Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 583)

I/O Interface
Section 10A
10A-60
To determine an approximate voltage that an input value represents, use
one of the following equations:
10 V
32,768
(input value) = input voltage (V)
or for current
20 mA
16,384
( input value) = input voltage (V)
For example, if an input value of --16,021 is in the input
image, the calculated input voltage is:
10 V
32,768
(--16,021) = --4.889221 V
This is the calculated value. The
actual value may vary within the
accuracy limitations of the module.
Table 10A.AO
Analog Output Decimal Values (from PAL)
Voltage/Current Range Decimal Representation Number of Significant Bits Resolution per LSB
-- 10V to + 10V (1 LSB) --32,768 to + 32,767 14 bits
1.22070mV
0V to 10 V (1 LSB) 0 to 32,767 13 bits
1.22070mV
0V to 5V 0 to 16,384 12 bits
1V to 5V 3,277 to 16,384 11.67 bits
0 to +21mA 0 to +32,764 13 bits
2.56348mA
0 to +20mA 0 to 31,208 12.92 bits
2.56348mA
4 to +20 mA 6,242 to 31,208 12.6 bits
To determine a value for the PAL variable of an analog output to produce a
desired output, use one of the following equations:
32,768
10 V dc
(desired voltage output V) = output decimal value
or for current
32,768
21 mA
( desired current output mA) = output decimal value
For example, if an output voltage of +1 V dc is desired, the
value to be put in the corresponding PAL variable would be:
32,768
10V dc
(+1V dc) = 3277