Eaton ELCM Series, Руководство по эксплуатации

Страница: 121 / 336

E L C O p e r a t i o n M a n u a l
F o r m o r e i nf o r m a t i o n v i sit :
w w w. e a t o n . c o m
MN05003006E 1-14
K4,000 (GAIN value of CH1 ~ CH4) into CR#24 ~ 27.
y
When X1 goes from On to Off, set M0 = On to turn M0 on. When M0 turn on, write
K585 (H’249, i.e. 0000 0010 0100 1001 in binary) into CR#33 to disable modifying
the Gain and Offset values for CH1 ~ CH4.
4. Program example
Ladder Diagram: Explanation:
Set CH1 ~ CH4 as mode 3
(current input mode)
Set the OFFSET value of
CH1 ~ CH4
Set the GAIN value of CH1 ~
CH4
X0
M0
X1
K0 K24 K4
K0 K33 K1
K0 K1 TO P
K0 K4
M0
TO P
TO P
TO P
X1
SET
H6DB
K1000
K4000
H249
K1
K18
Disable adjustment on A/D
conversion curve
3.1.1.9 Applications
„
Measuring Current
1. Description
y
Assume there is an external device that sends an analog current signal of 0mA ~
20mA to the ELC-AN04ANNN module. Then store these values in register D0 for
monitoring the current.
y
Set the input signals of the A/D module to mode 3, i.e. the current input mode (-20mA
~ +20mA).
2. Place the following values from the AN04 module into the following ELC registers:
y
D40: average value of the input signals
y
D50: present value of input signal
y
D0: actual value of the present measured current
3. Wiring
y
Connect the current signal to be measured to CH1 and short-circuit V+ and I+ (as
shown below).
104.7K
250
0mA~+20mA
V+
I+
COM
CH1
104.7K
AG
F G
CH1
Current Input
Shieled cable