Run Write Target Storage Area - Mitsubishi Electric M800VW Series Manual

M800V/M80V Series PLC Development Manual
5 Peripheral Development Environment (GX Works2)
5.6 Developing Simple Project
 When the multi-project is enabled
The maximum number of executable steps in a high-speed processing program is fixed to 4,000 in total of all the projects,
regardless of the multi-project parameters. If the number of steps exceeds 4,000, NC will show an alarm and RUN write will
be disabled.
In addition, the whole sequence program execution area decreases by 8,000 steps. The number of steps of sequence
program storage area per project is calculated by subtracting 8,000 steps from the total size.
The following shows the relation between the settings and available number of steps for RUN write.
[Settings and available number of steps]
Setting of "Enable ladder pro-
gram writing during RUN"
High-speed
Main process
process
ON ON
OFF ON
OFF OFF
If high-speed processing program does not need to be written during RUN, the execution steps for a sequence program in
main processing program can be increased by setting OFF the bit selection parameter "Enable ladder program writing during
RUN (in high-speed processing)".

5.6.8.6 RUN Write Target Storage Area

The following table indicates the available storage areas for RUN write.
The operation target of RUN write is temporary memory storage. The RUN write is reflected in the PLC processor execution
area at the same time and is carried out.
A write to the storage area (in CNC) needs to be done separately using the ROM write operation. ROM writing operation is
available while PLC is running.
[RUN write target storage area]
Storage area
Temporary memory storage (RAM in
CNC)
Storage for execution
storage area (ROM in CNC)
(*1) Storage area is not updated at the time of conversion. A write to the storage area (in CNC) needs to be done separately
using the ROM write operation.
IB-1501614-B
High-speed processing program
[total of whole project]
High-speed processing program ≤ 4,000
steps
[per project]
(Total number of steps in high-speed processing program and main processing program) ≤ (Number of steps
in execution area multiplied by project ratio)
RUN write availability for each development environment
GX Works2
○ (when converted)
○ (when converted)
× (*1)
Number of steps available for execution
Main processing program
[per project]
Main processing program ≤
((Number of execution area steps - 8,000 steps) x project per-
centage)
GX Developer
○ (when converted)
○ (when converted)
× (*1)
146
Built-in PLC (built-in edit
function)
○ (when converted)
○ (when converted)
× (*1)