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APPENDICES
APPEN
DIX
Appendix 2 CPU Module Processing Time
Appendix 2.2 Factors that Increase the Scan Time
Appendix 2.2 Factors that Increase the Scan Time
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]
(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
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 KM1 KM2
L02CPU 170.0 1.0
L26CPU-BT 1100.0 15.0
CPU module KM1 KM2 KM3 KM4 KM5
L02CPU 8.0 0.22 0.65 58.0 14.2
L26CPU-BT 8.0 0.10 0.68 35.5 17.3
CPU module KM1 KM2 KM3 KM4
L02CPU 16.0 0.44 1.30 80.0
L26CPU-BT 16.0 0.20 1.36 100.0
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