data files read and written by the
program (OPEN/PRINT/INPUT).
external variables are discarded.
Table
for details on changing the parameters.
Execution of programs
(Discard the execution result)
Program control operation
System data read/write
Common variable read/write
Program read/write
5-14, and then turn the power off and on. Refer to
Description and value
ROMDRV
0 (SRAM mode)
Note1)
Note2)
High-speed RAM operation function 5-499
5Functions set with parameters
parameter
2 (DRAM mode)
Program control operation
Note2)
System data read/write
Common variable read/write
Program read/write
Program execution
(execution results discarded)
Page
Note1)