Specifications

Analog Input Modules
182
31007715 6/2008
STB ACI 1400 Functional Description
Functional
Characteristics
The STB ACI 1400 module is an eight-channel module that handles analog input
data from eight field sensors operating in a 4 to 20 mA (default) or 0 to 20 mA
current range. The following operating parameters are user configurable:
z offset
z maximum count
z averaging
z range
z channel operation (enable/disable)
Using the RTP feature in your NIM, you can access the value of the following
parameters:
z offset
z maximum count
z averaging
Refer to the Advanced Configuration chapter in your NIM manual for general
information on RTP.
Offset and
Maximum Count
You may apply an offset value to the low end of the operating current range and a
maximum count to the high end of the operating current range. This feature allows
you to calibrate the analog input channels to match your equipment.
Offset is configured as a signed integer. It may be a decimal or hexadecimal value
in the range -767 to +767 (0xFD01 to 0x2FF), representing a current offset of:
z +/−0.38 mA for the 4 to 20 mA operating range
z +/−0.48mA for the 0 to 20 mA operating range
By default, the offset on both channels is 0.
Maximum count is configured as a decimal or hexadecimal value in the range
31 233 to 32 767, representing a current offset of:
z +/−0.38 mA for the 4 to 20 mA operating range
z +/−0.48mA for the 0 to 20 mA operating range
By default, the maximum count on both channels is 32 000 (0x7D00).
Offset and maximum count may be applied on each channel independently.
Note: Standard NIMs with firmware version 2.0 or higher support RTP. RTP is not
available in basic NIMs.
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