Chapter 5. Function Block Diagram (FBD)
GFK-2950C February 2018 249
5.7 Counters
Down Counter. Counts down from a preset value. The output is ON whenever the
Current Value is 0.
The parameter that appears above the function block is a one-dimensional, three-
word array in %R, %W, %P, %L, or symbolic memory that the counter uses to store
its current value, preset value and control word.
For details, refer to Counters in Chapter 4.
Up Counter. Counts up to a designated value. The output is ON whenever the
Current Value is the Preset Value.
The parameter that appears above the function block is a one-dimensional, three-
word array in %R, %W, %P, %L, or symbolic memory that the counter uses to store
its current value, preset value and control word.
For details, refer to Counters in Chapter 4.
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