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4 Analog Input
4.1 Analog Input Procedures
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4AD/FX3UC-4AD (4-channel Analog Input)
4. Analog Input
This chapter describes the minimum programming necessary to readout the 4AD analog data.
Follow the procedure below to confirm that the analog data can be properly read out.
4.1 Analog Input Procedures
1 Unit number check
Unit numbers from 0 to 7 will be assigned to the special function units/blocks starting from the left.
When units/blocks are connected to the FX
3UC-32MT-LT(-2) PLC, unit numbers from 1 to 7 are
assigned. Check the unit number assigned to the 4AD.
2 Input mode (BFM #0) setting
Depending on the analog signal generator to be connected, set the input mode (BFM #0) for each
channel.
Use hexadecimal numbers for input mode setting. Set the corresponding channel digit to the input
mode setting value specified in the following table:
→ For a detailed description of the standard input characteristics, refer to Section 2.4.
→ For a detailed description of the input mode (BFM #0), refer to Subsection 5.4.1.
Setting
value
Input mode
Analog input
range
Digital output range
0 Voltage input mode -10V to +10V -32000 to +32000
1 Voltage input mode -10V to +10V -4000 to +4000
2
Voltage input
Analog value direct indication mode
-10V to +10V -10000 to +10000
3 Current input mode 4mA to 20mA 0 to 16000
4 Current input mode 4mA to 20mA 0 to 4000
5
Current input mode
Analog value direct indication mode
4mA to 20mA 4000 to 20000
6 Current input mode -20mA to +20mA -16000 to +16000
7 Current input mode -20mA to +20mA -4000 to +4000
8
Current input mode
Analog value direct indication mode
-20mA to +20mA -20000 to +20000
F Channel not used
Main unit
(FX
3U
Series
PLC)
Input/output
extension
block
Special
function block
Special
function block
Input/output
extension
block
Special
function unit
Unit
number: 0
Unit
number: 1
Unit
number: 2
H
ch4
ch3
ch2
ch1