Appendix 9 Processing Time - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

Appendix 9
The scan time of the CPU module is the sum of the instruction execution time, the program execution time, and the END
processing time. Each of the processing time that constitutes the scan time is as follows.
For the availability of functions depending on the CPU module, refer to the description of each function.
Instruction execution time
The instruction execution time is the total of each instruction processing time used for the program executed by the CPU
module. For the processing time of each instruction, refer to the following.
 MELSEC iQ-R Programming Manual (CPU Module Instructions, Standard Functions/Function Blocks)
 MELSEC iQ-R Programming Manual (Process Control Function Blocks/Instructions)
Program execution time
The program execution time is the processing time when multiple programs are executed. When the interrupt program is
executed, the overhead time during the interrupt program being executed is also included.
Processing time when multiple programs are executed (program switching time)
When multiple programs are executed, the scan time becomes longer.
■When multiple programs run
The processing time [s] with multiple programs run is given by: the number of program files  1.2.
Overhead time at execution of interrupt/fixed scan execution type program
This section describes each overhead time when each of the interrupt programs and fixed scan execution type programs is
executed.
The processing time for the interrupt program and fixed scan execution type program is as shown below.
Instruction processing time for each instruction + Overhead time + Each refresh processing time (when
setting)
APPX
898

Appendix 9 Processing Time

Processing Time