Factors That Increase The Scan Time; Appendix 3.2 - Mitsubishi Electric L02SCPU User's Manual And Reference

Appendix 3.2

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]
L02SCPU, L02SCPU-P
L02CPU, L02CPU-P
L06CPU, L06CPU-P
L26CPU, L26CPU-P, L26CPU-BT, L26CPU-PBT
(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 [s]
• N1: Number of devices that is specified as 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
L02SCPU, L02SCPU-P
L02CPU, L02CPU-P
L06CPU, L06CPU-P
L26CPU, L26CPU-P, L26CPU-BT, L26CPU-PBT
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 [s]
• N1: Number of devices that is specified as 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
L02SCPU, L02SCPU-P
L02CPU, L02CPU-P
L06CPU, L06CPU-P
L26CPU, L26CPU-P, L26CPU-BT, L26CPU-PBT

Factors that increase the scan time

CPU module
CPU module
CPU module
KM1
120.0
170.0
260.0
1100.0
KM1 KM2 KM3
16.0 0.23 1.49
8.0 0.22 0.65
8.0 0.10 0.47
8.0 0.10 0.68
KM1 KM2
20.3 0.76
16.0 0.44
16.0 0.20
16.0 0.20
APPX
KM2
1.2
1.0
4.7
15.0
KM4 KM5
98.3 92.0
58.0 14.2
35.5 12.7
35.5 17.3
KM3 KM4
4.47 257
1.30 80.0
0.94 100.0
1.36 100.0
385
A