maxPAC Hardware Reference Guide
Metso Automation MAX Controls Inc. • 277596 •
3-4
A/D
Voltage Input Module
Diagnostics
The module executes diagnostics on power up. When an error is detected on
power-up or during online operation, the front-panel green LED, labeled
Active, blinks the first digit at a slower rate and the second digit at a faster
rate. During normal operation the active LED is on continuously or flashes at
a steady one-second rate when the module is not being scanned. The
diagnostic codes are as follows:
Error Condition Code
A/D send fault 0x12
A/D receive fault 0x13
A/D self calibration failure 0x14
Bad A/D communication 0x15
A/D does not complete conversion 0x16
RAM Test Failure (power-on) 0x22
CPU Stack Error (power-on) 0x23
CPU Error (power-on) 0x24
Checksum Error (power-on) 0x25
Interrupt Error (power-on) 0x26
FPGA Download Error (power –on) 0x32
Module Specifications
Resolution 15 bits plus sign
Scan Rate 20 msec.
Temperature Sensitivity ±0.004% of reading/
o
C ±1.5uv/
o
C RTI
Accuracy ±0.1% of reading at 25
o
C
Source Impedance Effect 10 Mohm operational, 20K Ohms on loss of power
Conversion method Sigma Delta oversampling. Single A/D per channel
Span 4 to 20 mA, 1-2.4V.
Calibration Self-calibration on power up. Periodically on line to
compensate for temperature effects
Input Impedance IOP302, 300 Ohms; IOP305, 1mOhm
Normal Mode Voltage IOP302, 50 Volts; IOP305, 24 Volts
Normal Mode Rejection 60db @ 50/60 Hz
Input Power
(from 24V system supply)
125 mA
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