Eaton ELCM Series, Руководство по эксплуатации

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3. AIAO Units
MN05003006E F or more information visit:
w w w. e a t o n . c o m
1-87
„
Adjusting A/D Conversion Curve in Voltage Input Mode 0 & Mode2
1. Description
y
CH1 example, when CR#2 is set to voltage input mode (mode 0), the Offset value
will be set to 0V (0) and the Gain value to 5V (5V/0.3215mV=16,000), i.e. input
voltage -10V ~ +10V will correspond to values -32,000 ~ +32,000.
y
When CR#2 is set to voltage input mode (mode 2), the Offset value will be set to 0V
(0) and the Gain value to 5V (5V/0.3215mV=16,000), i.e. input voltage 0V ~ +10V will
correspond to values 0 ~ +32,000.
y
If for any reason the default voltage input modes (mode 0 or mode 2), cannot be
used, make adjustments to the A/D conversion curve according to the application
requirements. For example, set the Offset of CH1 to 2V (2V/0.3215mV=6,400) and
the Gain to 6V (6V/0.3215mV=19,200).
( )
Offset Gain
Offset
V
V X
Y
−
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
− × ×
=
32000
) ( 10
) (
16000
Example: If X=6V, Y=?
( )
16000
6400 19200
6400 32000
) ( 10
) ( 6
16000
=
−
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
− × ×
=
V
V
Y
y
The A/D conversion curve needs to be set up only one time. Then set CR#40 to
prohibit further changes.
2. Addresses
y
X0 = On: Set the input mode of the signals in CH1 to mode 0.
y
X1 = On: Set Offset value of CH1 to 2V (6,400) and the Gain value to 6V (19,200).
y
M0 = On: Prohibit changes to the configuration for CH1.
3. Program description
y
When X0 = On, set CR#2 to K0 (H’0000) - mode 0 (voltage input mode).
y
When X1 = On, write K6,400 (Offset value for CH1) into CR#28 and K19,200 (Gain
value for CH1) into CR#34.
y
When X1 goes from On to Off, set M0 = On to disable modifying the A/D conversion
curve. Write K1 (H’1) into CR#40 b0=1 to disable CH1 configuration changes.