User`s guide

Blocks That Depend on Absolute Time
2-21
Blocks That Depend on Absolute Time
Some Simulink blocks use the value of absolute time (i.e., the time from the
beginning of the program to the present time) to calculate their outputs. If you
are designing a program that is intended to run essentially forever, then you
cannot use blocks that have a dependency on absolute time.
Theproblemariseswhenthevalueoftimereachesthelargestvaluethatcan
be represented by a double precision number. At that point, time is no longer
incremented and the output of the block is no longer correct.
The tables below list all the Simulink blocks that depend on absolute time.
Continuous Blocks
Derivative Variable Transport Delay
Transport Delay
Discrete Blocks
Discrete-Time Integrator — when in triggered subsystems
Nonlinear Blocks
Rate Limiter
Sinks
Scope To Workspace — only if logging in
structure with time format
To File