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Analog I/O Units Section 7-4
Analog I/O Signal
Ranges
Analog I/O data is digitally converted according to the analog I/O signal range
as shown below.
Note When the input exceeds the specified range, the AD converted data will be
fixed at either the lower limit or upper limit.
Item Voltage I/O Current I/O
Analog
Input
Section
Number of inputs 2 inputs (2 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 (Settable for individual inputs via DIP switch)
Open-circuit detection function Supported
Analog
Output
Section
Number of outputs 1 output (1 word allocated)
Output signal range 1 to 5 VDC, 0 to 10 VDC, or
−10 to 10 VDC,
0 to 20 mA or 4 to 20 mA
Allowable external output load resistance 1 kΩ min. 600 Ω max.
External output impedance 0.5 Ω max.
Resolution 1/6000 (full scale)
Overall accuracy y 25°C 0.4% full scale
0 to 55°C 0.8% full scale
Set data (D/A conversion) 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
Conversion time 2 ms/point (6 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: 83 mA max., 24 VDC: 110 mA max.
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