9
DEDICATED INSTRUCTIONS
9.2 Precautions for Dedicated Instructions
9.2.1 Precautions for Dedicated Instructions (Common)
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9.2
Precautions for Dedicated Instructions
9.2.1
Precautions for Dedicated Instructions (Common)
The following explains precautions for using dedicated instructions.
(1) Change of the data specified with dedicated instructions
Do not change any data (control data, etc.) until execution of the dedicated instruction
is completed.
(2) When a dedicated instruction has not been completed
Dedicated instructions must be executed in online mode.
Execution of the dedicated instructions is not allowed in offline mode.
(3) Accessing another station with a dedicated instruction during CC IE
Control Network Diagnostics
Execution of the dedicated instruction may not start for a while.
Execute the dedicated instruction by either of the following methods after processing
of the CC IE Control Network Diagnostics.
(a) Using the COM instruction
Execute the dedicated instruction after executing the COM instruction for
communication with the peripheral (GX Developer).
For safety CPUs, however, the following methods are not available.
1) Store 0 in the Refresh processing selection for COM instruction execution
(SD778).
2) Turn ON the Link refresh processing selection for COM instruction execution
(SM775).
3) Execution of the COM instruction activates communication with GX Developer.
4) Access another station with a dedicated instruction.
(b) Using the Time reserved for communication processing (SD315) (For Basic model
QCPUs, High Performance model QCPUs, Process CPUs, and Redundant
CPUs)
Using the Time reserved for communication processing (SD315), secure a time of
2ms to 3ms for communication processing.
Figure 9.1 Accessing another station with a dedicated instruction during CC IE Control Network Diagnostics
MOV
H0
SD778
SM402
Dedicated instruction
COM
SET SM775
Start contact
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