Mitsubishi Electric MELSEC Q Series User Manual page 34

(3) System configuration based on load distribution.
(a) Distribution of processing
By distributing the high-load processing performed on a single QCPU over several CPU modules, it is possible
to reduce the overall system scan time.
Data processing (low speed)
Machine control (high speed)
QJ71C24-R2 QD75P1
RUN ERR. RUN AX1
NEU NEU
CH.1 SD SD CH.2
ERR
RD RD
AX1
CH. 1
All controls are executed with one QCPU.
(b) Distribution of memory
It is possible to increase the amount of memory used throughout the entire system by distributing the memory
used over several CPU modules.
Empty
memory
Used
memory
(4) Enables system configuration through function distributing
By distributing the functions, control for production line A and control for production line B is performed on differ-
ent CPU modules, allowing easy program development.
(Control in 1ms or less)
CPU module for machine control
Machine control speed is further increased with
load distribution according to the control cycle.
Figure 1.8 Distribution of processing
Figure 1.9 Distribution of memory
(Control in several to several dozen ms)
CPU module for data processing
QD75P1 QJ71C24-R2
RUN AX1 RUN ERR.
NEU NEU
CH.1 SD SD CH.2
ERR
RD RD
AX1
CH. 1
Empty
memory
Used
Extendable for each CPU module.
memory
Used
memory
One CPU module is added.
Empty
memory
Extension of program memory
Extension of device
CHAPTER1 OUTLINE
1
2
3
4
5
6
7
8
1 - 9