2 ANALOG INPUT MODULE REPLACEMENT
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2.7.1 Performance comparison
2.7 A68ADN (Upgrade to Q68ADV, Q68ADI)
Item A68ADN
Analog input
Voltage -10 to 0 to +10VDC (Input resistance value: 1M)
Current -20 to 0 to +20mADC (Input resistance value: 250)
Digital output
16-bit signed binary
When 1/4000 is set: -4096 to +4095
When 1/8000 is set: -8192 to +8191
When 1/12000 is set: -12288 to +12287
I/O characteristics
(Factory-set: gain...5V, offset...0V)
Maximum resolution
Overall accuracy
(Accuracy in respect to
maximum digital output value)
Analog input
Digital output value
(When gain 5V/20mA, offset 0V/0mA)
1/4000 1/8000 1/12000
+10V +4000 +8000 +12000
+5V or +20mA +2000 +4000 +6000
0V or 20mA 0 0 0
-5V or -20mA -2000 -4000 -6000
-10V -4000 -8000 -12000
1/4000 1/8000 1/12000
Voltage input 2.5mV 1.25mV 0.83mV
Current input 10µA 5µA 3.33µA
1/4000 1/8000 1/12000
±1% ±40 ±80 ±120