I/O Modules
3-4 ADAM 4000 Series User's Manual
Function Description for the ADAM-4011 analog input module
To provide a better understanding of the functioning of the ADAM
modules, the following is a description of the module with the most exten-
sive set of functions, the ADAM-4011.
All analog input data first flows through the PGA (programmable gain
amplifier). The amplifier can vary its gain from 1 to 128. The PGA automati-
cally adjusts the signal to a range of -2.5 V to +2.5 V. This ensures optimal
input voltage and resolution for the A/D converter.
The A/D conversion is supervised by the microprocessor that holds the
calibration software. Two kinds of calibration take place automatically on
startup or reset: Auto Zero calibration and Auto Span calibration. Normal
calibration is used to adjust the signal according to calibration parameters
defined by the user.
The digital 10 Hz filter provides a steady state output by using the DΣ
function.
Before the data enters the microprocessor it passes through an optical
isolation device. The opto isolation prevents ground loops and limits the
chance of damage from power surges.
The microprocessor has six basic functions:
- Linearization of T/C (Thermocouple)
- Communication software and command set
- Calibration software
- Alarm monitoring
- Event counting
- Management of the EEPROM device that holds the system parameters
- Data transformation
After data has been transformed to the right data format its is passed on the
RS-485 output port.
If an input value exceeds the High alarm setting or falls below the Low alarm
setting, a flag is set in one of the Digital Output channels.
Finally, the on-board switching regulator accepts voltage between +10 and
+30 V
DC
. This power circuit has an isolation value of 500 V
DC
to protect your
equipment from damage from power surges.
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