Rockwell Automation T7420A_AF ICS Regent+Plus Analog Input Modules 60Hz Rejection and Fast Response - Manual (Page 6)

Analog Input Modules (T7420A, AF)
6
Industrial Control Services
Application
Analog Input Range Selection
The possible input voltage ranges are the same for both
differential and single-ended modes. Since current
measurements are converted to voltages using external
precision resistors, the same voltage ranges apply. Choices of
input voltage ranges include unipolar, bipolar, and offset
ranges. All ranges are selected by setting jumpers located
inside the module.
Table 1. Analog Input Ranges.
Voltage Ranges Current Ranges
(using external 250 Ohm resistor)
0 to 5 Vdc 0 to 20 mA
1 to 5 Vdc 4 to 20 mA
-5 to +5 Vdc -20 to +20 mA
0 to 10 Vdc 0 to 40 mA
-10 to +10 Vdc -40 to +40 mA
Input Out of Range Detection
If the analog signal is well beyond the normal operating range
selected, the NOSIG contact associated with the analog point
will be enabled. Note that there are some out-of-range signals
that do not set the NOSIG bit. The out of range thresholds for
each input range are shown on page 27.
Absolute Signal Ranges
The absolute working range for any analog input signals is
from -10.3 volts to +10.3 volts with regard to AGND (analog
ground). The acceptable common mode voltage range (either
differential or single-ended with regard to its appropriate
analog reference input) is from -10.3 volts to +10.3 volts.