WAGO 750-491, Руководство пользователя

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750-491 [1 AI DMS] • 7
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WAGO-I/O-SYSTEM 750
I/O Modules
2 I/O Modules
2.1 Digital Output Modules
2.1.1 750-491 [1 AI DMS]
1-Channel Analog Input Module for Resistor Bridges (DMS)
2.1.1.1 View
+UD +UR
-UD -UR
0V 5V
S S
13 14
C
D
B
A
750-491
+U
ref
Data contacts
Error U
ref
-U
ref
+U (5V)
V
Shield
(screen)
Error U
D
Function U
D
+U
D
Shield
(screen)
-U
D
-U (0V)
V
Function U
ref
+U
ref
+U
V
+U
D
-U
D
-U
ref
-U
V
The power supply Uv can be
obtained from the terminal or
can be feed in external. The
terminal supplies 5 V. The
maximum input voltage U
is limited to10 V.
ref
Fig. 1: 1-Channel Analog Input Module 750-491
g049100e
2.1.1.2 Variations
Item-No. Designation Description
750-491 1 AI DMS 1-Channel Analog Input Module
for Resistor Bridges (DMS)
750-491/000-001 1 AI DMS/65 ms 1-Channel Analog Input Module
for Resistor Bridges (DMS)
2.1.1.3 Description
The analog input module enables the direct connection of a resistor measure-
ment bridge. The brigde voltage U
D
and supply voltage U
ref
of the brigde are
digitised with a resolution of 16 bits.
The input channels for the resistor bridge are available as two 16 bit values for
further processing. The result of measurment can be calculated by the formula:
Measuring value = U
D
/ U
ref