Executing Sequence Program; Relationship Between Areas In Cnc And Storage Areas Selectable On Gx Works2 - Mitsubishi Electric M800VW Series Manual

M800V/M80V Series PLC Development Manual
5 Peripheral Development Environment (GX Works2)
5.5 Common Items

5.5.3.1 Executing Sequence Program

When executed, a sequence program transferred from GX Works2 or built-in PLC (built-in edit function) is processed as
follows.
 At the power ON
Data are transferred from the ROM in the CNC to the execution area in the PLC processor via temporary storage (RAM in the
CNC) before being executed.
Temporary storage
(RAM in CNC)
PLC RUN
ROM in CNC
The mode that prevents PLC RUN from being executed can be activated by the following operation.
 Set the rotary switch 2 of the CNC unit to "1". ("0" is set as default.)
 During PLC development
PLC data transferred from GX Works2 or built-in PLC (built-in edit function) are first stored in the volatile RAM for temporary
storage. After transferred to the execution area in the PLC processor prior to PLC execution, the sequence program is
executed.
The PLC data in temporary storage (RAM in CNC) are not retained after the CNC is powered OFF. To retain the PLC data
after power OFF, write the data to the ROM in the CNC. (Refer to "5.6.6 Writing Sequence Programs to ROM in CNC")
GX Works2
Transfer
When a sequence program is transfered from the temporary storage area to the execution area, the program execution format
is converted to that of the sequence program. Although the execution area of the PLC processor has twice the capacity of the
temporary storage area, PLC cannot be executed if the capacity exceeds the allowable range.
When the PLC cannot be executed, reduce the number of steps of the sequence program.
5.5.3.2 Relationship between Areas in CNC and Storage Areas Selectable on GX
Works2
This subsection describes the relationship between PLC data storage area in the CNC and the storage area selectable on GX
Works2.
For details on what data can be stored in which area, refer to "PLC Programming Manual".
PLC data that can be saved from GX
Works2
Sequence programs
Parameters
Device comments
PLC messages
Symbolic information (*1)
(*1) Files written to CNC when simple projects (with labels) or structured projects are used.
Execution area
in PLC processor
Built-in PLC (built-in edit function)
Convert
Temporary storage
(RAM in CNC)
Save
manually
PLC RUN
ROM in CNC
Memory selectable on GX Works2
Program memory/device memory
Program memory/device memory
Memory Card (RAM)
Execution area in
PLC processor
PLC data storage area in CNC
Sequence program storage area/Temporary stor-
age (RAM in CNC)
Data storage area/Storage area (ROM in CNC)
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