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E-52
6 Table Output Function
6.6 Examples uses of table output function
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4DA (4-channel Analog Output)
6.6 Examples uses of table output function
[Uses of table output function]
• Inverter frequency setting, servo speed control, etc.
1. Inverter frequency setting
The output frequency can be controlled by inputting analog signals (e.g. voltage from 0 to 10 V and current
from 4 to 20 mA) to inverter frequency setting signals.
The analog signals and output signals have the following proportional relationship.
To control the frequency as shown below, where control the analog signal is proportional to the frequency use
the table output function.
Example of table output
10V5
60
30
Output
frequency
(Hz)
0
Analog signal
Time
60
30
0
Output
frequency
(Hz)
Time
10
5
0
Output update
time at point 1
Point 1
Output update
time at point 2
Output update
time at point 3
Point 2 Point 3
Point 4
S-shaped
interpolation
No interpolation
Output
voltage (V)
S-shaped
interpolation