Function Applications
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Figure 4-13 Curve 4 and curve 5
Selecting AI Curve for AI Terminal
The AI curves for AI1 and AI2 are defined by the ones and tens of F4-48. You can select any one among
the five types of curves for each of the two AI terminals.
Longer AI input filter time indicates stronger anti-interference capability but slower adjustment
response. Shorter filter time indicates faster adjustment response but weaker anti-interference
capability. If the analog input is liable to interference, increase the filter time to stabilize the detected
analog input. However, increasing the AI filter time will slow the response to analog detection.
Therefore, the filter time must be set properly based on actual conditions.
Selecting AI Terminal as Frequency Reference Source
The power supply unit and I/O extension cards 1 and 2 each provide two AI terminals, which offer –10 V
to +10 V voltage inputs or 0 mA to 20 mA current inputs. The following describes how to set the AI
terminal as the main frequency reference source.
In this example, AI1 of the power supply unit is selected as the AI1 hardware source (F4–25 = 1), and
curve 1 is selected (the ones of F4-48 is set to 1) for AI1. When the voltage-type AI1 terminal is used as
the frequency source, 2 V to 10 V voltage corresponds to 10 Hz to 40 Hz frequency. The following figure
shows how to set the parameters.
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