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(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.
(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
Pre-start overhead time for interrupt programs
Interrupt from the
built-in I/O
(I0 to I15)
Fixed scan interrupt
(I28 to I31)
Interrupt from the intelligent
function module
(I50 to I127)
Without high-
speed start
With high-
speed start
Without high-
speed start
With high-
speed start
Without high-
speed start
With high-
speed start
L02CPU 57.0 [µs] 19.0 [µs] 51.0 [µs] 17.0 [µs] 66.0 [µs] 31.0 [µs]
L26CPU-BT 54.0 [µs] 18.0 [µs] 46.0 [µs] 16.0 [µs] 61.0 [µs] 26.0 [µs]
CPU module
Program-end overhead time for interrupt programs
Without high-speed start With high-speed start
L02CPU 28.0 [µs] 9.0 [µs]
L26CPU-BT 26.0 [µs] 8.5 [µs]
CPU module
Overhead time for fixed scan execution type programs
Without high-speed start With high-speed start
L02CPU 77.0 [µs] 25.0 [µs]
L26CPU-BT 72.0 [µs] 23.0 [µs]
CPU module KM1 KM2 KM3 KM4 KM5 KM6 KM7 KM8
L02CPU 8.0 0.22 0.65 90.0 8.0 0.22 0.65 30.0
L26CPU-BT 8.0 0.10 0.68 80.0 8.0 0.10 0.68 20.0
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