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CONFIGURATION Menu
SR2MAN01 11/2007 63
WATCHDOG CYCLE Menu
Description The duration of a program cycle depends on its length and complexity: In particular,
the type and number of inputs-outputs and the number of extensions.
The program is executed periodically at regular time intervals. This time interval is
called the cycle time.
The program will only execute completely if the cycle time is greater than the
program execution time.
The cycle period is configurable in the : CONFIGURATION → CYCLE
WATCHDOG menu. This period may be set from 6 to 90 milliseconds in 2-
millisecond steps.
The default value of the cycle period is 10 milliseconds.
Illustration:
If the duration of the execution cycle of the program and the embedded software
functions exceeds the cycle time value selected by the programmer, the
WATCHDOG can be used to operate a specific action.
Note: Make sure that:
z Input variations that are too rapid are not masked by cycle time that is too slow,
z The speed of output variations is compatibles with system commands.
Note: In certain dialog phases, the cycle times are increased by the
communication times between the PC and the smart relay. No guarantee can be
made concerning the real cycle times during this operating mode. The
WATCHDOG is always inhibited in this smart relay operating mode.
Note: To return to the main menu from the CONFIGURATION menu, use the
navigation key .
2
Menu / OK
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C Y C L E = 0 5 x 0 2 m S
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