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• If both the UDF and OVF LEDs of the same channel are lit, the channel is uncalibrated.
The AI module can be diagnosed and monitored using the STS Hardware Test utility. The
Hardware Test verifies that the module is operational, presents the module configuration and
shows the actual value of each input, including overflow and underflow. It is also possible to
change the input filter setup for the duration of the Hardware test.
In the HW Test utility, it is possible to set the AI module to Freeze Mode. In this mode the
program user will get the KLV or PDV of each input in the module instead of the actual input
value. Freeze mode enables testing the inputs while the user application program is running.
AI Module Value Representation
In ± 20 mA
current inputs
In 4 - 20 mA
current inputs
In ± 5 V current
inputs
Decimal Value
Input Current
< -32256
< -20.16 mA
-32000
0
32000
> 32256
> +20.16 mA
Decimal Value
Input Current
< 6144
< 3.84 mA
6400
0
32000
> 32256
> +20.16 mA
Decimal Value
Input Voltage
< -32256
-32000
0
32000
> 32256
12-5
Indication
Underflow LED ON
-20 mA
Rated range (no LED
0 mA
active)
+20 mA
Overflow LED ON
Indication
Underflow LED ON
+4 mA
Rated range (no LED
0 mA
active)
+20 mA
Overflow LED ON
Indication
<-5.04V
Underflow LED ON
-5 V
Rated range (no LED
0 V
active)
+5 V
> +5.04 V
Overflow LED ON
Analog Input Module
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