Mitsubishi MELSEC Q Series User Manual

14
COMMUNICATIONS BETWEEN CPU MODULES
14.3 Data Communications Using CPU Shared Memory
14 - 8
9
UTILITY OPERATION
10
FUNCTIONS AND PROGRAMMING
11
OVERVIEW OF MULTIPLE CPU SYSTEM
12
MULTIPLE CPU SYSTEM CONFIGURATION
13
MULTIPLE CPU SYSTEM CONCEPT
14
COMMUNICATIONS BETWEEN CPU MODULES
15
PARAMETERS ADDED FOR MULTIPLE CPU
16
PRECAUTIONS FOR USE OF AnS SERIES MODULE
14.3 Data Communications Using CPU Shared Memory
(1) Data communications using CPU shared memory
This function enables data communications between the C Controller module and
CPU module using the CPU shared memory.
Use the bus interface functions to create the user program of the C Controller module.
The following describes the data communication methods using the CPU shared
memory and its selection.
(a) Data communication method using CPU shared memory
There are the following two methods for data communications using CPU shared
memory.
• Data communications using the auto refresh of the programmable controller
CPU or Motion CPU
• Data communications without using the auto refresh of the programmable
controller CPU
(b) Selection of data communication method
When making data communications using the CPU shared memory, select the
method according to the target CPU module type.
The following indicates whether data communications are available or not in each
data communication form.
Applicable, : Not applicable
(2) CPU shared memory structure
Refer to Section 14.3.1 for the CPU shared memory structure of the C Controller
module.
(3) Functions
The following indicates the functions used for data communications using CPU
shared memory.
* 1 The mdSend function can be used instead of the QBF_ToBuf function.
* 2 The mdReceive function can be used instead of the QBF_FromBuf function.
Table14.8 Applicability of data communications
Data communication form
Data communication method
Reference section
Auto refresh used Auto refresh not used
Between programmable controller CPU and C
Controller module
14.3.2,
14.3.3 (1)(a)
Between Motion CPU and C Controller module 14.3.2
Between C Controller modules 14.3.3 (1)(b)
Table14.9 Functions used for data communications using CPU shared memory
Function name Function
QBF_ToBuf
*1
Writes data to the CPU shared memory at the specified module
position and the buffer memory of the intelligent function module.
QBF_FromBuf
*2
Reads data from the CPU shared memory at the specified module
position and the buffer memory of the intelligent function module.

Mitsubishi MELSEC Q Series Specifications

General

Brand	Mitsubishi
Model	MELSEC Q Series
Category	Controller
Language	English