Appendix 2.2 Factors That Increase The Scan Time - Mitsubishi L02CPU User Manual

Appendix 2.2
When any of the function or operation described below is executed, the scan time is increased by the amount of its
processing time.
(1) Batch transfer to the program memory
Use the following expression to calculate the increased scan time when data are batch transferred to the program
memory.
[Time required for batch-transferring data to the program memory]
Scan time × KM1 + KM2 [s]
CPU module
L02CPU
L26CPU-BT
(2) Use of local devices
Use the following expression to calculate the increased scan time when local devices are used.
[Increase in the scan time]
((N1 × KM1) + ((N2 + N3/16)) × KM2) + (N4 × KM3) + KM4) × n + KM5 [µs]
• N1: Number of device types that specified a local device
• N2: Number of word device points
• N3: Number of bit device points
• N4: Number of index register points that were specified as a local device
• n: Number of programs where local devices are set to be used
CPU module
L02CPU
L26CPU-BT
Use the following expression to calculate the increase in scan time when local devices are used in a subroutine
program (only when the subroutine program is called from another file).
[Increase in the scan time]
(N1 × KM1) + ((N2 + (N3/16)) × KM2) + (N4 × KM3) + KM4 [µs]
• N1: Number of device types that specified a local device
• N2: Number of word device points
• N3: Number of bit device points
• N4: Number of index register points that were specified as a local device
• n: Number of programs where local devices are set to be used
CPU module
L02CPU
L26CPU-BT
Factors that Increase the Scan Time
KM1 KM2
8.0 0.22
8.0 0.10
KM1
16.0
16.0
KM1
170.0
1100.0
KM3
0.65
0.68
KM2 KM3
0.44 1.30
0.20 1.36
APPENDICES
KM2
1.0
15.0
KM4 KM5
58.0 14.2
35.5 17.3
KM4
80.0
100.0
309
APPEN
DIX