B-48
6 Changing Input Characteristics
6.1 Procedure for Changing Input Characteristics
FX
3U
/FX
3UC
Series PLC User's Manual - Analog Control Edition
FX3UC-4AD (4-channel Analog Input)
6. Changing Input Characteristics
For 4AD, the standard input characteristics are provided for each input mode (BFM #0) at the time of factory
shipment.
Changing the offset data (BFM #41 to #44) or the gain data (BFM #51 to #54), however, can change the input
characteristics of each channel. This chapter describes how to change the input characteristics.
6.1 Procedure for Changing Input Characteristics
1 Determine the input mode (BFM #0)
Determine the input mode (BFM #0) optimum for the selected channels and the voltage/current
specifications.
Example: Enter "HFF00" in BFM #0 to set input mode 0 for channels 1 and 2 and prevent use channels 3 and
4.
Caution regarding data setting:
• If a value "2", "5", "8" or "F" is set for a channel, the input characteristics of the channel cannot be changed.
• Set the optimum input mode for the analog signal to be input.
2 Determine the input characteristics to be changed.
Determine the digital value to be output according to the input voltage/current.
Set value
(HEX)
Input mode
Analog input
range
Digital output
range
Resolution
0 Voltage input mode -10V to +10V -32000 to +32000 0.32mV
1 Voltage input mode -10V to +10V -4000 to +4000 2.50mV
2
Voltage input analog value direct indication
mode
The offset and the gain cannot be adjusted.
3 Current input mode 4mA to 20mA 0 to 16000 1.25µA
4 Current input mode 4mA to 20mA 0 to 4000 5.00µA
5
Current input analog value direct indication
mode
The offset and the gain cannot be adjusted.
6 Current input mode -20mA to +20mA -16000 to +16000 1.25µA
7 Current input mode -20mA to +20mA -4000 to +4000 5.00µA
8
Current input analog value direct indication
mode
The offset and the gain cannot be adjusted.
9 to E Not used. - - -
F No channels used - - -
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