Accessible Ranges And Devices Of Melsec Data Link Functions - Mitsubishi MELSEC-Q Series User Manual

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FUNCTIONS AND PROGRAMMING

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
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- 51 10.3 Programming Using MELSEC Data Link Functions
10.3.12 Accessible ranges and devices of MELSEC data link functions
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 own station (C
Controller module) and programmable controller CPUs in the system only.
Figure 10.22 Accessible range in multiple CPU system
(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 and mdSendEx functions) and batch read
(mdReceive and mdReceiveEx functions)
Random: Random write (mdRandW and mdRandWEx functions), random
read (mdRandR and mdRandREx functions), bit set (mdDevSet and
mdDevSetEx functions) and bit reset (mdDevRst and mdDevRstEx
functions)
2. Bit set (mdDevSet and mdDevSetEx functions) and bit reset (mdDevRst and
mdDevRstEx functions) can access only bit devices.
3. The CPU shared memory is accessible only when multiple CPU setting have
been done.
C Controller module
CPU CPU CPU
No.1 No.2 No.3