Mitsubishi Electric MELSEC iQ-R Series User Manual page 108

■Delay limit value behind a cycle
This value indicates the allowable period of time for a delay (a time lag) behind a cycle and a waiting program is executed if an
interrupt is enabled within the period. If an interrupt is enabled outside the period, the program is not executed.
"MAIN"
(Fixed scan execution type program)
Cycle interval of MAIN
The delay limit value behind a cycle differs as follows.
• For the fixed scan execution type program
The value is the greatest common divisor of the fixed scan intervals of all the fixed scan execution type programs. For
example, if there are fixed scan execution type programs with 2ms, 4ms, and 12ms scan periods, the delay limit value behind
a cycle is 2ms.
• For fixed scan interrupts (I28 to I31, I48, I49) using the internal timer of the CPU module
The value is fixed to the same value as the fixed scan interval. For example, if the periods are I28: 100ms and I29: 20ms, the
delay limit value behind a cycle is 100ms for I28, and 20ms for I29.
8 RUNNING A PROGRAM
106
8.5 Program Execution Type
Delay limit value
behind the cycle
Delay behind the cycle
Section where Section where
interrupts interrupts
are disabled are disabled