Appendix i: convert voltage to dac – B&B Electronics ZZ24D-NA(NB,NC,ND)-SR - Manual User Manual
Page 96
Appendix I: Convert Voltage to DAC
90
Manual Documentation Number: pn7515_ZlinxIO-0712m
A
A
p
p
p
p
e
e
n
n
d
d
i
i
x
x
I
I
:
:
C
C
o
o
n
n
v
v
e
e
r
r
t
t
V
V
o
o
l
l
t
t
a
a
g
g
e
e
t
t
o
o
D
D
A
A
C
C
1. Going from Voltage to Modbus Holding Register value:
Voltage Full Range = 10VDC
DAC full range is 4096 counts, 4096
Voltage Desired * 4096/10 = Holding Register Value to Send
2. Going from Current to Modbus Holding Register value:
Current Full Range = 20mA
DAC full range is 4096 counts, 4096
Current Desired * 4096/20 = Holding Register Value to Send
3. Going from Modbus Input Register to Voltage value:
Voltage Full Range = 10VDC
DAC full range is 4096 counts, 4096
Input Register * 10/4096 = Voltage Value
4. Going from Modbus Input Register to Current value:
Current Full Range = 20mA
DAC full range is 4096 counts, 4096
Input Register * 20/4096 = Voltage Value