Chapter 2 Specifications and System Configuration
2-34
2.4 Analog Input/Output Module Specifications
2.4.1 General Specifications
AS04AD-A / AS08AD-B / AS08AD-C
Electrical specifications
4 8 8
Analog-to-Digital
Voltage input/Current input
Voltage input Current input
24 VDC (20.4 VDC–28.8 VDC) (-15% to +20%)
Isolation
An analog circuit is isolated from a digital circuit by a digital integrated circuit/
optocoupler, but the analog channels are not isolated from one another.
Isolation between a digital circuit and a ground: 500 VDC
Isolation between an analog circuit and a ground: 500 VDC
Isolation between an analog circuit and a digital circuit: 500 VDC
Isolation between the 24 VDC and a ground: 500 VDC
Functional specifications
Analog-to-Digital
Voltage Input
Rated Conversion
Range
K-32000
~
K32000
K0
~
K32000
K-32000
~
K32000
K0
~
K32000
K0
~
K32000
Hardware Input
Limit*
1
-10.12V
~
-0.12V
~
-5.06V
~
-0.06V
~
0.95V
~
Conversion Limit*
2
K-32384
~
K-384
~
K-32384
~
K-384
~
K-384
~
Room Temperature: ±0.2% ; Full Temperature Range: ±0.5%
Hardware
16 bits
2MΩ
Absolute Input
3
±15 V
*1: If the input signal exceeds the hardware input limit, the module only shows the maximum value. If the
input signal is below the lower limit, it only shows the minimum value.
*2: If the input signal exceeds the hardware input limit, it also exceeds the conversion limit and a
conversion limit error appears. For example in the voltage input mode (-10 V to +10 V), when the input
signal is 10.15 V, exceeding the hardware upper limit, it also exceeds the conversion upper limit. The
module uses the upper limit value (32387) as the input signal and a conversion limit error appears.
*3: If an input signal exceeds the absolute range, it might damage the channel.
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