22 Analog I/O Modules (AD268 / DA264 / TC218)
5. I/O Allocation and Programming PART 1 AD268

1 to 5V / 4 to 20mA range:

Input voltage/current A/D conv ersion data
1 to 5 V 4 to 20 mA Hexadecim al Integer Resolution
Upper limit +5.1196 V +20.479 mA H337F 13183
:: : :
Full scale (positive) +5 V +20 mA H3200 12800
:: : :
+1.0003125 V +4.00125 m A H 0001 1
Lower limit 1 V 4 mA H0000 0
0.3125 mV / bit
1.25 µA / bit

4 to 20mA range:

D = 800 × A - 3200

D: Digital data
A: Analog signal (mA)

1 to 5V range:

D = 3200 × A - 3200

D: Digital data
A: Analog signal (V)
0Analog input value
+5.1196V
20.479mA
Digital value
+10.2V-10.2V
Upper limit
Lower limit
+5V
20mA
H3200
12800
H337F
13183
1V
4mA
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