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Analog Input Units Section 7-2
Analog Input Signal
Ranges
Analog input data is digitally converted according to the input signal range as
shown below.
Note When the input exceeds the specified range, the A/D conversion data will be
fixed at either the lower limit or upper limit.
Item Voltage Input Current Input
Number of inputs 4 inputs (4 words allocated)
Input signal range 0 to 5 VDC, 1 to 5 VDC,
0 to 10 VDC, or –10 to 10 VDC
0 to 20 mA or 4 to 20 mA
Max. rated input ±15 V ±30 mA
External input impedance 1 MΩ min. Approx. 250 Ω
Resolution 1/6000 (full scale)
Overall accuracy 25°C 0.3% full scale 0.4% full scale
0 to 55°C 0.6% full scale 0.8% full scale
A/D conversion data 16-bit binary (4-digit hexadecimal)
Full scale for –10 to 10 V: F448 to 0BB8 Hex
Full scale for other ranges: 0000 to 1770 Hex
Averaging function Supported (Set in output words n+1 and n+2.)
Open-circuit detection function Supported
Conversion time 2 ms/point (8 ms/all points)
Isolation method Photocoupler isolation between analog I/O terminals and internal circuits. No isolation
between analog I/O signals.
Current consumption 5 VDC: 100 mA max.; 24 VDC: 90 mA max.
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