Chapter 5 Program Configuration and Operation Method
5- 4
(2) Example
The scan time of a system consisting of main unit (program 4kstep) + five 32-point I/O modules + one analog
module + one communication modules (200 byte 1 block)
Scan time(㎲) = ladder execution time + system processing time + digital module I/O processing time +
analog I/O processing time + communication module processing time + XG5000 Service processing time
= (2047 x (0.67(LOAD)+ 0.80(OUT)) + (500) + (300 x 5) + (3000 x 1) + (800 x 1) + (100) ㎲
= 3009 + 500 + 1500 + 3000 + 800 + 100 ㎲ = 8909 ㎲
= 8.9 ㎳
(But, in case of online editing or writing XG-PD parameter, scan time increases temporary up to 100ms)
(3) Scan time monitor
(a) Scan time can be monitored 『Online』-『PLC Information』-『Performance』.
(b) Scan time is save in special relay (F) area as follows.
F0050: max. value of scan time (unit: 0.1 ms)
F0051: min. value of scan time (unit: 0.1 ms)
F0052: current value of scan time (unit: 0.1 ms)
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