Mitsubishi L02CPU User Manual page 308

(a) Overhead time at execution of interrupt and fixed scan execution type programs
When using an interrupt or fixed scan execution type program, add the overhead time given in the following
table. Two kinds of overhead time (pre-start and program-end) need to be added to interrupt programs.
CPU module
L02CPU
L26CPU-BT
L02CPU
L26CPU-BT
L02CPU
L26CPU-BT
(b) Overhead time when local devices in the interrupt program are enabled
Add the overhead time given in the following table when enabling the use of the local device in the program by
turning on SM777 (Enable/disable local device in interrupt program), add the time given in the following table.
[Pre-start overhead time for interrupt programs]
(N1 × KM1) + ((N2 + (N3/16)) × KM2) + (N4 × KM3) + KM4 [µs]
[Overhead time after interrupt program activation]
(N1 × KM5) + ((N2 + (N3/16)) × KM6) + (N4 × KM) + KM8 [µs]
• N1: F Number of device types that specified a local device
• N2: FNumber of word device points
• N3: FNumber of bit device points
• N4: F Number of index register points that were specified as a local device
CPU module
L02CPU
L26CPU-BT
306
Interrupt from the
built-in I/O
(I0 to I15)
Without high- With high-
speed start speed start
57.0 [µs] 19.0 [µs]
54.0 [µs] 18.0 [µs]
CPU module
CPU module
KM1 KM2
8.0
8.0
Pre-start overhead time for interrupt programs
Fixed scan interrupt
(I28 to I31)
Without high-
speed start
51.0 [µs]
46.0 [µs]
Program-end overhead time for interrupt programs
Without high-speed start
28.0 [µs]
26.0 [µs]
Overhead time for fixed scan execution type programs
Without high-speed start
77.0 [µs]
72.0 [µs]
KM3 KM4
0.22 0.65 90.0
0.10 0.68 80.0
Interrupt from the intelligent
function module
(I50 to I127)
With high- Without high-
speed start speed start
17.0 [µs] 66.0 [µs]
16.0 [µs] 61.0 [µs]
With high-speed start
9.0 [µs]
8.5 [µs]
With high-speed start
25.0 [µs]
23.0 [µs]
KM5 KM6
8.0 0.22
8.0 0.10
With high-
speed start
31.0 [µs]
26.0 [µs]
KM7 KM8
0.65 30.0
0.68 20.0