Chapter 5. Function Block Diagram (FBD)
GFK-2950C February 2018 267
5.11.2 Standard Timer Function Blocks
These functions blocks use Structure Variable instance data. Each invocation of a timer has
associated instance data that persists from one execution of the timer to the next. Instance
variables are automatically located in symbolic memory. (You cannot specify an address.) You can
specify a stored value for each element. The user logic cannot modify the values.
Timer Off Delay. When the input IN transitions from ON to OFF, the timer starts
timing until a specified period of time has elapsed, then sets the output Q to OFF.
For details, refer to Timers in Chapter 4.
Timer On Delay. When the input IN transitions from OFF to ON, the timer starts
timing until a specified period of time has elapsed, then sets the output Q to ON.
For details, refer to Timers in Chapter 4.
Timer Pulse. When the input IN transitions from OFF to ON, the timer sets the
output Q to ON for a specified time interval.
For details, refer to Timers in Chapter 4.
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