Mitsubishi L02CPU User Manual page 307

The CPU module measures current, minimum, and maximum values of the scan time. The scan time can be checked
by monitoring SD520, SD521, and SD524 to SD527, as the scan time is stored in the special register. (Accuracy:
±0.1ms)
Current value
Minimum value
Maximum value
When the stored values in SD520 and SD521 are 3 and 400 respectively, the scan time is 3.4ms.
Ex. Ex.
(1) I/O refresh time
Use the following expression to calculate the I/O refresh time. Note that the I/O refresh time for the built-in special
functions is excluded.
[I/O refresh time]
(Number of input refresh points
*1 The number of input refresh points is the value obtained by dividing the number of input points by 16/h.
*2 The number of output refresh points is the value obtained by dividing the number of output points by 16/h.
CPU module
L02CPU
L26CPU-BT
(2) Processing time for the instruction (DUTY instruction) in END processing
Using the DUTY instruction increases the END processing time because the user timing clock (SM420 to SM424
and SM430 to SM434) specified with the instruction is turned on or off in END processing.
CPU module
L02CPU
L26CPU-BT
(3) Instruction execution time
The instruction execution time is a total of the time required for all instructions used in the program to be executed
and (a) and (B) described in the following page. For execution time of instructions, refer to the following.
MELSEC-Q/L Programming Manual (Common Instruction)
SD520 SD521
SD524 SD525
SD526 SD527
Stores the scan time of 1ms or less. (unit:
Stores the scan time. (in increments of 1ms)
*1
× KM1) + (number of output refresh points
When set to 1
*2
× KM2) [µs]
KM1
1.5
1.5
Processing time in END processing
6.9 [µs]
5.7 [µs]
APPENDICES
s)
KM2
1.0
1.0
When set to 5
7.4 [µs]
6.1 [µs]
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APPEN
DIX