Mitsubishi Electric Q12DCCPU-V - Application Example of a Multiple CPU System; Data Exchange between CPU Modules; Access to a Non-Controlled Module; Access Range of Device Monitoring Utility

10
MULTIPLE CPU SYSTEM OVERVIEW
10.1 What is the Multiple CPU System?
10 - 3
9
DEVICE DESCRIPTION
10
MULTIPLE CPU SYSTEM OVERVIEW
11
MULTIPLE CPU SYSTEM CONFIGURATION
12
CONCEPT OF MULTIPLE CPU SYSTEM
13
COMMUNICATIONS BETWEEN CPU MODULES
14
PARAMETERS ADDED FOR MULTIPLE CPU SYSTEMS
15
STARTING A MULTIPLE CPU SYSTEM
16
TROUBLESHOOTING
(3) Application example of a multiple CPU system
The optimum load distribution system can be configured when programmable
controller CPUs process time-critical cyclic tasks and the C Controller module
performs processing of C language information.
By adding a Motion CPU to the multiple CPU system, motion control, sequence
control, and information processing (data processing and communication) can be
integrated into an advanced system.
(4) Data exchange between CPU modules
Since a multiple CPU system has a CPU shared memory for data exchange between
CPU modules, each CPU can read and write data from and to another CPU by using
the following function.
• Data communications using CPU shared memory ( Page 13-12, Section
13.3)
(5) Access to a non-controlled module
Each CPU module in a multiple CPU system can access a non-controlled module.
For example, CPU No.2 can read ON/OFF information of an I/O module and buffer
memory data of an intelligent function module that are controlled by CPU No.1.
To access a non-controlled module, enable the "I/O sharing when using Multiple
CPUs" in the <<Multiple CPU setting>> tab of C Controller module setting utility.
( Page 12-13, Section 12.4.2)
(6) Access range of Device monitoring utility
Each of the CPU modules installed in a multiple CPU system can be accessed from
Device monitoring utility.
For the access range of Device monitoring utility, refer to the following.
C Controller Module User's Manual (Utility Operation, Programming)
Figure 10.2 Application example of the multiple CPU system
Programmable controller CPU
Sequence control requiring high speed and fixed-cycle operations
Motion CPU
Motion control
C Controller module
Data processing
Data communications