10
FUNCTIONS AND PROGRAMMING
10.3 Programming Using MELSEC Data Link Functions
10.3.12 Accessible ranges and devices of MELSEC data link functions
10 - 48
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
10.3.12 Accessible ranges and devices of MELSEC data link functions
This section explains the accessible range and devices for use of the MELSEC data link
functions.
(1) Multiple CPU system access
The following explains the accessible range and devices at the time of multiple CPU
system access.
(a) Accessible range
In a multiple CPU system, the C Controller module can access the self station (C
Controller module) and programmable controller CPUs in the system only.
(b) Accessible devices
The following explains the accessible devices at the time of multiple CPU system
access.
POINT
1. The words, Batch and Random in the table indicate the following.
Batch : Batch write (mdSend function) and batch read (mdReceive function)
Random: Random write (mdRandW function), random read (mdRandR
function), bit set (mdDevSet function) and bit reset (mdDevRst
function)
2. Bit set (mdDevSet function) and bit reset (mdDevRst function) can access
only the bit devices.
3. The CPU shared memory is accessible only when multiple CPU setting have
been done.
Figure 10.22 Accessible range in multiple CPU system
C Controller module
CPU
No.1
CPU
No.2
CPU
No.3
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