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9
PROGRAMMING USING BUS INTERFACE
FUNCTIONS
9.6
Precautions for Functions
This section provides precautions for the bus interface function and MELSEC data link
function.
(1) Endian format (Memory layout)
There are two types of models for the Q06CCPU-V(-B), which are in little endian
format (memory layout) and in big endian format.
Create user programs in either little or big endian that is appropriate to the model
used.
(Set the compiler by selecting "A toolchain" when creating a project on Tornado.
(
(2) Execution type priority
Set the priority of a task for executing the FTP user program as described below.
(a) When access is not made via FTP during user program execution
(b) When access is made via FTP during user program execution
(3) User program execution
Execute a user program by starting a task from the script file.
(
The system may malfunction if the user program is executed without a task being
started.
(4) When communicating from utility while a user program is running
If a communication from utility may affect the user program, lower the task priority of
utility communication than that of the user program.
Page 9-17, Section 9.4.2)
Set the priority of the user program task to 100 or more (100 to 255).
If the priority is set within 0 to 99, the system may not operate properly.
The actual FTP processing (task) of the C Controller module is performed at the
priority of 200.
When accessing via FTP during user program execution, perform programming
as described below.
• Set the priority of the user program task within 201 to 255.
• When setting the priority of the user program task within 100 to 200, insert
wait processing (such as taskDalay) in the user program to enable the actual
FTP processing.
Page 9-51, Section 9.9)
Q12DCCPU-V
Q06CCPU-V
9.6 Precautions for Functions
9
Q06CCPU-V-B
10
11
12
13
A
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